Electrical Wiring - GE LP 33 Series Operating Manual

4.7

ELECTRICAL WIRING

WARNING !
The connections to and from the UPS must be executed by QUALIFIED PERSONNEL
ONLY.
Refer to the "Safety prescriptions - Installation" described on Section 1.
The cabling of the UPS-system has to be done according to the power installed.
Exceptions are only allowed to suit local prescriptions.
For correct rating of fuses and cable sections for input mains, output load and battery, see data
indicated in sections 4.7.2 and 4.7.3.
Before connecting the UPS, verify that the mains voltage and frequency, the output load voltage, the
frequency and the battery data (cells number, floating voltage, autonomy) are according to the local
requirements.
Protection of the UPS mains input, must be exclusively with 3 pole breakers.
The UPS needs the connection of the Neutral to the input, to guarantee the function in TN mode.
Caution when using four-pole circuit breakers as protection to the load of the UPS.
A potential problem exists for situations with non-linear loads: the neutral current could be greater
than the phase currents.
Avoid to run the input cables in parallel with the output cables to prevent them from noise induction.
Mains Input
Load
Fig. 4.7-1 RPA Parallel System
NOTE !
No transformers, fuses or automatic circuit breakers should be inserted
between the unit's output and the load common bus bars.
The delivery and installation of fuses and input / output connections of the UPS are at the
customer's expense, unless agreed otherwise.
NOTE !
In case of non observance of the required minimum distances on both UPS sides (see
section 4.4) it is recommended to provide an additional length of the input/output
cables so that the UPS can be moved for maintenance purpose.
It is recommended to use flexible input/output conductors with suitable length to
admit a sufficient displacement.
Modifications reserved
OPM_LPS_33E_10K_30K_4GB_V030.doc
In order to ensure a correct load sharing between
the parallel units, when the load is supplied by
mains, 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.
Mains 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.
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Operating Manual LP 33 Series / 10-20-30 kVA