Whisper Power W-SQ 27 kVA / 25 kW Installation Manual page 15

2.5.5.2 Fuse
An output fuse (between the generating set and the electrical
installation) should be installed to protect the installed
electrical system.
Using three phases the fuses should be three times 36 Amps
and mechanically connected. The fuses must be of the slow
reacting type. For electrical motors connected to the system, a
motor protection switch must be installed.
2.5.5.3 Grounding
The AC alternator windings are not grounded. The housing of
the alternator and all other metal parts are grounded. Making a
connection between "neutral" and "ground" is necessary as
part of a specific insulation failure protection system.
The electric installation in the vehicle possibly needs to be
protected against insulation failures. Methods of protection are
subject to rules that may differ depending on the use of the
vehicle and local standards. Experts in this field should be
consulted.
W-SQ 27 kVA / 25 kW — October 2014 — EN
2.5.5.4 Cable
For the power cable we recommend the use of 5 wire tri-phase
oil resistant cable with a sufficient cross sectional area. One
wire for earth is included. For long cables it is recommended to
apply cables with a larger cross section (refer to ISO 13297
annex A).
2.5.5.5 Transfer switch
A power source selector switch much be installed between the
generating set and the vehicle's electrical supply system. This
switch must ensure that all AC consumers can be switched off
at once. This switch should also be installed to keep the
generating set and shore (grid) power systems separate.
Transfer switches - to switch over from a land line to vehicle or
from generating set to inverter - should be well designed to
switch over all wires including neutral (and not only phases or
line) and there should be provisions with the aid of timers to
prevent relays from clattering.
INSTALLATION
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