990–91138–001

Specifications for Maintenance Bypass Cabinet with Output Transformer

Rating 20 kW 30 kW 40 kW 50 kW 60 kW 80 kW 100 kW
Input voltage (V) 480
Input connections 3–wire (L1, L2, L3, PE)
Nominal input current (A) 25 37 50 62 74 99 124
Maximum input current (A) 30 45 60 74 89 119 149
Output connections 4–wire (L1, L2, L3, N, PE)
Output voltage (V) 208
Output current (A) 56 83 111 139 167 222 278
Frequency (Hz) 60
Circuit breaker interrupting ratings (kA) 65 at 480 V

Trip Settings for Maintenance Bypass Cabinet with Output Transformer

NOTE: Ir, tr, and li must be set during installation. Set the breaker settings per system kW rating as listed in the table below. Changing the settings to other than the listed settings will change the 125% and 150% overload operation, and will impact system performance.
Rating (kW) Breaker Trip unit settings for unit input breaker UIB Trip unit settings for maintenance bypass breaker MBB / unit output breaker UOB
Unit input breaker UIB Maintenance bypass breaker MBB /
unit output breaker UOB
Ir tr li Ir tr li
20 HJF36150CU31X HJF36150CU31X 50 0.5 6 50 2 6
30 HJF36150CU31X HJF36150CU31X 60 0.5 6 50 2 6
40 HJF36150CU31X HJF36150CU31X 80 0.5 6 60 4 6
50 HJF36150CU31X HJF36150CU31X 90 0.5 6 70 4 6
60 JJF36250CU31X HJF36150CU31X 100 0.5 6 90 4 8
80 JJF36250CU31X HJF36150CU31X 150 0.5 6 125 2 8
100 JJF36250CU31X HJF36150CU31X 175 0.5 6 150 2 8

Recommended Upstream Protection for Maintenance Bypass Cabinet with Output Transformer

Rating (kW) Input breaker type Trip unit settings for upstream input breaker
Ir tr li
20 HJL36150CU31X 50 0.5 2
30 HJL36150CU31X 60 0.5 2
40 HJL36150CU31X 80 0.5 2
50 HJL36150CU31X 90 0.5 2
60 JJL36250CU31X 100 0.5 2
80 JJL36250CU31X 150 0.5 2
100 JJL36250CU31X 175 0.5 2

Recommended Cable Sizes for Maintenance Bypass Cabinet with Output Transformer

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 300 kcmil.
Failure to follow these instructions will result in death or serious injury.
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:

  • 90 °C (194 °F) conductors (75 °C (167 °F) termination)

  • An ambient temperature of 30 °C (86 °F)

  • Use of copper or aluminum conductors

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/Protective Earth (PE in this manual) are sized in accordance with NEC Article 250.122 and Table 250.122.

Copper 20 kW 30 kW 40 kW 50 kW 60 kW 80 kW 100 kW
Input Input phases (AWG/kcmil) 8 6 4 3 3 1/0 2/0
Input PE (AWG/kcmil) 10 10 8 8 8 6 6
Output Output phases (AWG/kcmil) 6 3 1 1/0 2/0 2 x 1 2 x 1/0
Output PE (AWG/kcmil) 10 8 6 6 6 4 4
Neutral* (AWG/kcmil) 3 1/0 3/0 2 x 1 2 x 1/0 2 x 3/0 2 x 250
DC DC +/- (AWG/kcmil) 4 3 1/0 1/0 2/0 4/0 300
DC PE (AWG/kcmil) 8 6 6 6 6 4 4
Aluminum 20 kW 30 kW 40 kW 50 kW 60 kW 80 kW 100 kW*
Input Input phases (AWG/kcmil) 6 4 2 2 1 3/0 N/A
Input PE (AWG/kcmil) 8 8 6 6 6 4 N/A
Output Output phases (AWG/kcmil) 4 2 3/0 3/0 4/0 2 x 1/0 N/A
Output PE (AWG/kcmil) 8 6 4 4 4 2 N/A
Neutral* (AWG/kcmil) 1 3/0 2 x 1/0 2 x 2/0 2 x 3/0 2 x 250 N/A
DC DC +/- (AWG/kcmil) 3 1 2/0 2/0 4/0 300 N/A
DC PE (AWG/kcmil) 6 4 4 4 4 2 N/A
NOTE: DC cables are only connected in the maintenance bypass cabinet in top cable entry systems. In bottom cable entry systems, the DC cables are connected directly in the UPS.
NOTE: The DC cable sizes given here are recommendations — Always follow the specific instructions in the battery solution documentation for DC +/- and DC PE cable sizes.
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