Conductor cross-sectional areas must be such that the volt drop does not exceed 6% at
the maximum load.
All wiring will be adequately protected against mechanical damage, chaffing, heat,
corrosion and wherever possible installed clear of bilges.
Wire penetrations through bulkheads and decks will have adequate sealing
arrangements to maintain watertight integrity.
Wiring will be identified at each end using a proprietary permanent marking system.
The details are to be recorded on the cable schedule and referenced on the appropriate
drawings.
Supports
Main wiring runs are to be neatly fastened to 100 x 40 or 50 x 40 plastic cable trays.
Cables run out to other areas must all be adequately supported and fastened with small
diameter flexible conduit.
Bonding
To minimize electrolysis due to electric leaks and for personnel protection, an electrical
ground shall be installed, consisting of a 100mm wide copper strap along the inner skin
and connected to an external grounding plate below the waterline in the keel trunk. The
following shall be connected to this ground:
Propulsion machinery
Metallic enclosures of all electrical apparatus, motors, pumps etc.
Electronics equipment (including SSB coupler).
Ground leak detection bulbs are to be provided for 12 volt, 24 volt and 220 volt busses, in
accordance with the Wiring Diagram.
System to be coordinated and approved by Electrical Contractor, Electronics Supplier
and Architect.
10.6. Lightning Protection
Lighting protection system to be designed in cooperation with the Electrical Contractor,
Builder and Spar manufacturer.
10.7. AC Power Supplies
The AC installation will be 220 volt AC, 1 phase, 50Hz, 3 wire with neutral but non hull
return.
AC supplies will be from either the generator, shore power or inverter.
Selection of either generator or shore power AC supplies will be by manually operated
switch. The inverter is automatically available to selected services in the absence of AC
mains.
Earth fault monitoring of the AC system will be provided.
AC Generator
Refer also to Section 8, “Machinery”.
One Fischer Panda Model “PMS 14000NE” 12 kW single phase generator, 230VAC, 50
Hz at 3000 rpm to be installed to provide standard single phase 230VAC, 50 Hz service.
Generator set fitted with a 12 volt electrical system.
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