Grounding; Cable; Transfer Switch - Whisper Power GV4 Piccolo Installation Manual

3.6

GROUNDING

The AC alternator windings are not grounded.
The housing of the alternator and all other metal parts are
grounded.
It is necessary that the electric installation in the boat must be
protected against insulation failures. Methods of protection are
subjected to rules that can be different depending on the use of
the boat and local standards.
Experts in this field should be consulted.
To make a connection between "neutral" and "ground" is
necessary as part of a specific insulation failure protection
system. In the GV 4 this connection is NOT made in the factory.
Do not make this connection without installing this specific
insulation protection system!
3.7

CABLE

For the power cable we recommend the use of 4 wire three
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).
EN / M-GV4 Piccolo for marine applications / May 2017
3.8

TRANSFER SWITCH

A power source selector switch much be installed between the
PMG box 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 "land" (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.
Whisper Power recommends the installation of a Systemswitch
as the power source selector. This works automatically when
the generating set is not running the input remains in the land
line position and as soon as the generating set is running the
Mass Systemswitch switches automatically after 10 seconds
delay time over to the generating set position.
In all situations the transfer switches between
land line, inverter and Genverter should switch
both neutral and L1.
ELECTRICAL INSTALLATION (12 VOLT)
15