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Terminal Bus 300kVA
The terminal buses shown are located at the top inside of the 300kVA UPS. Dashed line in
each terminal stands for side view of screw holes to tighten lugs.
External cable size is recommended in the Table 3. This table shows only the torque to tighten
a terminal bus and a corresponding lug. Torque to tighten the cable end in a compression lug
shall be specified by the lug vendor recommended in Table 4.
Table 3 - Recommended Cable Size and Tightening Torque for 300kVA UPS.
The tightening torque must be greater than 90 percent of the recommended torque.
Cable Size and Tightening Torque at 300kVA UPS Terminals
Bus Number
Cable Size
(Only copper wires allowed)
Torque to tighten
the terminal bus
1 Two 4/0 AWG or larger 215-386 in-lbs
2 Two 4/0 AWG or larger 215-386 in-lbs
3 Two 4/0 AWG or larger 215-386 in-lbs
*4 Three 350 MCM or larger 215-386 in-lbs
*5 Three 350 MCM or larger 215-386 in-lbs
6 Two 4/0 AWG or larger 215-386 in-lbs
7 Two 4/0 AWG or larger 215-386 in-lbs
8 Two 4/0 AWG or larger 215-386 in-lbs
9 Two 4/0 AWG or larger 215-386 in-lbs
10 Two 4/0 AWG or larger 215-386 in-lbs
11 Two 4/0 AWG or larger 215-386 in-lbs
12 Two 4/0 AWG or larger 215-386 in-lbs
NOTE: Maximum cable size is 350MCM.
*Two battery strings (consult factory if using one battery string).
3-phase 3-wire
3-phase 4-wire
1 2 3 64 5 7 8 9 10 11 12
U V
W
- + U V
W
VUN
W
AC INPUT
BYPASS INPUTBATTERY
AC OUTPUT
3-phase 4-wire