990–91138–001

Specifications for Maintenance Bypass Cabinet with Input Transformer

Rating 10 kW 15 kW 20 kW 25 kW 30 kW 40 kW 50 kW
Input voltage (V) 480/600 480/600 480/600 480/600 480/600 480/600 480/600
Input connections 3–wire (L1, L2, L3, PE)
Nominal input current (A) 13/10 19/15 26/20 32/26 38/31 51/41 64/51
Maximum input current (A) 15/12 23/16 31/25 38/31 46/37 61/49 77/61
Output connections 4–wire (L1, L2, L3, N, PE)
Output voltage (V) 208
Output current (A) 28 42 56 69 83 111 139
Frequency (Hz) 60
Circuit breaker interrupting ratings (kA) 100 at 240 V
Continuous operation limited to maximum 110% load.

Trip Settings for Maintenance Bypass Cabinet with Input 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 type Trip unit settings for unit input breaker UIB Trip unit settings for maintenance bypass breaker MBB / unit output breaker UOB
Ir tr li Ir tr li
10 HJF36150CU31X 50 0.5 1.5 50 0.5 1.5
15 HJF36150CU31X 60 0.5 1.5 50 4 1.5
20 HJF36150CU31X 80 0.5 1.5 70 4 1.5
25 HJF36150CU31X 100 0.5 1.5 80 4 1.5
30 JJF36250CU31X 110 4 1.5 100 4 1.5
40 JJF36250CU31X 150 4 1.5 150 4 1.5
50 JJF36250CU31X 200 0.5 1.5 175 2 1.5

Recommended Upstream Protection for Maintenance Bypass Cabinet with Input Transformer

For 480 V Input

Rating (kW) Input breaker type Trip unit settings for upstream input breaker
Ir tr li
10 HJL36060U31X 15 4 6
15 HJL36060U31X 25 4 6
20 HJL36060U31X 30 4 6
25 HJL36060U31X 35 4 6
30 HJL36060U31X 45 4 12
40 HJL36060U31X 60 4 12
50 HJL36100U31X 70 4 8

For 600 V Input

Rating (kW) Input breaker type Trip unit settings for upstream input breaker
Ir tr li
10 HJL36060U31X 15 1 6
15 HJL36060U31X 20 4 6
20 HJL36060U31X 25 4 6
25 HJL36060U31X 30 4 6
30 HJL36060U31X 35 8 12
40 HJL36060U31X 45 8 12
50 HJL36060U31X 60 4 12

Recommended Cable Sizes for Maintenance Bypass Cabinet with Input 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 4/0 AWG.
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 10 kW 15 kW 20 kW 25 kW 30 kW 40 kW 50 kW
Input Input phases (AWG/kcmil) 8 8 8 8 4 4 4
Input PE (AWG/kcmil) 10 10 10 10 10 8 8
Output Output phases (AWG/kcmil) 8 8 4 4 3 1 2/0
Output PE (AWG/kcmil) 10 10 8 8 8 6 6
Neutral* (AWG/kcmil) 8 4 2 1 1/0 3/0 2 x 1
DC DC +/- (AWG/kcmil) 10 6 4 4 2 1/0 1/0
DC PE (AWG/kcmil) 10 10 8 8 6 6 6
Aluminum 10 kW 15 kW 20 kW 25 kW 30 kW 40 kW 50 kW
Input Input phases (AWG/kcmil) 6 6 6 6 2 2 2
Input PE (AWG/kcmil) 8 8 8 8 8 6 6
Output Output phases (AWG/kcmil) 6 6 3 2 1 3/0 4/0
Output PE (AWG/kcmil) 8 8 6 6 6 4 4
Neutral* (AWG/kcmil) 6 3 1 2/0 3/0 2 x 1 2 x 2/0
DC DC +/- (AWG/kcmil) 8 4 3 2 1/0 2/0 2/0
DC PE (AWG/kcmil) 8 8 6 6 4 4 4
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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