Chapter 2 - Installation
UPStation GXT 3x1
Page 4
(06/02)
2.4
Electrical installation considerations
This UPS must be installed by competent electrical personnel and wired in accordance with local/national electrical
codes.
The following information is provided for your guidance.
IMPORTANT
EARTH CONNECTION IS ESSENTIAL BEFORE CONNECTING THE MAINS SUPPLY. Earth in accordance
with local electrical codes.
CAUTION
This UPS is fitted with EMC suppression filters. Earth leakage exceeds 35mA. Transient and steady state earth
leakage currents, which may occur when starting the UPS, should be taken into account when selecting instantaneous
RCCB or RCCD devices. Note also that the earth leakage currents of the load will be carried by this RCCB or
RCCD.
CAUTION
This UPS does not incorporate automatic backfeed protection.
A warning label must be fitted to all primary power isolators stating:
ISOLATE UNINTERRUPTIBLE POWER SYSTEM BEFORE WORKING ON THIS CIRCUIT.
On start-up, the UPS will take a half cycle inrush current of up to 6 times the rated current. This must be taken into
account when selecting the overload protection device at the input mains supply distribution point. To avoid random
tripping on start-up, we recommend that the input mains supply be protected with an MCB capable of withstanding this
initial inrush. An MCB specified as being “TYPE 4” (British standard) or “CURVE D” (IEC standard) is suitable for
this purpose.
The mains input supply cable must be connected to the UPS via a wall mounted double pole circuit breaker, rated to
carry the current and be capable of breaking the maximum prospective short circuit current of this branch circuit. The
breaker is to be mounted within two metres of the UPS and be readily accessible to the operator.
2.4.1
Electrical Connections
The UPS is supplied with an input/output/ battery terminal block assembly on the rear of the UPS within a cable box
(see outline drawing). The cable box can be removed to enable knockouts to be removed or new holes drilled, to secure
the cables
.
The cable sizes and distribution methods used during installation are subject to local/ national electrical codes of
practice , and therefore are not detailed here. The following tables detail the standard current ratings. The UPS rating
plate gives details of the current ratings for alternative output voltages.
The terminals will accept wire sizes up to the values below:
Model
Cables sizes
INPUT CURRENT Amps max
Including mains variation/battery charge
normal mode: 8A
GXT3x1-6000
10 mm
2
bypass mode: 26A
normal mode: 11A
GXT3x1-8000
16 mm
2
bypass mode: 35A
normal mode: 13A
GXT3x1-10000
16 mm
2
bypass mode: 44A
