Electrical Connections
2.1.2UPS Input Configuration
Figure 2 illustrates the NX in a split bypass
Figure 2 Single module block
| SW1/D | Maintenance Bypass |
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| SW1/C | Contactor | Static Switch |
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Bypass Input |
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AC Utility Input | Rectifier | Inverter | Contactor | SW1/A | UPS |
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| CB1 |
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Neutral Wire | Discharge | Battery |
| SW1/B |
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| Charger |
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| Battery |
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2.1.3Cabling Guidelines
The following are guidelines only and are superseded by local regulations and codes of practice where applicable.
1.Take special care when determining the size of the neutral cable, as current circulating on the neutral cable may be greater than nominal current in the case of
2.The ground conductor should be sized according to such factors as the fault rating, cable lengths and type of protection. The ground cable connecting the UPS to the main ground system must follow the most direct route possible. Control wiring and power wiring must be run in separate conduit. Output and input cables must be run in separate conduit.
3.Consider using paralleled smaller cables for heavy
4.When sizing battery cables, a maximum voltage drop of 4VDC is permissible at the current ratings in Table 10. For terminal connection sizing, see Table 10.
5.In most installations, especially parallel
NOTE
If more load is added to the distribution panel, the unit’s cabling must be resized.
6.When laying power cables, do not form coils; this will help avoid increasing formation of electromagnetic interference.
NOTE
10