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MASTERYS BC 15-40 kVA - Ref.: IOMMASBCXX09-EN 01
2. UNPACKING AND INSTALLATION OF THE UNIT
2.4.1. Backfeed protection
If the UPS does not have an automatic protection device against current backfeed, the operator/installer must add a warning label
to all the mains power disconnecting switches installed at a distance from the UPS area. This serves to remind technicians of the
fact that the circuit is connected to a UPS (see the SAFETY section in paragraph 1 of this manual and paragraph 4.7.3. of the
EN62040-1 2009-05 standard).
The label is supplied with the system.
The backfeed protection device may be built into the system (only on specific request), or an electromechanical switch may be
installed externally in the input of the UPS.
• If the UPS incorporates this protection, proceed with the connections as described in paragraph 2.5 of this manual.
• To install the external backfeed protection it is necessary to use the BKF card and an external electromechanical switch that should
be installed . For further information on the connection and the type of remote switch, please read paragraph 9.7 of this manual.
WARNING
The neutral is not disconnected as, even in the event of a single fault on the UPS, it never has high potential when
the mains and/or auxiliary power supplies are disconnected upstream. This is to prevent transformation of the power
source to the UPS every time there is a power failure.
If under certain irregular conditions, or due to the installation upstream (e.g. undetected and protected earth fault, or
high leakage in a phase, or with IT systems) there is a hazardous potential on neutral, a suitable isolating switch must
be provided on the neutral as well, or else there must be a detection, signalling and protection system.
NOTE
For equipment with separate Emergency Mains, the neutral of the Emergency Mains line must be electrically common
with the neutral of the main input feed line.
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