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MV distribution Factory built assemblies SM6 range to 24 kV interrupteur sectionneur Un Ith In 24kV 12,5kA 400A - 50/60Hz IM Uw 125kV IMA 31,5KA HN 64 S 41-IEC 298 92 16 001 L interrupteur sectionneur Un Ith In 24kV 12,5kA 400A - 50/60Hz IM Uw 125kV IMA 31,5KA HN 64 S 41-IEC 298 92 16 008 L combiné interrupteur fusibles Un Ith In 24kV 12,5kA 200A - 50/60Hz QM Uw 125kV IMA 31,5KA HN 64 S 41-IEC 298 FUSIBLE MERLIN GERIN TYPE SOLE FUSE IN 63A PERCUTEUR MOYEN IEC 420 9221107L MERLIN GERIN MERLIN GERIN MERLIN GERIN SM6 SM6 SM6 ■ Merlin Gerin ■ Square D ■ Telemecanique SM6 range contents pages field of application c MV/LV transformer substations c industrial distribution substations general c introduction, standards, designation c characteristics description of functions c connection to the networks c protection 6-7 c MV metering c functions required by private networks 8-9 three-component unit 10-11 description c switch and 12 circuit breaker cubicles c contactor cubicles 13 c compartments 14-15 c switch or disconnector and 16 earthing switch c Fluarc SFset or SF1 circuit breaker 17 c Rollarc 400 or 400D contactor 18 c control/monitoring and 19 protection functions unit selection c for connection to the network 20 c for protection 21 to 26 c for MV metering 27-28 c for functions required 29 to 33 by private networks operating mechanisms 34-35 auxiliaries 36 instrument transformers c current transformers 37-38 c voltage transformers 39 fuses 40-41 interlocks 42-43 connections 44 to 46 installation 47-48 VM6 extension and layout examples 49 personal notes 50 to 52 SM6 range field of application definitions Below is the list of SM6 range units used in MV/LV transformer substations and industrial distribution substations c IM, IMC, IMB: incoming or outgoing unit c PM: fused switch c QM, QMC, QMB: fuse-switch combination c CRM: contactor and contactor with fuses c DM1-A, DM1-D: single-isolation circuit breaker c DM1-W, DM1-Z : withdrawable singleisolation circuit breaker c DM2: double-isolation circuit breaker c CM, CM2: voltage transformers c GBC-A, GBC-B: current and/or voltage measurements c NSM-cables: for main incoming and standby c NSM-busbars: for main incoming and cables for standby c GIM: intermediate bus unit c GEM: extension unit c GBM: connection unit c GAM2, GAM: incoming cable connection unit c SM: disconnector c TM: MV/LV transformer unit for auxiliaries c other units: consult Merlin Gerin MV/LV transformer substations UTE standards MV consumer substation (MV metering) IM IM CM DM2 QM PM IM incoming line of the main distribution switchboard Combined public distribution/consumer substation MV consumer substation (LV metering) MV/LV transformer substation PM IM GAM IM IM GIM QM outgoing line toward other ring substations other standards MV consumer substations (MV metering) IM IM DM1-D GBC-A outgoing line toward other ring substations incoming line of the main distribution switchboard QM DM1-A IM QM PM industrial distribution substations Distribution switchboard DM1-A CM QMC IM IM DM1-D GBM DM1-A QMC CM incoming line n° of private MV substation incoming line n° of private MV substation MV/LV transformer substations PM NSM-2 GBM SM TM NSM-1 QM CRM CRM standby utility source standby generator source Distribution switchboard CM QM QM incoming line n° of private MV substation IMC IMB GBM IMC QM CM incoming line n° of private MV substation SM6 range general introduction The SM6 range is made up of modular units containing fixed or withdrawable metal-enclosed SF6 switchgear, including: c switch-disconnectors; c Fluarc SF1 or SFset circuit breakers; c Rollarc 400 or 400D contactors; c disconnectors SM6 units are used for the MV section in MV/LV transformer substations in public distribution systems and MV consumer or distribution substations up to 24 kV In addition to its technical characteristics, SM6 meets requirements concerning protection of life and property as well as ease of installation and operation SM6 units are designed for indoor installation (IP2XC) Their compact dimensions are: c 375 to 750 mm wide; c 1600 mm high; c 840 mm deep This makes for easy installation in small rooms or prefabricated substations Cables are connected via the front All control functions are centralised on a front plate, thus simplifying operation The units may be equipped with a number of accessories (relays, toroids, instrument transformers, etc.) standards SM6 units meet all the following recommendations, standards and specifications: c recommendations: IEC 298, 265, 129, 694, 420, 56; c UTE standards: NFC 13.100, 13.200, 64.130, 64.160; c EDF specifications: HN 64-S-41, 64-S-43 designation SM6 units are identified by a code including: c an indication of the function, i.e the electrical diagram code: IM - QM - DM1 - CM - DM2 - etc.; c the rated current: 400 - 630 - 1250 A; c the rated voltage: 7.2 - 12 - 17.5 - 24 kV; c the maximum short-time withstand current values: 12.5 - 16 - 20 - 25 kA/1s Example For a unit designated IM 400 - 24 - 12.5 c IM indicates an incoming or outgoing unit; c 400 indicates the rated current is 400 A; c 24 indicates the rated voltage is 24 kV; c 12.5 indicates the short-time withstand current is 12.5 kA/1s main electrical characteristics The hereunder values are for working temperatures from -5° C up to +40° C and for a setting up at an altitude below 1000 m rated voltage (kV) 7.2 12 17.5 insulation level 20 28 38 50 Hz / mn insulation (kV rms) isolation 23 32 45 1,2 / 50 µs insulation 60 75* 95 (kV peak) isolation 70 85 110 breaking capacity transformer off load (A) 16 cables off load (A) 25 short-time 25 630 - 1250 A withstand current 20 630 - 1250 A (kA / s) 16 630 - 1250 A 12.5 400 - 630 - 1250 A The making capacity is equal to 2.5 times the short-time withstand current * 60 kV peak for the CRM unit 24 50 60 125 145 general characteristics Maximum breaking capacity rated voltage (kV) units IM, IMC, IMB, NSM-cables, NSM-busbars PM,QM, QMC, QMB CRM CRM with fuses DM1-A, DM1-D, DM1-W, DM1-Z DM2 7.2 12 17.5 24 630 A 25 kA 10 kA 25 kA 25 kA 20 kA 20 kA kA 12.5 kA 20 kA 16 kA Endurance units IM, IMC, IMB PM QM*, QMC*, QMB* NSM-cables, NSM-busbars CRM DM1-A, DM1-D, DM1-W, DM1-Z DM2 mechanical endurance IEC 265 1000 operations electrical endurance IEC 265 100 breaks at In, pf = 0.7 IEC 56 300 000 operations IEC 56 100 000 breaks at 320 A 300 000 breaks at 250 A IEC 56 40 breaks at 12.5 kA 10 000 breaks at In, pf = 0.7 IEC 56 10 000 operations * as per recommendation IEC 420, three breakings at pf=0.2 c 1730 A / 12 kV, c 1400 A / 24 kV Electro-magnetic compatibility c relays: kV withstand capacity, as per recommendation IEC 801.4; c compartments: v electrical field: - 40 dB attenuation at 100 MHz; - 20 dB attenuation at 200 MHz; v magnetic field: 20 dB attenuation below 30 MHz Temperatures : c for stocking: from -40°C to +70°C, c for working: from -5°C to +40°C, c other temperatures, consult us SM6 range description of functions units for all functions: connection to the networks Incoming or outgoing unit IM (375 or 500 mm) page Incoming or outgoing unit IMC (500 mm) Outgoing unit, right or left IMB (375 mm) 20 protection Fused-switch unit PM (375 mm) Fuse-switch combination unit QM (375 mm) 21 Fuse-switch combination unit QMC (625 mm) Fuse-switch combination unit, right or left outgoing line QMB (375 mm) 22 protection (cont.) page Contactor unit CRM (750 mm) Fused-contactor unit CRM (750 mm) 23 Single-isolation circuit breaker unit DM1-A (750 mm) Single-isolation circuit breaker unit, right or left outgoing line DM1-D (750 mm) 24 Withdrawable single-isolation circuit breaker unit DM1-W (750 mm) Withdrawable single-isolation circuit breaker unit, right outgoing line DM1-Z (750 mm) Double-isolation circuit breaker unit, right or left outgoing line DM2 (750 mm) 25-26 SM6 range description of functions (cont.) units for all functions: MV metering page Voltage transformers for mains with earthed neutral system CM (375 mm) Voltage transformers for mains with insulated neutral system CM2 (500 mm) 27 Current and/or voltage measurement unit, right or left outgoing line GBC-A (750 mm) Current and/or voltage measurement unit GBC-B (750 mm) 28 functions required by private networks Intermediate bus unit GIM (125 mm) Extension unit VM6/SM6 GEM (125 mm) Connection unit, right or left outgoing line GBM (375 mm) 29 functions required by private networks (cont.) page Incoming cable-connection unit GAM2 (375 mm) Incoming cable-connection unit GAM (500 mm) Disconnector unit SM (375 or 500 mm) MV/LV transformer unit for auxiliaries TM (375 mm) N Cables power supply for main incoming line and standby line NSM-cables (750 mm) S 30 31 S Busbars power supply for main incoming line on right or left and cables for standby line NSM-busbars (750 mm) N 32-33 SM6 range auxiliaries Motor option and releases for switch-units The operating mechanisms CIT, CI1 and CI2 may be motorised Un power supply (V) motor option DC 24 48 110 (W) (VA) (s) opening releases Mitop (low energy) (W) shunt trip (W) (VA) undervoltage pick-up (W) (VA) hold (W) (VA) closing release shunt trip (W) (VA) AC 120 125 230 (50 Hz)* 200 200 500 kW), The indicated values are for Fusarc fuses (to DIN standard 43-625) Example: Consider a 950 kW motor at kV In = P e U η pf = 130 A Id = x In = 780 A Then select the next higher value, i.e 790 A For six 5-second starts per hour, select fuses rated 200 A Note : The same motor could not be protected for 12 starts per hour since the maximum service voltage for the required 250 A rated fuses is 3.3 kV starting current (A) 1410 1290 1140 1030 890 790 710 640 610 540 480 440 310 280 250 240 230 210 180 170 starting time (s) number of starts per hour 10 20 12 12 12 250 250 250 250 250 200 200 200 200 160 160 160 160 125 125 125 125 100 100 100 250 250 250 250 250 200 200 200 200 160 160 160 160 125 125 125 125 100 100 250 250 250 250 250 200 200 200 200 160 160 160 160 125 125 125 125 100 100 250 250 250 250 250 200 200 200 200 160 160 160 160 125 125 125 100 100 250 250 250 250 250 200 200 200 200 160 160 160 160 125 125 125 100 100 250 250 250 250 250 200 200 200 200 160 160 160 160 125 125 125 100 Maximum switchable power (kW) (direct on-line startup, six sec starts per hour) service voltage (kV) 3.3 4.16 without fuses 1550 1960 2360 with fuses 100 A 140 180 215 200 A 625 800 960 250 A 1135 Access to fuses Access is via the front with the front panel removed Fuses may be removed without tools by simply pulling them forward The field deflector pivots and automatically returns to its position 5.5 2590 240 1060 2830 260 1155 6.6 3110 285 1270 maximum service voltage (kV) 3.3kV 6.6 kV 11 kV 10 4710 435 11 5180 480 Replacement of fuses When fault clearance results in one or two blown fuses, it is still common practice to replace only the blown fuses However, though the remaining fuse(s) may apparently be in good condition, their operating characteristics are generally reduced due to the short-circuit If nonblown fuses remain in service, they may blow even at very low over-current values In systems where continuity of service is of importance, it is recommended to replace all three fuses, in compliance with IEC recommendation 282.1 41 SM6 range interlocks functional interlocks Interlocks comply with IEC recommendation 298 and EDF specification HN 64-S-41 Switch units c the switch can be closed only if the earthing switch is open and the access panel is in position c the earthing switch can be closed only if the switch is open c the access panel for connections can be opened only if the earthing switch is closed c the switch is locked in the open position when the access panel is removed The earthing switch may be operated for tests Circuit-breaker units c the disconnector(s) can be closed only if the circuit breaker is open and the access panel is in position c the earth switch(es) can be closed only if the disconnector(s) is/are open c the access panel for connections can be opened only if: v the circuit breaker is locked open v the disconnector(s) is/are open v the earth switch(es) is/are closed In addition to the functional interlocks, each disconnector and switch include: ■ built-in padlocking capacities (padlocks not supplied) ■ four knock-outs that may be used for keylocks (supplied on request) for mechanism locking functions Unit interlock units IM, IMB, IMC PM, QM, QMB, QMC, DM1-A, DM1-D, DM1-W, DM1-Z CRM NSM GAM SM interlock A1 A3 ■ ■ key-type interlocks outgoing units O Aim : c to prevent the closing of the earthing switch on a transformer protection unit unless the LV circuit breaker is locked in "open" or "disconnected" position type A1 c to prevent the access to the transformer if the earthing switch for transformer protection has not first been closed S S type C1 O S O S type C4 42 C1 C4 ■ ■ P1 ■ P2 P3 ■ ■ P5 ■ ■ Note: It is possible to lock the disconnector(s) in the open position for noload operations with the circuit breaker O A4 ■ c to prevent the closing of the earthing switch on a transformer protection unit unless the LV circuit breaker is locked in "open" or "disconnected" position c to prevent the access to the transformer if the earthing switch for transformer protection has not first been closed ■ ■ ring units O Aim : c to prevent the closing of the earthing switch of a load-side cubicle unless the line-side switch is locked "open" O type A3 O c to prevent the simultaneous closing of two switches O type A4 X O X c to prevent the closing of an earthing switch if the switch of the other unit has not been locked in the open position O type P1 X O O c to prevent on-load operation of the disconnector unless the switch is locked "open", c to prevent the closing of the earthing switches unless the disconnector and the switch are locked "open" X type P2 A X O O X c to prevent on-load operation of the disconnector unless the switch is locked "open", c to prevent the closing of the earthing switches with the unit energised, unless the disconnector and the switch are locked "open", c to allow off-load operation of the switch type P3 c to prevent the closing of the earthing switch of the incoming unit unless the disconnector and the switch is locked "open" P P legend forserrures key-type interlocks légende avec : type P5 clé key absente no free key clé libre captive key clé prisonnière panel or door panneau ou porte 43 SM6 range connections connections with dry-type cables Dry-type cables connect via short simplified terminations (EUIC): c with a field deflector or a linear voltage distributor for type HN 33-S-22 single-core copper or aluminium cables; c with a linear voltage distributor for type HN 33-S-23 single-core or three-core* cables The termination lug must be connected to the integrated stud on the field deflector, using a torque wrench set to 50 mN cabling from below all units c through trenches The trench depth P is given in the table opposite for commonly used types of cables c with stands To reduce P or eliminate trenches altogether by placing the units on 400 mm footings c with floor void The trench depth P is given in the table opposite for commonly used types of cables cabling from above On each unit of the range, except those including an enlarged low-voltage compartment, the connection is made with dry-type and single-core cables (1 or cables per phase up to 240 mm2 *) The enlarged low-voltage compartment may be equipped with neon indicators for cable terminal * only for the 400 - 630 A units 44 cabling from below for the 400 - 630 - 1250 A units single-core cables cable bending X-section radius (mm2) (mm) 50 70 95 120 150 185 240 400 630 370 400 440 470 500 540 590 800 940 units until 630 A IM(1), SM(1) IMC(1), CRM, NSM-cables, DM1-A, DM1-W, NSM-busbars GAM depth P (mm) all orientations P1 P2 140 400 150 430 160 470 200 500 220 550 270 670 330 730 PM, QM, QMC (2) P3 350 350 350 1250 A units SM, DM1-A (3) GAM DM1-W (3) P4 P5 1000 1000 1350 1350 (1) double-connection equipment possible up to 240 mm2 must be installed with a 100 mm deep pan (3) must be installed with a 350 mm deep pan, in a floor void (2) Note: The unit and the cables requiring the greatest depth must be taken into account when determining the depth P for single-trench installations In double-trench installations, depth P must be taken into account for each type of unit and cable orientations trench diagrams: examples Rear entry or exit with conduits Cable entry or exit through right or left side Front entry or exit with conduits P1 220 600 Ø 200 P2 220 600 20 IM 70 P2 P1 Ø 200 IM Ø 200 IM 220 P3 600 20 20 70 70 QMC IM Ø 200 Ø 200 IM DM1 DM1 IM 100 20 100 20 100 required dimensions (mm) Note: For connection with conduits, the bevel must correspond to the following trench dimensions, P1 = 75 mm or P2/P3 = 150 mm 45 SM6 range connections (cont.) cable-connection height measured from floor (mm) IM, NSM-cables, NSM-busbars, SM (1) IMC PM, QM QMC CRM 950 450 400 340 430 DM1-A SF1 430 or 650 DM1-A SFset 370 DM1-W 360 or 650 GAM2 760 GAM 470 or 620 (1) 870 mm for the 1250 A SM unit with cables per phase (2) for the 1250 A units H H H 400 200 200 200 200 IM, NSM cables, NSM busbars, SM 420 IMC, PM, QM, QMC H 200 200 420 420 CRM H 200 200 200 420 420 GAM GAM2 H H 200 200 420 DM1-A, DM1-W 400 - 630 A 200 200 420 DM1-A, DM1-W 1250 A 46 200 (2) (2) (2) SM6 range installation floor preparation dimensions and weights Units may be installed on ordinary concrete floors, with or without trenches depending on the type and cross-section of cables Required civil works are identical for all 400 - 630 A units To reduce the depth of trenches by 400 mm (for the 400- 630 A units), which in many cases is sufficient to eliminate trenches altogether, units may be installed on a concrete footing prepared when pouring the floor Installation of 400 - 630 A units on a footing: c enables installation in rooms where trenches are not possible; c in no way affects substation switching operation For the 1250 A units DM1-A and DM1-W, a floor void must be foreseen typ of unit fixing of units With each other The units are simply bolted together to form the MV switchboard (bolts supplied) Busbar connections are made using a torque wrench set to 28 mN On the floor c for switchboards comprising up to three units, the four corners of the switchboard must be secured to the floor using: v M8 bolts (not supplied) screwed into nuts set into the floor using a sealing pistol; v screw rods grouted into the floor; c for switchboards comprising more than three units, the number and position of fixing points depends on local criteria (earthquake withstand capacities, etc.) Each unit may be fixed as necessary c position of fixing holes b depends on the width of units: 15 a b IM, IMB IMC PM, QM, QMB QMC CRM DM1-A, DM1-D, DM1-W, DM1-Z, DM2 CM CM2 GBC-A, GBC-B NSM-cables, NSM-busbars GIM GEM(2) GBM GAM2 GAM SM TM height (mm) 1600 (1) 1600 (1) 1600 (1) 1600 (1) 2050 1600 (1) 1600 (1) 1600 (1) 1600 2050 1600 1600 1600 1600 1600 1600 (1) 1600 width (mm) 375 500 375 625 750 750 375 500 750 750 125 125 375 375 500 375/500 (3) 375 depth (mm) 940 940 940 940 940 1220 940 940 1020 940 840 920 or 1060 870 870 1020 940 940 weight (kg) 120 200 130 230 390 400 190 210 290 260 30 30 or 35 120 120 120 120 190 Add to heights: (1) 450 mm for low-voltage enclosures for control/monitoring and protection functions To ensure uniform presentation, all units (except GIM and GEM) may be equipped with low-voltage enclosures (2) depending on the busbar configuration in the VM6 unit, two types of extension units may be used: - to extend a VM6 DM12 or DM23 unit, use an extension unit with a depth of 1060 mm; - for all other VM6 units, a depth of 920 mm is required (3) for the 1250 A unit 15 50 740 840 12,3 x 12,3 a (mm) b (mm) 50 125 95 375 345 500 470 625 595 750 720 Note: In circuit-breaker or contactor units, fixing devices are installed on the side opposite the switchgear 47 SM6 range installation (cont.) dimensions 840 450 450 450 1600 1600 1600 30 70 840 IM, IMB, PM, QM, QMB, SM 80 840 450 450 1600 1600 840 100 200 140 GIM 920 GEM 1600 48 100 1600 80 840 100 GBC-A, GBC-B 1600 840 GAM 30 70 NSM-cables, NSM-busbars 1600 840 840 CRM IMC, QMC, CM, CM2 DM1-A, DM1- D, DM1- W, DM1-Z, DM2 80 80 30 30 70 1600 840 GBM, GAM2 30 SM6 range VM6 extension and layout examples conventional masonry substation Bocage prefabricated substation 100 IM IM ou CM DM1-D ou DM2 GBC-A QM 20 840 100 20 200 1200 minimum required dimensions (mm) VM6 switchboard extension example Front view dimensions Bottom view dimensions 920 ou 1060 1500 VM6 SM6 VM6 SM6 840 1600 front view switchboard 500 125 375 49 Schneider Electric SA Postal address F-38050 Grenoble cedex FRANCE Tel: +33 (0)4 76 57 60 60 Telex: merge 320842 F http://www.schneiderelectric.com Rcs Nanterre B 954 503 439 AC0356/3EN ART.62620 As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication This document has been printed on ecological paper Publishing: Schneider Electric SA Design, production: Idra Printing: 05/1997 [...].. .SM6 range three-component unit 1 cubicle 2 switchgear 3 control/monitoring and protection 3 1 2 N R LI ME 6 SM MER VIP 2 10 LIN 13 GER IN GE R IN factory-built cubicles Switch cubicle Circuit breaker cubicle Contactor cubicle Fluarc SFset or SF1 circuit breaker Rollarc 400 or 400D contactor incorporating SF6 switchgear Switch-disconnector and earthing switch... compartments: 1 switchgear: disconnector and earthing switch in an enclosure filled with SF6 and satisfying «sealed pressure system» requirements 2 5 1 4 LIN M ER6 SM GE RI N 3 Total operating safety is guaranteed in the SM6 range by the division of cubicles into five distinct compartments and the simplicity of switching operations enhanced by functional interlock systems 3 connection and switchgear: accessible... may be accessed with the cables and busbars energised and without isolating the substation * please consult us 15 SF6 range description (cont.) SF6 switchgear SF6, the switchgear manufacturer’s gas switch or disconnector and earthing switch F F F F S F F SM6 switch-disconnectors and earthing switches and the SFset and SF1 circuit breakers use sulphur hexafluoride gas (SF6) for insulation and breaking... (MV metering) Statimax ensures, without an auxiliary source of power and following a given time delay, protection in the event of phase or zerosequence faults 11 SM6 range description factory-built cubicles 5 compartments: switch cubicles 1 switchgear: switch-disconnector and earthing switch in an enclosure filled with SF6 and satisfying «sealed pressure system» requirements 2 5 1 4 LIN M ER6 SM GE... system The position of the inspection windows in cubicle panels may vary depending on future modifications in specifications and standards 13 gamme SM6 description (cont.) Cubicles are made up of five compartments separated by metal or insulating partitions 14 switchgear compartment (switch and/or disconnector) busbar compartment This compartment is separated from the busbar compartment and the connection... insulated busbars are parallelmounted Connection is made to the upper pads of the enclosure using a field distributor with integrated captive screws Ratings 400 - 630 - 1250 A connection and switchgear compartment (circuit breaker) operating-mechanism compartment low-voltage compartment The network cables are connected to the terminals of the switch and the earthing switch Transformer cables are connected... additional enclosure may be added on top of the cubicle circuit breaker cubicle 5 compartments: 1 switchgear: disconnector(s) and earth switch(es) in an enclosure filled with SF6 and satisfying «sealed pressure system» requirements 5 2 1 4 LIN M ER6 SM GE RI N 3 IN GERIN 13 IN GERIN MERL VIP 12 3 connection and switchgear: accessible through front, connection to the downstream terminals of the circuit breaker... contact moving arcing contact fixed arcing contact sealing system compression chamber moving piston valves insulating nozzle périodeperiod d'arc arcing appareil ouvert contacts open 17 SM6 range description (cont.) SF6 switchgear (cont.) Rollarc 400 or 400 D contactor The three phases are placed in an enclosure filled with SF6 gas to a relative pressure of 2.5 bars (2500 hp) This system offers maximum... c additional enclosure, c three voltage transformers (phase-to-earth), c or two voltage transformers (phase-to-phase) 28 24 kV SM6 range unit selection for functions required by private networks GIM (125 mm) GEM (125 mm) GBM (375 mm) Intermediate bus unit Extension unit VM6 /SM6 Connection unit, outgoing line right or left Electrical characteristics kA kA 25 20 630 - 1250 A 16 12,5 24 400 - 630 - 1250... insulated neutral systems Note: The source transfer assemblies are described with the corresponding units on page 33 These equipments (except VIP and Statimax) are set up in a low voltage compartment 19 SM6 range unit selection for connection to the network IM (375 or 500 mm) IMC (500 mm) IMB (375 mm) Incoming or outgoing unit Incoming or outgoing unit Outgoing unit (right or left) Electrical characteristics ... line n° of private MV substation SM6 range general introduction The SM6 range is made up of modular units containing fixed or withdrawable metal-enclosed SF6 switchgear, including: c switch-disconnectors;... consult us 15 SF6 range description (cont.) SF6 switchgear SF6, the switchgear manufacturer’s gas switch or disconnector and earthing switch F F F F S F F SM6 switch-disconnectors and earthing switches... addition to its technical characteristics, SM6 meets requirements concerning protection of life and property as well as ease of installation and operation SM6 units are designed for indoor installation