990-91377-001

Recommended Cable Sizes for IEC

DANGER
hazard of electric shock, explosion, or arc flash
  • All wiring must comply with all applicable national and/or electrical codes.
  • The maximum allowable cable size is 240 mm2.
  • Shrink sleeve must be fitted over cable lug crimped zone and must overlap with the cable insulation on all power cables.
Failure to follow these instructions will result in death or serious injury.

The maximum number of cable connections per busbar:

  • 4 on input/output/bypass busbars

  • 4 x 240 mm2 or 8 x 150 mm2 on DC+/DC- busbars

  • 8 on N busbar

  • 16 on PE busbar

NOTE: Overcurrent protection is to be provided by others.

Cable sizes in this manual are based on the minimum requirements in table B.52.3 and table B.52.5 of IEC 60364-5-52 with the following assertions:

  • 90 °C conductors

  • An ambient temperature of 30 °C

  • Use of copper or aluminum conductors

  • Installation method C

PE cable size is based on table 54.2 of IEC 60364-4-54.

If the ambient temperature is greater than 30 °C, larger conductors are to be selected in accordance with the correction factors of the IEC.

Copper

UPS rating 200 kW 250 kW 300 kW 350 kW
Voltage (V) 380 400 415 440 380 400 415 440 380 400 415 440 380 400 415 440
Input phases (mm2) 1 x 185 1 x 185 1 x 150 1 x 150 2 x 120 2 x 120 2 x 120 1 x 240 2 x 150 2 x 150 2 x 150 2 x 120 2 x 185 2 x 185 2 x 150 2 x 150
Input PE (mm2) 1 x 95 1 x 95 1 x 95 1 x 95 1 x 120 1 x 120 1 x 120 1 x 120 1 x 150 1 x 150 1 x 150 1 x 120 1 x 185 1 x 185 1 x 150 1 x 150
Bypass/output phases (mm2) 1 x 120 1 x 120 1 x 120 1 x 120 1 x 185 1 x 185 1 x 150 1 x 150 2 x 120 1 x 240 1 x 240 1 x 185 2 x 150 2 x 150 2 x 120 2 x 120
Bypass PE/output PE (mm2) 1 x 70 1 x 70 1 x 70 1 x 70 1 x 95 1 x 95 1 x 95 1 x 95 1 x 120 1 x 120 1 x 120 1 x 95 1 x 150 1 x 150 1 x 120 1 x 120
Neutral (mm2) 1 x 120 1 x 120 1 x 120 1 x 120 1 x 185 1 x 185 1 x 150 1 x 150 2 x 120 1 x 240 1 x 240 1 x 185 2 x 150 2 x 150 2 x 120 2 x 120
DC+/DC- (mm2) 1 x 240 2 x 150 2 x 185 2 x 240
DC PE (mm2) 1 x 120 1 x 150 1 x 185 1 x 240

Copper

UPS rating 400 kW 450 kW 500 kW
Voltage (V) 380 400 415 440 380 400 415 440 380 400 415 440
Input phases (mm2) 2 x 240 2 x 240 2 x 185 2 x 185 3 x 185 3 x 185 3 x 185 2 x 240 3 x 185 3 x 185 3 x 185 3 x 185
Input PE (mm2) 1 x 240 1 x 240 1 x 185 1 x 185 2 x 150 2 x 150 2 x 150 1 x 240 2 x 150 2 x 150 2 x 150 2 x 150
Bypass/output phases (mm2) 2 x 150 2 x 150 2 x 150 2 x 150 2 x 185 2 x 185 2 x 185 2 x 150 2 x 240 2 x 240 2 x 185 2 x 185
Bypass PE/output PE (mm2) 1 x 150 1 x 150 1 x 150 1 x 150 1 x 185 1 x 185 1 x 185 1 x 150 1 x 240 1 x 240 1 x 185 1 x 185
Neutral (mm2) 2 x 150 2 x 150 2 x 150 2 x 150 2 x 185 2 x 185 2 x 185 2 x 150 2 x 240 2 x 240 2 x 185 2 x 185
DC+/DC- (mm2) 3 x 185 3 x 240 3 x 240
DC PE (mm2) 2 x 150 2 x 185 2 x 185

Aluminum

UPS rating 200 kW 250 kW 300 kW 350 kW
Voltage (V) 380 400 415 440 380 400 415 440 380 400 415 440 380 400 415 440
Input phases (mm2) 1 x 240 1 x 240 1 x 240 1 x 240 2 x 185 2 x 185 2 x 185 2 x 150 2 x 240 2 x 240 2 x 240 2 x 185 2 x 240 2 x 240 2 x 240 2 x 240
Input PE (mm2) 1 x 120 1 x 120 1 x 120 1 x 120 1 x 185 1 x 185 1 x 185 1 x 150 1 x 240 1 x 240 1 x 240 1 x 185 1 x 240 1 x 240 1 x 240 1 x 240
Bypass/output phases (mm2) 1 x 185 1 x 185 1 x 185 1 x 150 2 x 120 1 x 240 1 x 240 1 x 240 2 x 185 2 x 150 2 x 150 2 x 120 2 x 240 2 x 240 2 x 185 2 x 185
Bypass PE/output PE (mm2) 1 x 95 1 x 95 1 x 95 1 x 95 1 x 120 1 x 120 1 x 120 1 x 120 1 x 185 1 x 150 1 x 150 1 x 120 1 x 240 1 x 240 1 x 185 1 x 185
Neutral (mm2) 1 x 185 1 x 185 1 x 185 1 x 150 2 x 120 1 x 240 1 x 240 1 x 240 2 x 185 2 x 150 2 x 150 2 x 120 2 x 240 2 x 240 2 x 185 2 x 185
DC+/DC- (mm2) 2 x 150 2 x 240 3 x 185 3 x 240
DC PE (mm2) 1 x 150 1 x 240 2 x 150 2 x 185

Aluminum

UPS rating 400 kW 450 kW 500 kW
Voltage (V) 380 400 415 440 380 400 415 440 380 400 415 440
Input phases (mm2) 3 x 185 3 x 185 3 x 185 3 x 185 3 x 240 3 x 240 3 x 240 3 x 185 4 x 185 4 x 185 3 x 240 3 x 240
Input PE (mm2) 2 x 150 2 x 150 2 x 150 2 x 150 2 x 185 2 x 185 2 x 185 2 x 150 2 x 185 2 x 185 2 x 185 2 x 185
Bypass/output phases (mm2) 2 x 240 2 x 240 2 x 240 2 x 240 3 x 185 3 x 185 2 x 240 2 x 240 3 x 240 3 x 185 3 x 185 3 x 185
Bypass PE/output PE (mm2) 1 x 240 1 x 240 1 x 240 1 x 240 2 x 150 2 x 150 1 x 240 1 x 240 2 x 185 2 x 150 2 x 150 2 x 150
Neutral (mm2) 2 x 240 2 x 240 2 x 240 2 x 240 3 x 185 3 x 185 2 x 240 2 x 240 3 x 240 3 x 185 3 x 185 3 x 185
DC+/DC- (mm2) 4 x 185 4 x 240
DC PE (mm2) 2 x 185 2 x 240 3 x 240

Guidance for Organizing Input, Bypass, And Output Cables

NOTICE
Risk of equipment damage
To ensure correct load sharing in bypass operation in a parallel system:
  • All bypass cables must be the same length for all UPSs.
  • All output cables must be the same length for all UPSs.
  • All input cables must be the same length for all UPSs (only required in single mains system).
Failure to follow these instructions can result in equipment damage.

The input, bypass, and output cables must be grouped in circuits. On raceways, use one of the two shown cable formations.

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