14 EN / MOBILE WHISPER 6/12-6/8/10/12/16 ULTRA / November 2004
INSTALLATION
circuit in the on-board electrical system is properly
installed by a qualified electrician.
1 Fuse
An input fuse (from the generating set to the system)
should be installed to protect the installed electrical
system. For the Whispers the maximum single phase
current at 230V is 25A (W 6), 32A (W 8), 40A (W 10),
48A (W 12) or 75A (W 16).
The fuses must be of the slow reacting type. For elec-
trical motors connected to the system, a motor pro-
tection switch must be installed.
2Insulation failures
The AC alternator windings are not grounded.
The housing of the alternator and all other metal parts
are grounded.
To make a connection between “neutral” and “ground”
could be necessary as part of a specific insulation
failure protection system.
It is possible that the electric installation in the vehicle
must be protected against insulation failures.
Methods of protection are subjected to rules that can
be different depending on the use of the vehicle and
local standards.
In the standard marine manual is more information,
but this is according CE regulations for boats.
Vehicles are subject to different regulations
depending on the application of the vehicle. Experts
in this field should be consulted.
3 Cable
For the power cable in single phase installations we
recommend the use of flexible 3 wire oil resistant
cable with a sufficient cross sectional area. One wire
for earth is included. For very long cables it is
recommended to apply cables with a larger cross
section. Refer to the installation specifications to
select the proper cabling (page 34).
4Transfer switch
A power source selector switch much be installed
between the generating set and the vehicles 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 shore 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.
Mastervolt advises to install a MASTERSWITCH as a
power source selector. This works automatically when
the generating set is not running the input remains in
the shore position and as soon as the generating set
is running the masterswitch switches over automati-
cally after 10 seconds delay time to the generating
set position.
Warnings:
In all situations the transfer switches
between shore, inverter and generator
should switch both neutral and L1. Of
course this is the case when using a
Mastervolt Masterswitch.
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