Whisper Power M-SC6 Installation Manual page 17

2 GROUNDING
The AC alternator windings are not grounded.
Measures against earth insulation failures are often
subject to local regulations. The housing of the alternator
and all other metal parts are grounded. For safety reasons
connect the main ships ground to negative point of the
generating set start battery. When an ungrounded return
DC system or positive grounded DC system is applied the
battery negative should not be connected to the main
ships ground.
To make a connection between "neutral" and "ground"
could be necessary as part of a specific insulation failure
protection system.
Small pleasure craft in Europe is submitted to The
Recreational Craft Directive 94/25/EC. The guidelines of
this directive refer to (ISO 13297).
When the installation comply to this standard the "neutral"
and "ground" should be connected on the generating set
by connecting the blue (neutral) wire with the terminal on
which the yellow/green wire is connected.
WARNING
In all situations the transfer switches between
shore, inverter and generator should switch all
connections, the phase line (L) as wel as
neutral (N). Of course this is the case when
using a Whisper Power Mass Systemswitch
Be aware that insulation protection systems can be
different for different applications and even within the ship
there could be different standards for different spaces. We
did refer to the Recreational Craft Directive that applies to
pleasure craft up to 24 m of length. Sometimes one has to
comply with other standards such as the rules of
certification societies like Lloyds Register of Shipping or
Veritas, regulations for the protection of personal, building
EN / M-SC 6/8/10 - 3000RPM / December 2010
legislation, etc. It is of the greatest importance to have
expert advice on this issue.
For safety reasons connect the main ships ground to
negative point of the generating set start battery. When a
ungrounded DC system or positive grounded DC system is
applied the battery negative should not be connected to
then main ships ground.
3 CABLE
For the power cable we recommend the oil resistant cable
with the following cross sectional area:
Model
M-SC 6 – 3000 rpm
M-SC 8 – 3000 rpm
M-SC 10 – 3000 rpm
For very long cables it is recommended to apply cables
with a larger cross section than the mentioned above.
4 TRANSFER SWITCH
A power source selector switch much be installed between
the generating set and the ship'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 shore to ship 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 chattering.
Whisper Power advises the installation of a Masterswitch
as the 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 automatically after 10
seconds delay time over to the generating set position.
INSTALLATION
cross sectional area
3x4 mm² (5m. included)
3x4 mm² (5m. included)
3x10 mm2 (not included)
17