The following table indicates the currents and recommended sizes of overcurrent
protection. Size the cables in accordance with local codes and National Electrical Code
(NEC).
In cases where the cables are so long that they cause a drop in voltage of >3%, a larger
dimension shall be selected.
Table B: Recommended circuit breakers for UPS Input
UPS Size (kVA)
Input voltage
4 5 6 8 10 12 14 16 18
Max. Input Current (amps)
21 26 42 52 71 81 91
208
Recommended Breaker Rating
(amps)
30 35
N/A
60 65
N/A
90 110 125
Max. Input Current (amps)
18 23 27 36 45 54 61 70 79
240
Recommended Breaker Rating (amps)
25 30 35 45 60 70 80 90 100
1.5.6
Output branch protection
Size the output branch protection per NEC and local code requirements, keeping in mind
the maximum UPS ratings given in Table C below.
Table C: Maximum rated UPS output current
UPS Rating (kVA) Nominal UPS
Output Voltage(s)
4 5 6 8 10 12 14 16 18
120 only 33 42 50 67 83 100 N/A N/A N/A
208 only 19 24 29 38 48 58 67 77 87
240 only 17 21 25 33 42 50 58 67 75
120/208* 33/19 42/24 50/29 67/38 83/48 100/58 117/67 133/77 150/87
120/240** 17 21 25 33 42 50 58 67 75
* 120/208 configuration is NOT a 3-wire system. Total not to exceed rating of the unit.
** 120/240 rating is per leg for 120VAC and total for 240VAC. Total kVA is not to exceed
rating of the UPS.
The input and output currents indicated above shall be considered continuous duty per
NEC requirements. The line wiring must be compatible with the required breaker and in
accordance with all applicable codes.
1.5.7 SPECIFICATIONS FOR LOAD WIRING
This system was equipped at the factory with the load voltage combinations as specified
on your order.
A separate pair of wires shall be supplied for each load branch circuit. Load wiring must be
in accordance with all local and applicable code requirements.
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