Battery Over Current Protection And Wire Sizing - GE Digital Energy LP 33 Installation Manual

Uninterruptible power supply

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Fig. 3.7.2-1 RPA Parallel System

No transformers, fuses or automatic circuit breakers should be inserted

between the unit's output and the load common bus-bars.

3.7.3

Battery over current protection and wire sizing

•

Please read the safety precautions at the front of this guide carefully, and thoroughly review

the battery manufacturers installation and maintenance manual before connecting the

batteries to the UPS.

•

If the UPS system has been purchased with an accompanying battery cabinet, that cabinet

should have an integral battery circuit breaker.

If the UPS has been purchased without a battery cabinet or remote rack mounted batteries are

to be used then DC over current protection must be provided by others.

•

Choose an appropriate DC fuse or circuit breaker using the current data in the chart below.

•

Minimum battery cable requirement is based on the current data below.

OPM_LPS_3UI_10K_20K_0US_V010.doc

In order to ensure a correct load sharing

between the parallel units, when the load is

supplied by utility, it is recommended to

keep the cable size and length from the

input distribution board to the output bus-

bar the same for each parallel unit.

Utility Bypass input voltage must be the

same for all units, thus avoiding phase shift

or phase rotation problems.

To avoid mutual induction effect, the input

cables bust be run in separate conduit from

the output cables.

Installation Guide LP 33 / 10 - 20 kVA

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