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