tiu chuán viẻt nam tcvn 6259 -4 : 2003 qui phm phàn cảp vĂ ẵĩng tĂu bièn vị thắp phÃn trang b ẵiẻn Rules for the Classification and Construction of Sea-going Steel Ships Part Electric Installations Chừỗng 1.1 Qui ½Ùnh chung 1.1.1 QUI ‡ÙNH CHUNG Ph−m vi Ÿp dòng Nhùng yÅu c·u ê Ph·n n¡y Ÿp dũng cho thiặt b ẵiẻn vĂ dày dạn dùng trn tĂu thy (sau ẵày gi lĂ "trang b ẵiẻn") õi vối trang b ẵiẻn trn cc tĂu nhị, cc tĂu cĩ vùng hot ẵổng bièn hn chặ vĂ cc tĂu ẵnh c, viẻc p dũng nhựng yu cÃu ca PhÃn nĂy cĩ thè ẵừỡc ng kièm chảp nhn thay ½äi t÷ng ph·n phï hìp vèi nhùng u c·u cða Chừỗng 6, trữ nhựng vản ẵậ cĩ lin quan ẵặn băo vẻ trnh gày tọn thừỗng, chy vĂ cc nguy hièm khc ẵiẻn gày 1.1.2 Thay thặ từỗng ẵừỗng Cĩ thè chảp nhn trang b ẵiẻn khỏng hoĂn to¡n phï hìp vèi nhùng yÅu c·u cða Ph·n n¡y, nặu cĩ lỷ xc ẵng vĂ ẵừỡc ng kièm chảp nhn từỗng ẵừỗng vối nhựng qui ẵnh nu PhÃn nĂy 1.1.3 Trang b ẵiẻn cĩ ẵc ẵièm thiặt kặ kièu mối õi vối trang b ẵiẻn ẵừỡc chặ to hoc lp ẵt cĩ ẵc ẵièm thiặt kặ kièu mối thệ ng kièm cĩ thè chảp thun viẻc p dịng nhùng u c·u thÏch hìp cða Ph·n n¡y tèi mưc cÜ thÌ ½õìc k¿m theo nhùng u c·u bä sung nÅu thiỈt kỈ v¡ qui trƯnh thø khŸc vối yu cÃu ẵơ nu PhÃn nĂy Trong trừộng hỡp nĂy, ng kièm chảp nhn trang b ẵĩ nặu chợng ẵừỡc chửng minh phù hỡp vối mũc ẵẽch sứ dũng vĂ cĩ thè trệ hot ẵổng ca thiặt b ẵổng lỳc vĂ ẵăm băo an toĂn cho ngừội vĂ tĂu ẵặn mửc mĂ ng kièm thảy thịa mơn 1.1.4 TĂu khch Thiặt b ẵiẻn ca tĂu khch phăi phù hỡp vối nhựng yu cÃu ca PhÃn 8F vĂ cc yu cÃu từỗng ửng ca PhÃn nĂy 1.1.5 Thuºt ngù v¡ ‡Ùnh nghØa Trong Ph·n n¡y sø dòng cc thut ngự ẵừỡc ẵnh nghỉa sau ẵày: (1) Vùng nguy hiÌm: L¡ vïng ho´c kháng gian cÜ chưa cŸc chảt d chy hoc d vĂ ẵĩ tữ cc chảt nĂy củng d sinh khẽ hoc hỗi dÍ chŸy ho´c dÍ nä (2) C°t chàn làc: L¡ sỳ bõ trẽ cho chì cĩ thiặt b băo vẻ gÃn ẵièm hịng nhảt ẵừỡc mờ tỳ ẵổng nh±m trƯ ngn cung c¶p n¯ng lõìng cho ph·n cín li ca mch àm xuảt hiẻn hịng mch cĩ cc thiặt b băo vẻ ẵừỡc mc nõi tiặp tcvn 6259 -4 : 2003, Chừỗng (3) C°t õu tiÅn : L¡ sú bâ trÏ cho cc thiặt b băo vẻ cc mch khỏng quan trng ẵừỡc mờ tỳ ẵổng ẵè băo toĂn nguón cảp nng lừỡng cho cc thiặt b quan trng bảt kỹ mổt my pht nĂo b qu tăi hoc từỗng tỳ (4) iậu kiẻn hot ẵổng vĂ sinh hot bệnh thừộng : LĂ ẵiậu kiẻn mĂ ẵĩ tĂu nĩi chung, my mĩc, thiặt b phũc vũ, phừỗng tiẻn vĂ thiặt b trỡ giợp hẻ ẵổng lỳc, khă nng li, hĂng hăi an toĂn, sỳ an toĂn phíng chy v¡ ngºp nõèc, tháng tin tÏn hiỴu nỉi bỉ v¡ bn ngoĂi, cc phừỗng tiẻn thot thàn vĂ tội xuóng sỳ cõ củng nhừ cc ẵiậu kiẻn tiẻn lỡi phũc vị sinh ho−t cho ngõéi l¡m viỴc bƯnh thõéng vĂ ẵợng chửc nng (5) iậu kiẻn sỳ cõ : LĂ ẵiậu kiẻn mĂ ẵĩ tảt că cc thiặt b phũc vũ cÃn thiặt cho ẵiậu kiẻn hot ẵổng v¡ sinh ho−t bƯnh thõéng kháng l¡m viỴc hõ hịng nguón ẵiẻn chẽnh (6) Nguón ẵiẻn chẽnh : LĂ nguón cảp ẵiẻn cho băng ẵiẻn chẽnh ẵè phàn phõi cho tảt că cc thiặt b phũc vũ cÃn thiặt ½Ì trƯ t¡u ê ½iËu kiỴn ho−t ½ỉng v¡ sinh hot bệnh thừộng (7) Trm pht ẵiẻn chẽnh : LĂ khỏng gian mĂ ẵĩ ẵt nguón ẵiẻn chẽnh (8) Băng ẵiẻn chẽnh : LĂ băng ẵiẻn ẵừỡc cảp ẵiẻn trỳc tiặp bng nguón ẵiẻn chẽnh vĂ dùng ẵè phàn phõi ẵiẻn nng cho cc thiặt b phũc vũ tĂu (9) Nguón ẵiẻn sỳ cõ : LĂ nguón ẵiẻn dùng ẵè cảp ẵiẻn cho băng ẵiẻn sỳ cõ mảt nguón ẵiẻn chẽnh (10) Băng ẵiẻn sỳ cõ : LĂ băng ẵiẻn mĂ ẵiậu kiẻn hịng hẻ thõng cảp nguón ẵiẻn chẽnh thệ nĩ ẵừỡc cảp ẵiẻn trỳc tiặp bng nguón ẵiẻn sỳ cõ hoc nguón ẵiẻn sỳ cõ tm thội vĂ dùng ẵè phàn phõi ẵiẻn n¯ng cho cŸc thiỈt bÙ phịc vị sú câ (11) Thiặt b ẵiẻn cĩ kièu hoc cĩ băo vẻ n : LĂ thiặt thiặt b mĂ ẵiậu kiẻn lĂm viẻc bệnh thừộng khỏng thè ẵnh lứa mỏi trừộng khÏ dÍ nä bao quanh v¡ cđng kháng dÍ bÙ hịng ẵnh lứa (12) IEC (International Electrotechnical Commission) : y ban ẵiẻn Quõc tặ 1.1.6 Băn v vĂ cc tĂi liẻu kỵ thut Cc băn v vĂ tĂi liẻu kỵ thut nhừ nu dừối ẵày cÃn phăi ẵừỡc trệnh duyẻt Nặu thảy cÃn thiặt ng kièm cĩ thè yu cÃu trệnh bọ sung cc băn v vĂ cc tĂi liẻu khc ngoĂi cc băn v vĂ tĂi liẻu ẵừa dừối ẵày Băn v : (1) Băn v lp rp chi tiặt cc my pht, ẵổng cỗ vĂ cc khốp nõi ẵiẻn tữ dùng cho thiặt b ẵiẻn chàn vt Trong ẵĩ cĩ ghi rò cỏng suảt, kẽch thõèc chÏnh, vºt liỴu sø dịng chÏnh v¡ tràng lõìng; (2) Sỗ ẵó nguyn lỷ vĂ thuyặt minh cc cỗ cảu ẵiậu khièn thiặt b ẵiẻn chàn vt; (3) Băn vÁ l°p rŸp chi tiỈt cŸc mŸy phŸt (chÏnh, phị, sỳ cõ) cĩ cỏng suảt tữ 100 kW trờ ln (hoc kVA) Trong ẵĩ cĩ ghi rò cỏng suảt, kẽch thừốc chẽnh, vt liẻu ẵừỡc dùng chẽnh vĂ trng lừỡng; (4) Băn v bõ trẽ (trong ẵĩ ghi rò ẵc ẵièm kỵ thut ca cc bổ phn chẽnh nhừ : cŸc bỉ ng°t m−ch, c·u chƯ, dịng cị ½o v¡ cp ẵiẻn) vĂ sỗ ẵó nguyn lỷ ca băng ẵiẻn chẽnh vĂ băng ẵiẻn sỳ cõ; (5) Băn v bõ trẽ thiặt b ẵiẻn vĂ lp ẵt cp ẵiẻn; (6) Sỗ ẵó hẻ thõng ẵi dày Trong ẵĩ ghi rò: díng ẵiẻn lĂm viẻc bệnh thừộng, díng ẵiẻn ẵnh mửc, díng ngn mch cĩ thè xăy mch, sũt p ẵừộng dày, kièu cp ẵiẻn, kẽch thừốc cp ẵiẻn, tr sõ vĂ dăi ẵiậu chình ca cc bổ ngt mch, cc cÃu chệ vĂ cỏng tc, vĂ khă nng ng°t cða cŸc bỉ ng°t m−ch v¡ c·u chƯ T¡i liẻu : (1) Thuyặt minh hẻ thõng ẵiẻn chàn vt ; (2) Băn tẽnh nguón ẵiẻn; (3) Danh mũc chi tiặt thiặt b ẵiẻn p cao (kè că ẵiẻn p thứ ẵổ bận chảt cch ẵiẻn) ; (4) Sỗ ẵó cŸc kháng gian nguy hiÌm v¡ danh mịc cŸc thiỈt b ẵiẻn ẵừỡc lp ẵt ẵĩ (chì p dũng ½âi vèi t¡u d·u, cŸc t¡u chê xá khÏ hÜa lịng vĂ cc tĂu chờ xỏ hĩa chảt nguy hièm) 1.1.7 iậu kiẻn mỏi trừộng Trữ cĩ qui ẵnh khc, yu cÃu phăi p dũng ẵiậu kiẻn mỏi trừộng nhừ nu Băng 4/1.1 vĂ 4/1.2 cho viẻc thiỈt kỈ, lúa chàn v¡ bâ trÏ cŸc trang bÙ ẵiẻn ẵè chợng lĂm viẻc cĩ hiẻu quă Thiặt b ẵiẻn phăi ẵăm băo lĂm viẻc tõt cĩ chản ẵổng xăy lợc chợng ẵang lĂm viẻc bệnh thừộng tcvn 6259 -4 : 2003, Chừỗng Băng 4/1.1 Nhiẻt ẵổ mỏi trừộng Nỗi ẵt, bõ trẽ Trong khỏng gian kẽn ẵặn 45 Trong khỏng gian cĩ nhiẻt ẵổ lốn hỗn 45oC vĂ nhị hỗn 0oC Tùy theo cc ẵiậu kiẻn ca v trẽ cũ thè Trn boong hờ Khỏng khẽ Nhiẻt ẵổ (oC) -25 ẵặn 45 32 Nừốc bièn Băng 4/1.2 Tn thiặt b Cc thiặt b khc vối nu dừối ẵày Cc thiặt b ẵiẻn sỳ cõ, cỗ cảu ẵĩng ngt (cc bổ ngt mch, v.v ), thiặt b ẵiẻn vĂ ẵiẻn tứ GÜc nghiÅng L°c ngang (1) GÜc nghiÅng GÜc nghiÅng tØnh ½æng 150 22,5 22,50 (2) 22,50 (2) L°c dàc (1) GÜc nghiÅng GÜc nghiÅng tØnh ½ỉng 10 7,5 10 0 Chỵ thÏch: (1) L°c dàc, lc ngang cĩ thè xăy ẵóng thội (2) cŸc t¡u chê xá khÏ hÜa lÞng v¡ cŸc t¡u chờ xỏ hĩa chảt nguy hièm, nguón cảp ẵiẻn sỳ cõ phăi vạn cĩ thè hot ẵổng ẵừỡc tĂu bÙ ngºp nõèc vèi gÜc nghiÅng tâi ½a l¡ 300 1.2 Thứ nghiẻm 1.2.1 Thứ ti xừờng Phăi tiặn hĂnh thứ thiặt b ẵiẻn nhừ nu dừối ẵày phù hỡp vối cc yu cÃu từỗng ửng PhÃn nĂy ti xừờng chặ to hoc cc xừờng khc cĩ ẵÃy ẵ thiặt b cho viẻc thứ vĂ kièm tra Tuy nhin, ẵõi vối thiặt b nhừ nu (4) vĂ (5) mĂ cĩ cỏng suảt nhị thệ ng kièm cĩ thè xem xắt giăm mổt phÃn viẻc thứ mổt cŸch thÏch hìp (1) (2) (3) (4) (5) (6) (7) (8) Cc my ẵiẻn quay dùng cho thiặt b ẵiẻn chàn vt vĂ thiặt b ẵiậu khièn chợng Cc my pht ẵiẻn phũc vũ trn tĂu (chẽnh, phũ vĂ sỳ cõ) Cc băng ẵiẻn chẽnh vĂ sỳ cõ Cc ẵổng cỗ dùng cho my phũ nu 1.1.6-1(1) ẵặn (3) PhÃn (sau ẵày gi lĂ "cc ẵổng cỗ cĩ cỏng dũng thiặt yặu") Cc cỗ cảu ẵiậu khièn cc ẵổng cỗ nu (4) Cc biặn p ẵổng lỳc vĂ chiặu sng cĩ cỏng suảt tữ kVA trờ ln ẵõi vối loi pha vĂ tữ kVA trờ ln ẵõi vối loi pha, trừộng hỡp biặn p chì dùng cho ẵn pha qua knh Xuy- thệ vối bảt kỹ cỏng suảt nĂo Cc bổ chình lừu bn dạn ẵổng lỳc cĩ cỏng suảt tữ kW trờ ln vĂ cc thiặt b ẵi km chợng ẵừỡc dùng ẵè cảp nguón cho cc thiặt b ẵiẻn nu (1) ẵặn (5) Cc thiặt b ẵiẻn khc mĂ ng kièm thảy cÃn thiặt õi vối thiặt b ½iỴn ½õìc dïng cho mŸy phị vƯ mịc ½Ïch sø dòng riÅng cða t¡u nhõ nÅu ê 1.1.6-1(4) v¡ (5) PhÃn 3, vĂ ng kièm thảy lĂ cÃn thiặt, thệ chợng củng phăi ẵừỡc thứ phù hỡp vối nhựng yu cÃu từỗng ửng ca PhÃn nĂy õi vối thiặt b ẵiẻn ẵừỡc chặ to hĂng lot, nặu ng kièm ch¶p nhºn, cÜ thÌ Ÿp dịng qui trƯnh thø phï hỡp vối phừỗng php săn xuảt thay cho nhựng yu cÃu nu -1 trn Thiặt b ẵiẻn vĂ cp ẵiẻn nu tữ (1) ẵặn (5) dừối ẵày phăi chu thứ mạu cho mồi kièu săn phám : tcvn 6259 -4 : 2003, Chừỗng (1) (2) (3) (4) (5) C·u chƯ ; CŸc bỉ ng°t m−ch ; Cc cỏng tc tỗ ẵiẻn tữ ; Thiặt b ẵiẻn phíng ; Cp ẵiẻn ẵổng lỳc, chiặu sng vĂ lin lc bổ Thiặt b ẵiẻn vĂ cp ẵiẻn cĩ Giảy chửng nhn nặu ẵừỡc ng kièm xem xắt chảp nhn thệ cĩ thè ẵừỡc giăm mổt ph·n ho´c to¡n bỉ viỴc thø v¡ kiÌm tra 1.2.2 Thứ sau lp ẵt trn tĂu Sau thiặt b ẵiẻn vĂ cp ẵiẻn ẵơ ẵừỡc lp ẵt hoĂn chình trn tĂu thệ chợng phăi ẵừỡc thứ vĂ kièm tra phï hìp vèi nhùng yÅu c·u nÅu ê 2.18 1.2.3 Thø v¡ kiÌm tra bä sung Khi th¶y c·n thiỈt, ‡¯ng kiÌm cÜ thÌ u c·u thø v¡ kiÌm tra khc vối nhựng yu cÃu ẵơ nu PhÃn nĂy 10 tcvn 6259 -4 : 2003, Chừỗng Chừỗng 2.1 Qui ẵnh chung 2.1.1 trang b ẵiẻn vĂ thiặt kặ hẻ thõng Phm vi p dũng Chừỗng nĂy qui ẵnh nhựng yu cÃu ẵõi vối thiặt b ẵiẻn vĂ cp ẵiẻn củng nhừ viẻc thiặt kặ hẻ thõng lin quan ẵặn ẵiẻn 2.1.2 iẻn p vĂ tÃn sõ iẻn p ca hẻ thõng khỏng ẵừỡc vừỡt qu : (1) (2) (3) (4) 500 ván ½âi vèi cŸc my pht ẵiẻn, thiặt b ẵiẻn ẵổng lỳc, thiặt b sừời vĂ nảu n ẵừỡc nõi dày cõ ẵnh ; 250 vỏn ẵõi vối mch chiặu sng, lí sừời ca bin v¡ buãng cáng cæng khŸc vèi nÅu ê (1) ; 15.000 ván xoay chiËu v¡ 1.500 ván mæt chiậu ẵõi vối thiặt b ẵiẻn chàn vt ; 15.000 ván xoay chiËu ½âi vèi cŸc mŸy phŸt xoay chiËu vĂ thiặt b ẵiẻn ẵổng lỳc dùng ẵiẻn xoay chiậu thịa mơn nhựng yu cÃu 2.17 Cho phắp sø dịng t·n sâ 60 h¾c ho´c 50 h¾c ê tảt că cc hẻ thõng ẵiẻn xoay chiậu Thiặt b ẵiẻn ẵừỡc cảp ẵiẻn tữ băng ẵiẻn chẽnh vĂ sỳ cõ phăi ẵừỡc thiặt kặ vĂ chặ to cho chợng cĩ thè hot ẵổng tõt cĩ dao ẵổng ẵiẻn p vĂ tÃn sõ Nặu khỏng cĩ qui ẵnh khc, thiặt b ẵiẻn phăi hot ẵổng tõt ½iỴn Ÿp v¡ t·n sâ dao ½ỉng vèi mưc nhõ nu Băng 4/2.1 Bảt kỹ hẻ thõng ẵc biẻt nĂo, vẽ dũ nhừ: cc mch ẵiẻn tứ mĂ khă nng chợng khỏng thè hot ẵổng tõt giối hn nu Băng nĩi trn thệ phăi cảp ẵiẻn cho chợng bng biẻn php thẽch hỡp (vẽ dũ : bổ ọn p, v.v ) Băng 4/2.1 Giối hn dao ẵổng ½iỴn Ÿp v¡ t·n sâ Gièi h−n dao ½ỉng Tháng sõ dao ẵổng Làu dĂi Tửc thội iẻn p + 6%, -10% ± 20% (1,5 giµy) T·n sâ ± 5% 10% (5 giày) Chợ thẽch : (1) Cc tr sõ (khỏng kè thội gian) Băng nghỉa lĂ tì lẻ phÃn trm so vối gi tr ẵnh mửc (2) Băng 4/2.1 khỏng p dũng cho thiặt b ẵiẻn dùng ẵiẻn c qui 2.1.3 Kặt cảu, vt liẻu, lp ẵt, v.v Cc bổ phn ca my ẵiẻn chu ẵổ bận cỗ hc phăi ẵừỡc lĂm bng vt liẻu khỏng cĩ khuyặt tt Viẻc lp chẽnh xc vĂ khe hờ ca cc bổ phn phăi phù hỡp vối mỏi trừộng bièn Tảt că cc thiặt b phăi ẵừỡc kặt cảu vĂ ẵừỡc lp ẵt cho khỏng gày tọn thừỗng cho ngừội hĂnh ẵũng chm vĂo thiặt b Cc vt liẻu cch ẵiẻn vĂ cc cuổn dày ẵừỡc cch ẵiẻn phăi chu ẵừỡc hỗi ám, khỏng khẽ bièn vĂ hỗi dÃu Cc bu lỏng, cu, chõt, vẽt, cc ẵảu dày, vẽt cảy, lí xo vĂ cc chi tiặt nhị khc phăi ẵừỡc lĂm bng vt liẻu chu n mín hoc phăi ẵừỡc băo vẻ chõng n mín mổt cch thẽch hỡp Tảt că cc cu vĂ cc vẽt dùng ẵè nõi cc phÃn mang ẵiẻn vĂ cc bổ phn lĂm viẻc phăi ẵừỡc hơm chc chn Thiặt b ẵiẻn phăi ½õìc ½´t ê vÙ trÏ dÍ tèi g·n, ê khu vỳc ẵừỡc thỏng giĩ tõt, ẵừỡc chiặu sng ẵ, vĂ nỗi ẵĩ khỏng thè cĩ nguy cỗ b hịng cỗ khẽ hoc nừốc, hỗi hoc dÃu Nặu nhựng nỗi mĂ cĩ nhựng ri ro khỏng thè trnh ẵừỡc thệ thiặt b ẵiẻn phăi cĩ kặt cảu cho phù hỡp vối cc ẵiậu kiẻn ca v trẽ ẵt 11 tcvn 6259 -4 : 2003, Chừỗng Khỏng ẵừỡc phắp ẵt trang b ẵiẻn nhựng nỗi cÜ tÏch tị khÏ dÍ nä ho´c bng ½´t c qui, kho sỗn, kho chửa axtilen hoc cc khỏng gian từỗng tỳ, trữ chợng thịa mơn nhựng yu cÃu tữ (1) ẵặn (4) dừối ẵày : (1) (2) (3) (4) Thiặt b ẵiẻn vĂ cp ẵiẻn phăi ẵừỡc ẵt cho cĩ khoăng cch an toĂn so vối la bĂn tữ hoc phăi ẵừỡc băo vẻ cho ănh hừờng ca tữ trừộng bn ngoĂi ẵừỡc hn chặ ẵặn mửc khỏng ẵng kè că ẵang ẵĩng mch hay mờ mch 2.1.4 Thiặt b ẵiẻn cĩ cỏng dũng thiặt yặu ; Thiặt b ẵiẻn cĩ kiÌu kháng ½Ÿnh løa l¡m chŸy hån hìp liÅn quan ; Thiặt b ẵiẻn phù hỡp vối cc khỏng gian lin quan ; Thiặt b ẵiẻn ẵừỡc chửng nhn phù hỡp cho viẻc sứ dũng an toĂn bũi bán, hỗi dÃu hoc khẽ mĂ nĩ thừộng xuyn phăi tiặp xợc Nõi ẵảt Cc phÃn kim loi ẵè trÃn khỏng mang ẵiẻn ca thiặt b ẵiẻn, mĂ bệnh thừộng khỏng thè cĩ ẵiẻn nhừng hịng cĩ thè trờ thĂnh cĩ ẵiẻn, thệ phăi ẵừỡc nõi ẵảt tin cy, trữ cc trừộng hỡp sau : (1) Chợng ẵừỡc cảp ½iỴn vèi ½iỴn Ÿp kháng quŸ 50 ván dÝng mỉt chiậu hoc 50 vỏn ẵiẻn p dày hiẻu dũng díng xoay chiậu Tuy nhin, khỏng cho phắp dùng biặn p tỳ ngạu ẵè to ẵiẻn p nĂy ; (2) Chợng ẵừỡc cảp ẵiẻn khỏng qu 250 vỏn qua biặn Ÿp cŸch ly an to¡n d¡nh riÅng cho chỵng ; (3) Chợng cĩ kặt cảu cch ẵiẻn kắp CÃn cĩ cc biẻn php an toĂn bọ sung cho thiặt b ẵiẻn xch tay dùng buóng kẽn hoc buóng ám ừốt, nỗi mĂ cĩ thè cĩ cc ri ro ẵc biẻt ẵiẻn Khi cÃn thiặt nõi ẵảt thệ cc dày nõi ẵảt phăi lĂ dày ẵóng hoc dày lĂm bng vt liẻu khc ẵừỡc chảp thun, vĂ nĩ phăi ẵừỡc băo vẻ chõng hịng, cÃn thiặt phăi ẵừỡc sỗn chõng Kẽch thừốc ca cc dày dạn nõi ẵảt phăi ẵừỡc ng kièm thảy phù hỡp vối tiặt diẻn ca cc dày dạn mang ẵiẻn vĂ sỳ lp ẵt ẵừộng dày nõi ẵảt 2.1.5 Khe hờ vĂ khoăng cch cch ẵiẻn Khe hờ vĂ khoăng cch cch ẵiẻn giựa cc phÃn mang ẵiẻn vối vĂ giựa cc phÃn mang ẵiẻn vối phÃn kim loi nõi ẵảt (sau ẵày gi lĂ "khe hờ vĂ khoăng cch cch ẵiẻn") phăi từỗng ửng vối ẵiẻn p lĂm viẻc, cĩ xắt ẵặn băn chảt vĂ ẵiậu kiẻn lĂm viẻc ca vt liẻu cch ẵiẻn Khe hờ vĂ khoăng cch cch ẵiẻn bn hổp ẵảu dày ca cc my ẵiẻn quay, cc dạn băng ẵiẻn vĂ cc thiặt b ẵiậu khièn phăi phù hỡp vối nhựng yu cÃu từỗng ửng ca phÃn nĂy 2.2 Thiặt kặ hẻ thõng - Qui ẵnh chung 2.2.1 Cc hẻ thõng phàn phõi Chì cho phắp sứ dũng cc hẻ thõng phàn phõi sau : (1) (2) (3) (4) (5) Hẻ thõng ẵiẻn mổt chiậu hai dày ; Hẻ thõng ẵiẻn mổt chiậu ba dày (hẻ thõng ba dày cch ẵiẻn hoc hẻ thõng ba dày cĩ trung tẽnh nõi ẵảt) ; Hẻ thõng ẵiẻn xoay chiậu mổt pha hai dày ; Hẻ thõng ẵiẻn xoay chiậu ba pha ba dày ; Hẻ thõng ẵiẻn xoay chiậu ba pha bõn dày Chì cho phắp sứ dũng thàn tĂu lĂm dày dạn cc trừộng hỡp sau : (1) Cc hẻ thõng băo vẻ díng catõt dùng ẵè băo vẻ phẽa ngoĂi thàn tĂu ; (2) Cc hẻ thõng nõi ẵảt giối hn vĂ cũc bổ, vối ẵiậu kiẻn bảt kỹ díng ẵiẻn cĩ thè xuảt hiẻn khỏng ½õìc ch−y trúc tiỈp qua vïng nguy hiÌm ; (3) Hẻ thõng kièm tra cch ẵiẻn, vối ẵiậu kiẻn bảt kỹ trừộng hỡp nĂo díng ẵiẻn khắp kẽn khỏng ½õìc võìt quŸ 30 mA 12 tcvn 6259 -4 : 2003, Chừỗng 2.2.2 Hẻ thõng kièm tra cch ẵiẻn Khi mổt hẻ thõng phàn phõi hoc sỗ cảp hoc thử cảp dùng cho mng ẵổng lỳc, sừời hoc chiặu sng mĂ khỏng ẵừỡc nõi ẵảt thệ phăi dùng thiặt b cĩ thè kièm tra lin tũc ẵổ cch ẵiẻn so vối ẵảt, vĂ nĩ phăi pht tẽn hiẻu bng àm hoc nh sng tr sõ cch ẵiẻn thảp hỗn qui ẵnh 2.2.3 Chnh lẻch díng tăi Sỳ chnh lẻch díng tăi giựa mổt dày dạn phẽa ngoĂi vĂ dày giựa cc băng ẵiẻn, cc băng phàn nhĩm vĂ cc băng phàn phõi khỏng vừỡt qu 15% díng toĂn tăi (cĂng thảp cĂng tõt) Sỳ chnh lẻch díng tăi giựa cc pha cc băng ẵiẻn, cc băng phàn nhĩm vĂ cc băng phàn phõi khỏng ẵừỡc vừỡt qu 15% díng toĂn tăi (cĂng thảp cĂng tõt) 2.2.4 Hẻ sõ ẵóng thội Cc mch ẵiẻn cảp cho tữ hai mch nhnh cuõi trờ ln phăi ẵừỡc tẽnh phù hỡp vối tảt că mi phũ tăi ẵừỡc nõi vĂo, ẵày cĩ thè dùng hẻ sõ ẵóng thội Hẻ sõ ẵóng théi ½õìc nÅu ê -1 cÜ thÌ Ÿp dịng ½Ì tẽnh tiặt diẻn dày dạn vĂ cỏng suảt ca cc cỗ cảu ngt (bao góm cc bổ ngt mch vĂ cŸc cáng t°c) v¡ cŸc c·u chƯ 2.2.5 M−ch c¶p ẵiẻn Cc ẵổng cỗ ẵiẻn cĩ cỏng dũng thiặt yặu yu cÃu bõ trẽ kắp, phăi ẵừỡc cảp ẵiẻn b±ng cŸc m−ch riÅng biỴt kháng dïng v¡o cŸc m−ch cảp chung, cc thiặt b băo vẻ vĂ cc cỗ cảu ẵiậu khièn Cc my phũ buóng my, cc my lĂm hĂng vĂ cc qut thỏng giĩ phăi ẵừỡc cảp ẵiẻn ẵổc lp tữ băng ẵiẻn hoc băng phµn phâi CŸc qu−t tháng giÜ h·m h¡ng v¡ qut thỏng giĩ sinh hot khỏng ẵừỡc phắp cảp ẵiẻn tữ cc mch cảp chung Cc mch chiặu sng vĂ cc mch ẵổng cỗ phăi ẵừỡc cảp ẵiẻn ẵổc lp tữ cc băng ẵiẻn Mch nhnh cuõi cĩ díng lốn hỗn 15 ampe thệ chì ẵừỡc cảp ẵiẻn cho tõi ẵa mổt thiặt b 2.2.6 Mch ẵổng cỗ cỗ cĩ cỏng dũng thiặt yặu vĂ ẵổng cỗ khc cĩ cỏng suảt lốn hỗn hoc bng kW phăi ẵừỡc cảp ẵiẻn bng mch nhnh cuõi ring biẻt 2.2.7 Mch chiặu sng Cc mch chiặu sng phăi ẵừỡc cảp ẵiẻn bng cc mch nhnh cuõi tch biẻt khịi mch thiặt b sừời vĂ thiặt b ẵổng lỳc, trữ qut giĩ cabin vĂ cc thiặt b dùng bổ Sõ ẵièm chiặu sng ẵừỡc cảp ẵiẻn bng m−ch nhŸnh cuâi cÜ dÝng t÷ 15 ampe trê xuâng kháng ½õìc võìt quŸ : 10 ½âi vèi m−ch cÜ ½iỴn Ÿp tèi 50 ván ; 14 ½âi vèi m−ch cĩ ẵiẻn p tữ 51vỏn ẵặn 130 vỏn ; 24 ẵõi vối mch cĩ ẵiẻn p tữ 131 vỏn ẵặn 250 vỏn Trong trừộng hỡp mĂ sõ ẵièm chiặu sng vĂ díng toĂn tăi lĂ khỏng ẵọi thệ cĩ thè cho phắp nõi nhiậu hỗn sõ ẵièm nu trn vĂo mch nhnh cuõi, vối ẵiậu kiẻn díng tăi tọng cổng khỏng vừỡt qu 80% díng ca thiặt b băo vỴ m−ch Trong mỉt m−ch nhŸnh ci cÜ díng nhị hỗn hoc bng 10 am-pe cảp cho chiặu sng băng ẵiẻn vĂ cc tẽn hiẻu ẵiẻn mĂ ½Ü cŸc ½ui ½¿n ½õìc nhÜm tºp trung thƯ sâ ẵièm ẵừỡc cảp ẵiẻn lĂ khỏng hn chặ Trong cŸc kháng gian nhõ buãng bâ trÏ mŸy chÏnh ho´c nói hỗi, cc buóng my lốn, cc nhĂ bặp lốn, h¡nh lang, c·u thang ½i boong t¡u v¡ cŸc buóng cỏng cổng, thệ cc ẵn chiặu sng phăi ẵừỡc cảp ẽt nhảt tữ hai 13 tcvn 6259 -4 : 2003, Chừỗng mch vĂ phăi bõ trẽ cho mỉt m−ch bÙ hõ hÞng thƯ cŸc kháng gian nĂy vạn ẵừỡc chiặu sng Mổt hai mch nĂy cÜ thÌ l¡ m−ch chiỈu sŸng sú câ CŸc mch chiặu sng sỳ cõ phăi phù hỡp vối cc u c·u nÅu ê 3.3 2.2.8 M−ch dïng cho hỴ thõng thỏng tin bổ vĂ hĂng hăi Cc hẻ thõng tẽn hiẻu vĂ thỏng tin bổ thiặt yặu vĂ cc thiặt b phũc vũ hĂng hăi phăi cÜ cŸc m−ch tú giù ½ỉc lºp ho¡n to¡n ½Ì ẵăm băo trệ tõt chửc nng ca chợng tối mửc cĩ thè ẵừỡc Cc cp ẵiẻn dùng cho hẻ thõng thỏng tin phăi ẵừỡc bõ trẽ cho khỏng gày nhiu Khỏng cho phắp bõ trẽ cỏng tc trn cc mch cảp ẵiẻn ca cc thiặt b bo ẵổng chung, trữ cỏng tc nguón chồ cĩ sứ dũng bổ ngt mch thệ phăi cĩ cc biẻn php thẽch hỡp ẵè trnh bổ ngt nm vÙ trÏ "ng°t" 2.2.9 M−ch dïng cho trang bÙ vá tuyặn ẵiẻn Cc mch cảp ẵiẻn cho trang b vỏ tuyặn ẵiẻn phăi ẵừỡc bõ trẽ phù hỡp vối 4.2.2, chừỗng ca TCVN 6278:2003 2.2.10 Mch dùng cho thiặt b sừời vĂ nảu n Mồi mổt thiặt b sừời vĂ nảu n dùng ẵiẻn phăi ẵừỡc nõi vối mch nhnh cuõi ring biẻt, trữ chì tõi ẵa 10 bổ sừời ẵiẻn loi nhị cĩ díng tọng cổng nhị hỗn hoc bng 15 ampe thệ cĩ thè ẵừỡc nõi vối mch nhnh cuõi ẵỗn Thiặt b sừời vĂ nảu n phăi ẵừỡc khõng chặ bng cỏng tc nhiậu cỳc ẵt gÃn thiặt b Tuy nhin, cc bổ sừời ẵiẻn loi nhị ẵừỡc nõi vối mch nhnh cuõi cĩ díng nhị hỗn hoc bng 15 ampe thƯ cÜ thÌ cho ph¾p dïng cáng t°c mỉt cúc ẵè khõng chặ 2.2.11 Mch dùng ẵè nõi ẵiẻn Khi cĩ bõ trẽ dùng nguón ẵiẻn ẵè cảp cho tĂu thệ phăi ẵt hổp nõi v trÏ thÏch hìp Trong trõéng hìp m¡ cŸc cŸp nõi cĩ thè ẵừỡc kắo vĂo băng ẵiẻn d d¡ng v¡ ½õìc ½õa v¡o phịc vị an to¡n thƯ cĩ thè cho phắp bị hổp nõi vối ẵiậu kiẻn phăi trang b cc thiặt b băo vẻ vĂ kièm tra nhừ nu -2 Hổp nõi phăi cĩ cc cc ẵảu dày ẵè to thun tiẻn cho viẻc nõi, vĂ phăi cĩ bổ ngt mch hoc cÃu dao km cÃu chệ Phăi cĩ biẻn php ẵè kièm tra liÅn tịc thư tú pha (vèi dÝng xoay chiËu ba pha) ho´c cúc tÏnh (vèi dÝng mæt chiËu) Trõéng hỡp nguón ẵừỡc cảp tữ hẻ thõng ba dày cĩ trung tẽnh nõi ẵảt thệ phăi bõ trẽ cc nõi ẵảt ẵè nõi vị tĂu vối ẵảt thẽch hỡp, yÅu c·u n¡y bä sung cho næi dung nÅu ê -2 hổp nõi phăi cĩ ghi chợ ẵừa thỏng tin vậ hẻ thõng cung cảp vĂ ẵiẻn p ẵnh mửc ca hẻ thõng (vĂ tÃn sõ nặu lĂ ẵiẻn xoay chiậu) vĂ qui trệnh thỳc hiẻn nõi dày Cp ẵiẻn giựa hổp nõi vĂ băng ẵiẻn phăi ẵừỡc cõ ẵnh chc chn vĂ phăi bõ trẽ ½¿n bŸo nguãn v¡ cáng t°c ho´c bæ ng°t m−ch 2.2.12 Cáng t°c ng°t m−ch CŸc m−ch ½ỉng lúc vĂ chiặu sng ẵi cc hÃm hĂng hoc cc kho chửa than phăi cĩ cỏng tc nhiậu cỳc ẵt ngoĂi cc khỏng gian nĂy Phăi cĩ biẻn php ½Ì cŸch ly ho¡n to¡n cŸc m−ch n¡y v¡ khÜa ch´t vÙ trÏ "ng°t" cða cŸc cáng t°c ho´c hæp cỏng tc Cc mch cảp ẵiẻn cho cc thiặt b ẵt cc vùng nguy hièm phăi cĩ cỏng t°c cŸch ly nhiËu cúc ½´t ê vïng kháng nguy hièm óng thội cc cỏng tc cch ly phăi cĩ nhơn ghi rò rĂng ẵè nhn biặt thiặt b ẵiẻn ½õìc nâi vèi chỵng 14 tcvn 6259 -4 : 2003, Chừỗng 2.2.13 Dững tữ xa cc qut giĩ vĂ bỗm Dững ta xa qut thỏng giĩ vĂ bỗm phăi phù hỡp vối yu cÃu nu 5.2.1-2 vĂ 5.2.2-2 ẵặn -4 ca PhÃn Nặu dùng cÃu chệ ẵè băo vẻ mch dững tữ xa nhừ nu 5.2.1-2 vĂ 5.2.2-2 ẵặn -4 ca PhÃn vĂ mch chì ẵừỡc khắp kẽn hot ẵổng thệ cÃn phăi quan tàm ẵặn viẻc hịng dày chăy 2.3 Thiặt kặ hẻ thõng - Băo vẻ 2.3.1 Qui ẵnh chung Trang b ẵiẻn tĂu thy phăi ẵừỡc băo vẻ qu tăi, kè că ngn mch Cc thiặt b băo vẻ phăi cĩ khă nng phũc vũ lin tũc cc mch khc tối mửc thỳc hiẻn ẵừỡc bng cch ngt m−ch hõ hÞng v¡ lo−i bÞ hÞng hÜc cho hẻ thõng vĂ nguy hièm chy 2.3.2 Băo vẻ qu tăi Cc ẵc tẽnh ct qu díng ca cc bổ ngt mch vĂ cc ẵc tẽnh chăy ca cÃu chệ phăi ẵừỡc lỳa chn phù hỡp, cĩ xem xắt ẵặn khă nng chu nhiẻt ca thiặt b ẵiẻn vĂ cp ẵiẻn mĂ chợng băo vẻ Khỏng cho phắp dùng cÃu chệ cĩ díng lốn hỗn 200 ampe ẵè băo vẻ qu tăi Chì sõ hoc tr sõ ẵt thẽch hỡp ca thiặt b băo vẻ cho mồi mch phăi ẵừỡc chì thừộng xuyn ti v trẽ ca thiặt b băo vẻ, vĂ củng cÃn phăi chì ẵừỡc gi tr díng ẵiẻn chy mồi mch Cc rỗle băo vẻ qu tăi ca cc bổ ng°t m−ch dïng cho cŸc mŸy phŸt v¡ cŸc thiỈt b băo vẻ qu tăi, trữ cc bổ ngt mch dng hổp kẽn, phăi cĩ khă nng chình ẵừỡc tr sâ dÝng ½´t v¡ cŸc ½´c tÏnh trÍ théi gian 2.3.3 Băo vẻ ngn mch Tr sõ díng ct ca bảt kỹ thiặt b băo vẻ nĂo khỏng ẵừỡc nhị hỗn tr sõ lốn nhảt ca díng ngn mch m¡ cÜ thÌ ch−y qua ½iÌm ½´t trang bÙ lợc xăy ngt mch Tr sõ díng chặ t−o cða cŸc bỉ ng°t m−ch ho´c cáng t°c ½õìc dỳ kiặn ẵè cĩ khă nng ẵĩng kẽn mch, xăy ngn mch phăi khỏng nhị hỗn gi tr lốn nhảt ca díng ngn mch ti ẵièm ẵt trang bÙ Vèi dÝng xoay chiËu thƯ giŸ trÙ lèn nh¶t nĂy từỗng ửng vối gi tr díng xung kẽch cho phắp mảt ẵõi xửng cỳc ẵi Trong trừộng hỡp tr sõ díng ct ẵnh mửc hoc că tr sõ díng chặ to ẵnh mửc ca thiặt b băo vẻ ngn mch khỏng phù hỡp vối nhựng yu c·u nÅu ê -1 v¡ -2, thÖ cŸc c·u chÖ v¡ cŸc bæ ng°t m−ch cÜ trÙ sâ c°t kháng nhị hỗn díng ngn mch s xăy phăi ẵừỡc bõ trẽ phẽa nguón cảp ca trang b ẵừỡc băo vẻ ngn mch nĩi trn Cc bổ ngt mch dùng cho my pht khỏng ẵừỡc phắp dùng cho mũc ½Ïch n¡y CŸc bỉ ng°t m−ch ½õìc nâi vèi phÏa tăi phăi khỏng b hịng qu mửc vĂ phăi cĩ khă nng vạn lĂm viẻc ẵừỡc cc trừộng hìp sau : (1) Khi dÝng ng°n m−ch bÙ ng°t bỉ ng°t m−ch ho´c c·u chƯ dú phÝng (2) Khi bổ ngt mch nõi vối phẽa tăi ẵừỡc khắp kÏn b±ng dÝng ng°n m−ch lỵc bỉ ng°t ho´c c·u dú phÝng ng°t dÝng Khi kháng cÜ sâ liẻu chẽnh xc ca my ẵiẻn quay thệ cc díng ngn mch dừối ẵày ti cc cc ẵảu dày my ẵiẻn phăi ẵừỡc coi lĂ tiu chuán Khi cc ẵổng cỗ ẵiẻn lĂ phũ tăi thệ díng ngn mch phăi l¡ täng cŸc dÝng ng°n m−ch cða cŸc mŸy phŸt vĂ díng ngn mch ca cc ẵổng cỗ ẵĩ (1) Hẻ thõng ẵiẻn mổt chiậu 10 lÃn díng ẵnh mửc ½âi vèi cŸc mŸy phŸt ½õìc nâi m−ch thõéng xuyÅn (kè că dỳ trự) lÃn díng ẵnh mửc ẵõi vối cc ẵổng cỗ ẵiẻn lĂm viẻc ẵóng thội (2) Hẻ thõng ẵiẻn xoay chiậu 10 lÃn díng ẵnh mửc ½âi vèi cŸc mŸy phŸt ½õìc nâi m−ch thõéng xuyÅn (kè că dỳ trự) lÃn díng ẵnh mửc ẵõi vối cc ẵổng cỗ ẵiẻn lĂm viẻc ẵóng thội 15 tcvn 6259 -4 : 2003, Chừỗng 2.3.4 Băo vẻ cc mch ẵiẻn Phăi bõ trẽ thiặt b băo vỴ ng°n m−ch ê måi cúc ho´c måi pha cða tảt că cc mch cch ly trữ mch trung tẽnh vĂ dày càn bng Tảt că cc mch cĩ khă nng b qu tăi phăi ẵừỡc bõ trẽ thiặt b băo vẻ qu tăi nhừ chì dừối ẵày : (1) (2) (3) (4) HỴ thâng mỉt chiËu hai dµy ho´c xoay chiËu mỉt pha hai dµy : ẽt nhảt mổt dày hoc mổt pha ; Hẻ thõng mổt chiậu ba dày : că hai dày phẽa ngoĂi Hẻ thõng ba pha ba dày : ẽt nhảt hai pha Hẻ thõng ba pha bõn dày : că ba pha Khỏng cho phắp ẵt cÃu chệ, cỏng tc khỏng tiặp ẵièm hoc bổ ngt mch khỏng tiặp ẵièm dày dạn nõi ẵảt vĂ dày trung tẽnh 2.3.5 Băo vẻ cc my pht ẵiẻn Cc my pht ẵiẻn phăi ẵừỡc băo vẻ ngn mch vĂ qu tăi bng bổ ngt mch nhiậu cỳc cĩ thè ngt ẵừỡc ẵóng thội tảt că cc cỳc cch ly, trừộng hỡp my pht nhị hỗn 50 kW khỏng lĂm viẻc song song thệ cĩ thè ẵừỡc băo vẻ b±ng cáng t°c nhiËu cúc cÜ c·u chƯ ho´c bỉ ngt mch ẵt mồi cỳc cch ly Thiặt b băo vẻ qu tăi phăi phù hỡp vối khă nng chÙu nhiỴt cða mŸy phŸt ‡âi vèi cŸc mŸy pht ẵiẻn chiậu lĂm viẻc song song, ngoĂi yu cÃu -1, phăi cĩ thiặt b băo vẻ díng ½iỴn ngõìc tŸc ½ỉng nhanh trÙ sâ dÝng ½iỴn ngừỡc nm giối hn tữ 2% ẵặn 15% díng ½Ùnh möc cða mŸy phŸt Tuy nhiÅn, yÅu c·u n¡y khỏng p dũng cho díng ẵiẻn ngừỡc ẵừỡc pht tữ phẽa tăi, vẽ dũ : cc ẵổng cỗ tội, v.v ‡âi vèi cŸc mŸy phŸt xoay chiËu l¡m viỴc song song, ngo¡i u c·u nÅu ê -1, phăi cĩ thiặt b băo vẻ cỏng suảt ngừỡc cĩ trÍ théi gian trÙ sâ cáng su¶t ngõìc n±m giối hn tữ 2% ẵặn 15% cỏng suảt toĂn tăi, viẻc lỳa chn vĂ ẵt tr sõ giối h−n trÅn tïy thc v¡o cŸc ½´c tÏnh cða ½ỉng cỗ lai 2.3.6 Giăm bốt tăi è băo vẻ cc my pht ẵiẻn khịi b qu tăi, phăi bõ trẽ cc thiặt b ẵè tỳ ẵổng ngt cc phũ tăi kháng quan tràng Trong trõéng hìp n¡y cÜ thÌ thúc hiẻn ngt bng hoc nhiậu giai ẵon 2.3.7 Băo vẻ cc mch cảp ẵiẻn Cc mch cảp ẵiẻn cho cc băng phàn nhĩm, cc băng phàn phõi, cc nhĩm khời ẵổng ẵổng cỗ vĂ từỗng tỳ phăi ẵừỡc băo vẻ ngn mch bng cc bổ ngt mch nhiậu cúc ho´c c·u chƯ Trõéng hìp sø dịng c·u chệ, phăi cĩ cc cỏng tc phù hỡp vối nhựng u c·u nÅu ê 2.14.3 ½õìc ½´t ê phÏa ngn cða c·u chÖ Måi cúc cŸch ly cða cŸc mch nhnh cuõi phăi ẵừỡc băo vẻ ngn mch vĂ qu tăi bng cc bổ ngt mch hoc cÃu chệ Trừộng hỡp sứ dũng cÃu chệ, phăi cĩ cc cáng t°c phï hìp vèi nhùng yÅu c·u nÅu ê 2.14.3 ẵừỡc ẵt phẽa nguón ca cÃu chệ Băo vẻ cc mch cảp ẵiẻn cho thiặt b li p dòng cŸc yÅu c·u nÅu ê 15.2.7 Ph·n 3 Cc mch cảp ẵiẻn cho cc ẵổng cỗ ẵơ cĩ thiặt b băo vẻ qu tăi thệ chì cÃn cĩ thiặt b băo vẻ ngn mch Trừộng hỡp dùng cc cÃu chệ ẵè băo vẻ cc mch ẵổng cỗ xoay chiậu ba pha, thệ phăi quan tàm ẵặn khă nng mảt pha Trừộng hỡp dùng cc tũ ẵiẻn ẵè kẽch pha thệ yu cÃu phăi cĩ cc thiặt b băo vẻ qu p 2.3.8 Băo vẻ cc biặn p ẵổng lỳc vĂ chiặu sng Cc mch sỗ cảp ca cc biặn p ẵổng lỳc vĂ chiặu sng phăi ẵừỡc băo vẻ ngn mch vĂ qu tăi bng bổ ngt mch nhiậu cỳc hoc cÃu chệ Khi cc biặn p lĂm viẻc song song, thệ phăi cĩ cc thiặt b cch ly ẵt phẽa thư c¶p 16 tcvn 6259-4 : 2003, Chapter Chapter 4.1 General 4.1.1 ADDITIONAL REQUIREMENTS FOR SHIPS CARRYING SPECIAL CARGOES Scope Electrical installations for ships or cargo spaces carrying special cargoes as specified in the following (1) to (4) are to comply with the requirements in this chapter, in addition to the requirements in other relevant chapters in this part: (1) Tankers, ships carrying liquefied gases in bulk and ships carrying dangerous chemicals in bulk (2) Enclosed cargo holds for motor vehicles with fuel in their tanks for their own propulsion and enclosed compartments adjoining an enclosed cargo hold (3) Coal carriers (4) Ships carrying dangerous goods 4.2 Tankers, ships carrying liquefied gases in bulk and ships carrying dangerous chemicals in bulk 4.2.1 General Electrical equipment for tankers, ships carrying liquefied gases in bulk and ships carrying dangerous chemicals in bulk is to comply with all applicable requirements in this part and the requirements in 4.2.2 to 4.2.4 4.2.2 Distribution system Notwithstanding the requirement in 2.2.1-1 , the distribution system is to be one of the following: (1) Two-wire insulated d.c system; (2) Single-phase two-wire insulated a.c system; (3) Three-phase three-wire insulated a.c system Notwithstanding the requirement in -1, a hull return distribution system may be used for the systems listed in 2.2.1-2(1) to (3) Notwithstanding the requirement in -1, an earthed distribution system may be used for the following systems: (1) Intrinsically safe circuits; (2) Power supplies, control circuits and instrumentation circuits where technical or safety reasons preclude the use of a system with no connection to earth, provided the current in the hull is limited to not more than A in both normal and fault conditions; (3) Limited and locally earthed systems, provided that any possible resulting current does not flow directly through any hazardous areas; (4) A.C power networks of 1000 V root mean square (line to line) and over, provided that any possible resulting current does not flow directly through any hazardous areas 4.2.3 Hazardous areas Hazardous areas for tankers intended for the carriage in bulk of liquid cargoes having a flash point not exceeding 60oC other than liquefied gases specified in Part 8D and dangerous chemicals specified in Part 8E, are to follow the requirements in 4.3.2 Hazardous areas for ships carrying liquefied gases in bulk are to follow the requirements in 1.1.5(15), Part 8D Hazardous areas for ships carrying dangerous chemicals in bulk are to follow the requirements in 10.2, Part 8E 4.2.4 Electrical installations in hazardous areas 61 tcvn 6259-4 : 2003, Chapter Electrical installations are not to be installed in hazardous areas unless essential for operational purposes Where installation of electrical installations is unavoidable, it is to comply with the requirements in this 4.2.4 and also to comply with the requirements in 4.3 , Chapter 10, Part 8D or Chapter 10, Part 8E according to ship type Explosion-protected electrical equipment is to be comply with the requirements in 2.16 and to be certified that it is safely usable in the explosive gas atmosphere concerned Electrical measuring, monitoring, control and communication apparatuses are to be of intrinsically safe type Where it is, however, technically impracticable to meet this requirement, electrical equipment of other explosion-protected construction as deemed appropriate by VR may be used as an alternative to category ' ib ' intrinsically safe type electrical equipment Portable lamps are to be of intrinsically safe type, flameproof type or increased safety type with self-contained battery or of air-driven type with pressurized enclosure Switchgears installed in feeder circuits for explosion-protected electrical equipment in hazardous areas are to be provided with an effective means for preventing dangers arising from missoperation, except for the intrinsically safe circuits, in addition to the compliance with the requirements in 2.2.12-2 Aerials and associated riggings are to be sited well clear of gas or vapour outlets As a rule, no portable electrical equipment is to be located in hazardous areas Where it is unavoidable to locate the equipment in hazardous areas, it is subject to the approval of VR Cables are to be one of the following Where corrosion may be expected, a PVC or chroloprene sheath is to be applied over armour or metallic sheath of cables for corrosion protection (1) Mineral insulated and copper sheathed (2) Lead alloy sheathed and metal armoured (3) Non-metallic sheathed and metal armoured Installation of cables is to comply with the following: (1) Cables are to be installed as close to the hull centre line as practicable (2) Cables are to be installed sufficiently distant from decks, bulkheads, tanks and various kinds of pipes (3) Cables are, as a rule, to be protected against mechanical damage Futher, the cables and their supports are to be fitted in such a manner as to withstand expansion and construction and other effects of the hull structure (4) The penetration part of the cables or cable pipes through decks and bulkheads of the hazardous areas is to be constructed so as to maintain gas-tightness and liquid-tightness as the case may require (5) When mineral insulated cables are used, special precautions are to be taken to ensure sound terminations 10 Metallic protective coverings of power and lighting cables passing through hazardous areas, or connected to equipment installed in such areas, are to be earthed at least at each end 4.3 Tankers intended for the carriage in bulk of liquid cargoes having a flash point not exceeding 60oC other than liquefied gases specified in Part 8D and dangerous chemicals specified in Part 8E 4.3.1 General Electrical installations of tankers intended for the carriage in bulk of liquid cargoes having a flash point not exceeding 60oC other than liquefied gases specified in Part 8D and dangerous chemicals specified in Part 8E are to comply with the requirements in 4.3.2 to 4.3.7 in addition to the requirements in 4.2 4.3.2 Hazardous areas The following areas and spaces are to be considered as a hazardous area: (1) Cargo tanks and cargo piping; (2) Cofferdams and segregated ballast tanks adjacent to cargo tanks 62 tcvn 6259-4 : 2003, Chapter (3) Cargo pump rooms; (4) Enclosed or semi-enclosed spaces immediately above cargo tanks (for example, between decks) or having bulkheads above and in line with cargo tank bulkheads; (5) Enclosed or semi-enclosed spaces immediately above cargo pump rooms or above vertical cofferdams or segregated ballast tanks adjacent to cargo tanks unless separated by a gastight deck and suitably mechanically ventilated; (6) Compartments for cargo hoses: (7) Enclosed or semi-enclosed spaces in which a cargo pipe is fitted; (8) Spaces, other than cofferdams and segregated ballast tanks, adjacent to and below the top of a cargo tank for example, trunks, passage-ways and holds); (9) Areas on open deck or semi-enclosed spaces on open deck, within m of any cargo tank outlet, gas or vapour outlet, cargo manifold valve, cargo valve, cargo pipe flange, cargo pump room entrance or cargo pump room ventilation opening; (10) Areas on open deck within spillage coamings surrounding cargo manifold valves and m beyond these and other coamings intended to keep spillages clear of accommodation and service spaces, up to a height of 2.4 m above the deck; (11) Areas on open deck or semi-enclosed spaces on open deck within m of any ventilation opening of a cargo tank; (12) Areas on open deck over all cargo tanks (including all ballast tanks within the cargo tank block) and to the full breadth of the ship plus m fore and aft on open deck, up to a height of 2.4 m above the deck; (13) Areas on open deck or semi-enclosed spaces on open deck within m of any cargo tank outlet, or gas or vapour outlet and those downward from there to the deck except those within m of the outlet concerned; (14) Areas on open deck or semi-enclosed spaces on open deck within 10 m of any cargo tank ventilation outlet and those downward from there to the deck except those within m of the opening concerned; (15) Enclosed or semi-enclosed spaces having a direct opening into any of the hazardous areas specified in the above 4.3.3 Electrical installations in hazardous areas Category ' ia ' intrinsically safe type electrical equipment and associated cables may be installed in any hazardous area specified in 4.3.2 Electrical installations in hazardous areas specified in 4.3.2(2) are to be as follows: (1) Transducers of navigation instruments such as electric depth sounding devices and associated cables may be installed The transducers are to be of totally enclosed type and to be housed in a gastight enclosure clear of a cargo tank Cables to the transducers are to be installed in heavy gauge galvanized steel pipes with gastight joints up to the main deck (2) Anodes or electrodes of an impressed current cathodic protection system (for external hull protection only) and associated cables may be installed In this case, as for the anodes or electrodes and cables, the requirements in (1) are to apply Electrical installations in hazardous areas specified in 4.3.2(3) are to be as follows: (1) Electrical installations specified in -2 may be installed; (2) Category ' ib ' intrinsically safe type electrical equipment and associated cables may be installed; (3) Lighting fittings of flameproof type or pressurized type and associated cables may be installed The lighting fittings are to be arranged on at least two independent circuits; (4) Audible indicators for general alarm and fire alarm of flameproof type or pressurized type and associated cables may be installed; 63 tcvn 6259-4 : 2003, Chapter (5) Cables may be run through cargo pump room entrances provided that they are installed in heavy gauge steel pipes or steel ducts with gastight joints Electrical installations in hazardous areas specified in 4.3.2(4) are to be as follows: (1) Category ' ib ' intrinsically safe type electrical equipment and associated cables may be installed; (2) Lighting fittings of flameproof type or pressurized type and associated cables may be installed The lighting fittings are to be arranged on at least two independent circuits Where, however, the space is small enough, one circuit may be accepted; (3) Cables may be run through the areas; (4) Electrical installations other than those specified in (1) to (3) may be installed provided that following precautions are taken: (a) Electrical equipment is installed in a suitably mechanically ventilated compartment; (b) Access to the compartment is solely made from the deck above; (c) The floor of the compartment is separated from the cargo tanks by a cofferdam Electrical installations in hazardous areas specified in 4.3.2(5) and (6) are to be as follows: (1) Category ' ib ' intrinsically safe type electrical equipment and associated cables may be installed; (2) Lighting fittings of flameproof type or pressurized type and associated cables may be installed The lighting fittings are to be arranged on at least two independent circuits Where, however, the space is small enough, one circuit may be accepted; (3) Cables may be run through the areas Electrical installations in hazardous areas specified in 4.3.2(7) are to be as follows: (1) Electrical installations specified in -2 may be installed; (2) Electrical installations in the following may be installed provided that the area is suitably mechanically ventilated: (a) Category ' ib ' intrinsically safe type electrical equipment and associated cables; (b) Lighting fittings of flameproof type or pressurized type and associated cables The lighting fittings are to be arranged on at least two independent circuits Where, however, the space is small enough, one circuit may be accepted; (c) Through run cables Electrical installations in hazardous areas specified in 4.3.2(8) are to be as follows: (1) Electrical installations specified in -2 may be installed; (2) Category ' ib ' intrinsically safe type electrical equipment and associated cables may be installed; (3) Lighting fittings of flameproof type or pressurized type and associated cables may be installed The lighting fittings are to be arranged on at least two independent circuits; (4) Audible indicators for general alarm and fire alarm of flameproof type or pressurized type and associated cables may be installed; (5) Cables may be run through the areas provided that they are installed in heavy gauge steel pipes or steel ducts with gastight joints Electrical installations in hazardous areas specified in 4.3.2(9) , (10) , (11) and (12) are to be as follows: (1) Electrical installations specified in -2 may be installed; (2) Electrical equipment of flameproof type, pressurized type or increased-safety type and associated cables may be installed; (3) Cables may be run through the areas However no cable expansion bends are to be provided in the areas specified in 4.3.2(9) and (10) as far as practicable; Electrical installations in hazardous areas specified in 4.3.2(13) and (14) are to be as follows: (1) Electrical installations specified in -8 may be installed; 64 tcvn 6259-4 : 2003, Chapter (2) Electrical equipment with type of protections 'n' and associated cables may be installed; (3) Electrical equipment of the type which ensures the absence of sparks or arcs and no part of such equipment has an operating temperature which can cause the ignition of gases or vapours of the cargoes to be carried, and associated cables may be installed 10 Where electrical installations are provided in hazardous areas specified in 4.3.2(15) , these areas are to be considered as equivalent to the adjacent hazardous areas having direct openings, and the electrical installations are to be in compliance with the corresponding requirements in -1 to -9 4.3.4 Electric motors driving equipment in cargo pump room Electric motors driving equipment located in cargo pump room (for example, cargo pumps, ballast pumps and ventilating fans) are to be installed in the space partitioned from these spaces by gastight bulkheads and decks In addition, suitable stuffing boxes are to be fitted where shafts pass through the bulkheads and decks 4.3.5 Lighting in hazardous areas Where hazardous areas are lit by the lighting fittings located in the adjacent non-hazardous areas through glazed ports fitted in the bulkheads or decks, these glazed ports are to be so constructed as not to impair the water-tight, gastight and strength integrity of the bulkheads and decks Due consideration is to be given to the ventilation of the lighting fittings so that the excessive temperature rise is not caused on the glazed ports 4.3.6 Electric motors driving ventilators for hazardous areas Electric motors driving a fan for the ventilating system of enclosed or semi-enclosed spaces in hazardous areas are to be placed outside the ventilating duct Where, however, deemed appropriate by VR, electric motors driving a fan for the ventilating system of spaces except cargo pump rooms may be placed inside the ventilating duct 4.3.7 Explosion-protected electrical equipment Explosion-protected electrical equipment in dangerous spaces specified in 4.3.2 is to be suitable for use in the explosion gas atmosphere classified into gases and vapours group IIB and temperature class T3 as specified in IEC Publication 60079, or equivalent thereto 4.4 Enclosed cargo holds for carrying motor vehicles with fuel in their tanks for their own propulsion and enclosed compartments adjoining enclosed cargo holds, etc 4.4.1 Electrical installations in enclosed cargo holds, etc Enclosed cargo holds for carrying motor vehicles with fuel in their tanks for their own propulsion, etc are to comply with requirements in 20.3, Part 4.5 Coal carriers 4.5.1 Electrical installations in cargo holds Electrical installations are not to be installed in spaces or areas listed in the following (1) to (3) unless essential for operational purposes: (1) Cargo holds (2) Enclosed spaces adjacent to a cargo hold having a non gastight or watertight door, hatch, and the like into the cargo hold (3) Areas within m of any cargo hold mechanical exhaust ventilation outlet Where installation of electrical installations in such spaces is unavoidable, it is to comply with requirements in the following (1) to (3): 65 tcvn 6259-4 : 2003, Chapter (1) Electrical installations are to be of explosion-protected type as deemed appropriate by VR and to have an enclosure for safely operation in coal dust And electrical installations are to be installed so as to be kept free from mechanical damage However, electrical installations suitable for the location and the purpose of service and considered by VR equivalent with regard to the safety to explosion-protected type electrical installations may be used (2) Switches and soket-outlets are not to be installed except those connected to intrinsically safe circuits (3) The cables passing through the cargo holds are to be led in gastight heavy gauge steel pipes, and the both ends of the pipes are to be sealed using cable glands and the like in way of the boundaries of cargo holds Notwithstanding the requirements in -1 and -2 , electrical installations installed in spaces and areas listed in 1(1) to (3) of a bulk carrier which sometimes carries coal and they are not used during coal carrying are to comply with requirements in the following (1) and (2) : (1) Electrical equipment is to have an enclosure less liable to permit the ingress of coal dust (2) Electrical installations are to be installed so as to be kept free from mechanical damage In addition, feeder circuits for the equipment are to be provided with multipole linked switch situated outside the spaces or areas specified in -1(1) to (3) and accesible, so devised as to have the equipment usually locked with the switch in “off ” position 4.6 Special requirements for ships carrying dangerous goods 4.6.1 General Electrical installations for ships carrying dangerous goods are to comply with the requirements in Chapter 19, Part as well as the relevant requirements in this Part 66 tcvn 6259-4 : 2003, Chapter Chapter 5.1 General 5.1.1 ADDITIONAL REQUIREMENTS FOR ELECTRIC PROPULSION PLANTS Scope Electrical installations for ships which rely solely on propulsion motors for their propulsion (hereinafter referred to as electric propulsion ships in this chapter) are to meet the relevant requirements specified in this part, and in addition to those in this chapter Semiconductor convertors for propulsion motors are to be complied with the requirements of -1 and those as deemed necessary by VR Machinery for electric propulsion ships is to meet the relevant requirements in Part 3, and in addition to those in this chapter 5.1.2 Additional requirements for the prime movers driving propulsion generators When manoeuvring from propeller speed ahead to astern with the ship making ahead, the prime mover driving a propulsion generator is generally to provide a control system being capable of absorbing or limiting the regenerated power without tripping of overspeed protection devices specified in 2.4.1-2 , 3.3.1-1 or 4.3.1-1, Part Further, the prime mover and the generator are to be so constructed to withstand the revolution up to the setting revolution of the overspeed protection devices Characteristics of governors on the prime movers are to be as deemed appropriate by VR, excluding the case where the propulsion generator is also used as a main generator When engine speeds are regulated to control the propeller speed, the governors are to be capable of being controlled remotely, as well as locally However, when deemed appropriate by VR, these requirements not apply When d.c generators to be separately driven are connected in series electrically, means are to be provided to prevent reverse running of the generator in the event of failure of driving power 5.2 Propulsion electrical equipment and cables 5.2.1 General Excessive electromagnetic interference of propulsion electrical equipment is not observed at any normal manoeuvring 5.2.2 General requirements for propulsion motors Propulsion motors are to have performance specified in the following (1) to (3): (1) Torque available for manoeuvring a ship is to be capable of stopping or reversing of the ship in a reasonable time when the ship is running at maximum service speed (2) Adequate torque margin is to be provided in a.c propulsion systems to guard against the motor to be pulled out of synchronism during rough weather and at the time of turning operation in a multiple-screw ship (3) Motors are not to produce any harmful torsional vibration within a normal range of rotational speeds Lubrication of the bearings of propulsion motors is to be effective at all operational speed including creep speed When a forced lubrication system is used, the system is to be provided with alarm devices which give visible and audible alarming in the event of failure of lublicating oil supply or appreciable reduction in lubricating oil pressure, and also with devices to stop the operation of the motors automatically by lower pressure after the function of the alarm 67 tcvn 6259-4 : 2003, Chapter 5 For d.c motors liable to over the speed specified in 2.4.7 due to propeller missing or propeller racing, overspeed protection devices are to be provided, and the rotors are to be suitably constructed to prevent damage due to excessive overspeed Where arrangements permit a propulsion motor to be connected to the generating plant having a continuous rating greater than the motor rating, means are to be provided to prevent continuous operation at the overload or overtorque conditions not permitted to the motors and shaftings The propulsion motor shaft is to conform to the requirements in 2.4.11 In this case, the diameter of the rotor shaft in the length from the section where rotor is fixed to the shaft end of propeller side is to conform to the requirements in 2.4.11-3(1) The value of F1 is to comply with the value specified either in (1) or (2) below (1) When the motor has bearings at both ends: (2) When the motor has no bearings at its propeller side : 5.2.3 110 120 Construction and arrangement of propulsion rotating machines Means are to be provided to prevent the accumulation of bilgewater under the propulsion motors, the generators, the exciters or the electromagnetic slip-couplings (hereinafter referred to as the propulsion rotating machines in this chapter) Slip rings and commutators of propulsion rotating machines are to be suitably arranged to be maintained easily For purpose of inspection and repair is to be made for easy access to each kind of coils and bearing When VR considers necessary, the propulsion rotating machines are to have construction that permits removal and replacement of their field windings Temperature sensors for monitoring and alarming are to be provided for a stator winding of a.c machines or a interpole winding of d.c machines with exceed 500 kW Propulsion rotating machines provided with forced ventilation systems, air ducts or air filters are to have thermometers for measuring cooling air temperatures Effective means are to be provided in rotating machines to prevent accumulation of moisture and condensation 5.2.4 Temperature rise of rotating machines When variable speed propulsion rotating machines are fitted with an integral fan and have to be operated at speeds below the rated speed with full-load torque, full-load current, full-load excitation or the like, temperature limits according to Table 4/ 2.2 of 2.4.3 are not exceeded 5.2.5 68 Semiconductor convertors The semiconductor convertor is to be designed to withstand an overcurrent which may be generated during the turning motion of a ship and under the manoeuvring conditions specified in 1.3.2, Part When semiconductor elements are connected in series or in parallel, an equal voltage or current distribution are to be ensured An effective cooling device is to be provided for maintaining the temperature rise of semiconductor elements or semiconductor stacks below an allowable level Forced ventilated semiconductor elements are to be arranged in such a way that the semiconductor convertors may reduce its output in the event of failure of the ventilating fan, or when a plurality of semiconductor elements are connected in parallel and ventilating fans are provided for individual groups, the elements of the group concerned can be separated from others Forced ventilated semiconductor convertor are to be provided with thermometers for measuring cooling air temperatures Effective means are to be provided in semiconductor convertor to prevent accumulation of moisture and condensation unless the semiconductor converters are situated in an air-conditioned space Over voltages in a supply system to which semiconductor convertors are connected are to be limited by suitable devices to prevent damage Semiconductor elements and filter circuits are to be protected by fuses etc as deemed appropriate by VR tcvn 6259-4 : 2003, Chapter 5.2.6 Cables Conductors of cables for controlgear and instrumentation, which are connected directly with a main circuit are to have or more strands, with a cross-sectional area of 1.5 mm2 or more 5.2.7 Measuring instruments Measuring instruments specified (1) to (4) below are to be installed on the control panel of propulsion motors or in other appropriate places in addition to those specified in Table 4/2.8 of 2.5.6 or Table 4/2.9 of 2.5.7 : (1) Temperature indicator for interpole windings or stator windings of rotating machines for propulsion (only where output exceeds 500 kW ); (2) Voltmeters for motors; (3) Ammeters for field currents and armature in the case of d.c motors; (4) Ammeters for main circuits in the case of a.c motors 5.3 Composition of electrical equipment for propulsion and electrical power supply circuits 5.3.1 Composition of electrical equipment for propulsion and auxiliary machinery for propulsion Means are to be provided to ensure that the installation or equipment mentioned in the following (1) to (6) are to be capable of starting the propulsion motors and obtaining a navigable speed for the ship even though one of those becomes inoperative: (1) The source of electrical power for propulsion; (2) Transformers for propulsion; (3) Semiconductor convertors (including exciters of propulsion motors); (4) Cooling system of propulsion motors; (5) Lubricating system of propulsion motors; (6) Other installations and equipment which VR deems necessary Where the source of electrical power for propulsion correspond to (1) and (2) below, they may be used for the main source of electrical power specified in 3.2.1 (1) When one set of the source of electrical power for propulsion is out of operation, the capacity specified in 3.2.1-2 is secured by the remaining the source of electrical power for propulsion, which at the same time has a capacity sufficient to give a navigable speed for the ship (2) At the time of load fluctuations and braking of the propeller or at the time of changing the rotational speed of the propulsion generator in order to control the propulsion motors, the variations of the voltage and frequency are to comply with the requirements in 2.1.2-3 5.3.2 Electrical power supply circuits Electrical equipment or installations, in duplicate, in accordance with the requirements in 5.3.1-1 are to be supplied with electrical power by mutually independent circuits Propulsion system having two or more generators or motors respectively on one propeller shaft, is to be so arranged that any unit of them can be taken out of service and isolated electrically Safety measures specified in the following (1) to (6) are to be taken for the electrical power supply circuits: (1) Overcurrent protective devices, if any, in the main circuits are to be sufficiently high so that there is no possibility of their operating due to overcurrent caused by manoeuvring condition in rough weather, turning operation or the operation specified in 1.3.2, Part (2) Means for earth leakage detection are to be installed on the electrical power supply circuit to the propulsion motor 69 tcvn 6259-4 : 2003, Chapter (3) Excluding a brushless exciting circuit and an exciting circuit of a rotating machine of less than 500 kW, an earth leakage detection is to be installed at an insulated exciting circuit (4) For propulsion motors or propulsion generators, means are to be provided to enable them to have selective tripping or quick reduction in their field magnetic flux to safeguard against the occurrence of overload current on the main circuits (5) Field circuits are to be provided with means of suppressing voltage rise when the field switch is opened (6) In excitation circuits, there is to be no overload protection causing the openning of the circuits 5.4 Trials After electrical propulsion plants are installed on board ship, sea trial is to be carried out in accordance with the test procedures as deemed appropriate by VR 70 tcvn 6259-4 : 2003, Chapter Chapter 6.1 General 6.1.1 SPECIAL REQUIREMENTS FOR SHIPS WITH RESTRICTED SERVICE, SMALL SHIPS AND FISHING VESSELS Scope The requirements in this chapter apply to electrical installations of ships or vessels listed below in place of the relevant requirements of this part (1) Ships with class notations " restricted III" which are not engaged in international voyage and ships with such a class notation with a gross tonnage less than 500 tons which are engaged in international voyages (2) Ships with a gross tonnage less than 500 tons; (3) Ships with class notations " restricted III " with a gross tonnage of 500 tons or more which are engaged in international voyages; (4) Ships with a gross tonnage of 500 tons or more which are not engaged in international voyage; (5) Fishing vessels which are not engaged in international voyages; (6) Fishing vessels with a gross tonnage less than 500 tons which are engaged in international voyages; (7) Fishing vessels with a gross tonnage of 500 tons or more which are engaged in international voyages 6.2 Electrical installations of ships specified in 6.1.1(1) 6.2.1 General For ships specified in 6.1.1(1) , the requirements of this 6.2.2 to 6.2.20 may be applied 6.2.2 Ambient conditions In Table 4/1.1 of 1.1.7 , air temperature of 40oC and sea water temperature of 27oC may be applied in place of air temperature of 45oC and sea water temperature of 32oC except for ships which are navigating tropical areas 6.2.3 Distribution systems The requirements of 2.2.1-2 may not apply to ships with a gross tonnage less than 1600 tons (except tankers, carriers of liquefied gases in bulk and carriers of dangerous chemicals in bulk) 6.2.4 Insulation monitoring system In applying the requirements of 2.2.2, insulation monitoring system may be replaced with other earth indicating systems for ships with a gross tonnage less than 1600 tons (except tankers, carriers of liquefied gases in bulk and carriers of dangerous chemicals in bulk) 6.2.5 Lighting circuits In 2.2.7-4 , the requirements that in spaces such as compartments where the main propulsion machinery or boilers are provided, large machinery rooms, large galleys, corridors, stairways leading to boat decks and public rooms, lighting is to be supplied from at least two circuits may be limited to spaces where the main propulsion machinery or boilers are provided Further, one of circuits may be reserve lighting circuit 6.2.6 Construction and materials of main switchboard The requirements of 2.5.3-1 may not apply 71 tcvn 6259-4 : 2003, Chapter The requirements of 2.5.3-2 may not apply except ships intended to be registered as ships provided with operation systems to be unattended machinery spaces according to Rules for automatic and remote control systems (hereinafter referred to as M0 ships in this chapter 6.2.7 Measuring instruments for D.C generator In 2.5.6 , in case where there are two or more d.c generators which are not operated in parallel, one ammeter and one voltmeter may be permitted provided that one portable voltmeter and one portable ammeter specified in 3.8.2 are located on board 6.2.8 Measuring instruments for A.C generator In 2.5.7 , in case where there are two or more a.c generators which are not operated in parallel, one ammeter and one voltmeter may be permitted provided that one portable voltmeter and one portable ammeter specified in 3.8.2 are located on board 6.2.9 Controlgears for motors The requirements of 2.8.1-7 and -8 may not apply However, for ships with a gross tonnage of 500 tons or more, a grouped starter panel is to be divided into two parts, i.e one part for no.1 motors and the other part for no.2 motors 6.2.10 Precaution against fire The requirements of 2.9.11 may not apply 6.2.11 Main source of electrical power Notwithstanding the requirements of 3.2.1-1 , except M0 ships, the number of main source of electrical power may be made one However, in case where no other generator is provided, accumulator batteries with a capacity sufficient to supply electrical power to the lighting system, signalling system, communication equipment, etc., which are necessary for ensuring the safety are to be provided as a reserve source of electrical power In M0 ships, the requirements for minimum comfortable conditions of habitability specified in 3.2.1-2 may not apply The requirements of 3.2.1-3 may not apply except M0 ships 6.2.12 Number of transformers In ships other than M0 ships, if an emergency source of electrical power or a reserve source of electrical power (accumulator batteries) is provided in a capacity sufficient to feed the lighting system, signalling system, communication system, etc., the requirements of 3.2.2 may not apply 6.2.13 Lighting systems The requirements of 3.2.3-2 and -4 may not apply Further, in applying the requirements of 3.2.3-3 the ships are to be provided with reserve lighting systems at the following places: (1) Launching station of life rafts and outboard side in the vicinity; (2) All corridors, stairs and exits; (3) Machinery space and the place where the reserve source of electrical power is installed; (4) Control station of main engine 6.2.14 Location of main switchboard The requirements of 3.2.4 may not apply 72 tcvn 6259-4 : 2003, Chapter 6.2.15 Emergency source of electrical power The requirements of 3.3 may not apply 6.2.16 Starting arrangement for emergency generating sets The requirements of 3.4 may not apply 6.2.17 Power supply to navigation lights Notwithstanding the requirements of 3.6.1-3 , power feeding to a navigation light indicator panel is to be supplied by a separate circuit from a main switchboard and a reserve source of electrical power or a lighting distribution panel provided on the navigation bridge (limited to the case where two or more generating sets are provided) However, for ships with a gross tonnage less than 500 tons, only one circuit from the main switchboard supplied from the main source of electrical power and the reserve source of electrical power may be accepted 6.2.18 Power supply to not under command lights, anchor lights and signalling lights Notwithstanding the requirements of 3.6.2 and 3.6.3 , the power supply to not under command lights, anchor lights and signalling lights may be from a main source of electrical power and an independent reserve source of electrical power 6.2.19 Power supply to general alarm systems Notwithstanding the requirements of 3.6.4, the emergency source of electrical power may be of an independent reserve source of electrical power 6.2.20 Spare parts The requirements of 3.8.1-4 may not apply to ships which have an effective manually operated auxiliary steering gear 6.3 Electrical installations of ships specified in 6.1.1(2) 6.3.1 General For ships specified in 6.1.1(2) , the requirements of 6.2.3 to 6.2.6, 6.2.10, 6.2.11-3, 6.2.13, 6.2.14, 6.2.16, 6.2.18 and 6.2.19, and additionally the following requirements from 6.3.2 to 6.3.5 may be complied with 6.3.2 Control gears for motors The requirements of 2.8.1-7 and -8 may not apply 6.3.3 Main source of electrical power The requirements for minimum comfortable conditions of habitability specified in 3.2.1-2 may not apply In the requirements of 3.2.1-3 , the reliability of the ship's main source of electrical power may be modified for ships other than M0 ships 6.3.4 Emergency source of electrical power The requirements of 3.3 may not apply However, that a reserve source of electrical power simultaneously to the following loads at least for hours (continuously 30 minutes for signalling equipment and alarming devices of intermittent services) is to be provided (1) All internal communications required in an emergency; (2) Navigation lights, not under command lights, anchor lights and signalling lights; (3) The lighting systems at locations indicated in 6.2.13 73 tcvn 6259-4 : 2003, Chapter 6.3.5 Power supply to navigation lights Notwithstanding the requirements of 3.6.1-3, power feeding to a navigation light indicator panel may be supplied by one circuit from a main switchboard supplied from a main source of electrical power and a reserve source of electrical power 6.4 Electrical installations of ships specified in 6.1.1(3) 6.4.1 General For ships specified in 6.1.1(3), the requirements of 6.2.2, 6.2.3, 6.2.7 to 6.2.9 and 6.2.20, and additionally the following requirements in 6.4.2 may be complied with 6.4.2 Capacity of emergency source of power The requirements of 3.3.2-2(8) may be complied with 6.5 Electrical installations of ships specified in 6.1.1(4) 6.5.1 General For ships specified in 6.1.1(4), the requirements of 6.2.4, 6.2.5, 6.2.10, 6.2.14 and 6.3.3 may be complied with 6.6 Electrical installations of vessels specified in 6.1.1(5) 6.6.1 General For vessels specified in 6.1.1(5), the requirements of 6.2.2 to 6.2.20 may be complied with 6.7 Electrical installations of vessels specified in 6.1.1(6) 6.7.1 General For vessels specified in 6.1.1(6) , the requirements of 6.2.3 to 6.2.8, 6.2.10, 6.2.11-3, 6.2.14, 6.2.16, 6.2.18, 6.2.19, 6.3.2, 6.3.3-1 and 6.3.5, and additionally the following requirements may be complied with 6.7.2 Main source of electrical power The requirements of 3.2.1-3 and -4 may not apply to a generating set driven by main propulsion machinery as one of two generating sets consisting main source of electrical power of ships other than M0 ships 6.7.3 Lighting systems The requirements of 3.2.3-2 and -4 may not apply Further, in applying the requirements of 3.2.3-3 the vessels are to be provided with reserve lighting systems at the following places: (1) Launching station of life rafts and outboard side in the vicinity; (2) All corridors, stairs and exits; (3 Machinery space and the place where the reserve source of electrical power is installed; (4) Control station of main engine; (5) Spaces where the catch are processed 6.7.4 Emergency source of electrical power The requirements of 3.3 may not apply However, that a reserve source of electrical power simultaneously to the following loads at least for hours (continuously 30 minutes for signalling equipment and alarming devices of intermittent services) is to be provided 74 tcvn 6259-4 : 2003, Chapter (1) All internal communications required in an emergency; (2) Navigation lights, not under command lights, anchor lights and signalling lights; (3) The lighting systems at locations indicated in 6.7.3 6.8 Electrical installations of vessels specified in 6.1.1(7) 6.8.1 General For vessels specified in 6.1.1(7), the requirements of 6.2.5, 6.2.7 to 6.2.9 and 6.7.2, and additionally the following requirements may be complied with 6.8.2 Emergency source of electrical power In applying the requirements of 3.3.2-2 , the following requirements may apply in place of the requirements of 3.3.2-2(1) to (8) (1) For a period of hours , the emergency lighting specified in 3.2.3-3; (2) For a period of hours , the navigation lights and other lights required by the International Regulation for Preventing Collisions at Sea in force and lights required by National Regulations of the country to which the ship is registered (3) For a period of 30 minutes (continuous operation), the signalling lights and the ship's whistle 75 ... lỳc 2.17 Trang b ẵiẻn Ÿp cao 2.17.1 Qui ½Ùnh chung Nhùng yÅu c·u 2.17 n¡y ½õìc Ÿp dịng cho cŸc trang bÙ ẵiẻn p cao vối ẵiẻn p hẻ thõng tữ trn 500 vỏn xoay chiậu ẵặn 15.000 vỏn xoay chiậu Trang b... thiặt b 2.3.12 Băo vẻ c qui Cc tọ c qui khỏng phăi lĂ c qui khời ẵổng ẵổng cỗ diezen phăi ẵừỡc băo vẻ qu tăi vĂ ngn mch bng cc thiặt b ẵt cĂng g·n °c qui c¡ng tât CŸc °c qui sú câ cảp ẵiẻn cho... thiặt b phũ : - iẻn p ẵnh mửc nhị hỗn hoc bng 60 vỏn : 500 vỏn - iẻn p ẵnh mửc lốn hỗn 60 vỏn : 1000 vỏn + lÃn ẵiẻn p ẵnh mửc (tõi thièu lĂ 1500 vỏn) Ngay sau thứ ẵiẻn p cao thệ ẵiẻn trờ cch ẵiẻn