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Table 11.6 Recommended Cable Size and Tightening Torque for 250kVA UPS.
Bus Number Cable Size
Torque to tighten
the terminal bus
1 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
2 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
3 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
*4 Two 350MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
*5 Two 350MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
6 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
7 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
8 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
9 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
10 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
11 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
12 Two 250MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
NOTE: Maximum cable size is 600MCM.
*Two battery strings or more (consult factory if using one battery string).
Table 11.7 Recommended Cable Size and Tightening Torque for 300kVA UPS.
Bus Number Cable Size
Torque to tighten
the terminal bus
1 Two 4/0 AWG or larger 2.5~4.5 kg-m (215~386 in-lbs)
2
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
3
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
4 Three 350 MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
*5 Three 350 MCM or larger 2.5~4.5 kg-m (215~386 in-lbs)
*6
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
7
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
8
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
9 Two 4/0 AWG or larger 2.5~4.5 kg-m (215~386 in-lbs)
10
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
11
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
12
Two 4/0 AWG or larger
2.5~4.5 kg-m (215~386 in-lbs)
NOTE: Maximum cable size is 600MCM.
*Two battery strings or more (consult factory if using one battery string).