Required Upstream Protection and Cable Sizes
 DANGER |
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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 4/0 AWG.
Failure to follow these instructions will result in death or serious injury.
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NOTE: Overcurrent protection and
cable lugs are to be provided by others.
Cable sizes in this manual are based on Table 310.15 (B)(16) of the National Electrical Code (NEC) with the following assertions:
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90 °C (194 °F) conductors (75 °C (167 °F) termination)
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An ambient temperature of 30 °C (86 °F)
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Use of copper conductors
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Installation method C
If the ambient temperature is greater than 30 °C (86 °F), larger conductors are to be selected in accordance with the correction factors of the NEC.
Equipment grounding conductors (EGC) are sized in accordance with NEC Article 250.122 and Table 250.122.
NOTE: The battery cable sizes given here are recommendations. Always
follow the specific instructions in the battery solution documentation
for battery +/- and battery EGC cable sizes.
NOTE: Neutral conductor
is sized to handle 1.73 times phase current in case of high harmonic
content from non-linear loads. If few or no harmonic currents are
expected, neutral conductor can be sized as phase conductor. In dual
mains systems, the input neutral conductor can be sized as the input
phase conductor.
| UPS rating | 10 kVA | 15 kVA | 20 kVA | 30 kVA | 40 kVA | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Input phases (AWG/kcmil) | 8 | 6 | 4 | 1 | 2/0 | |||||
| Input EGC (AWG/kcmil) | 10 | 8 | 8 | 6 | 6 | |||||
| Bypass/output phases (AWG/kcmil) | 8 | 6 | 4 | 1 | 2/0 | |||||
| Bypass EGC/output EGC (AWG/kcmil) | 10 | 8 | 8 | 6 | 6 | |||||
| Neutral (AWG/kcmil) | 4 | 3 | 1/0 | 2x1/0 | 2x2/0 | |||||
| Battery +/-/N (AWG/kcmil) | 4/0 | 4/0 | 4/0 | 4/0 | 4/0 | |||||
| Battery EGC (AWG/kcmil) | 10 | 8 | 8 | 6 | 6 | |||||
