24 volt DC Services, two wire insulated return. 12 volt DC Services, two
wire insulated return. 220 volt AC, 1 phase, 50Hz, 3 wire with neutral
earthed but non-hull return.
All cables, switch gear and ancillary equipment supplied and installed as part of the
electrical installation should, wherever practical, have a marine "Type Approval".
The DC electrical system shall be a 2-wire negative ground, 24 volt system with one
bank of batteries supplying power. These batteries shall be charged from engine driven
alternators, from shore power or the AC generator through battery chargers.
The AC system shall be a 220 volt, single phase, 50 Hz system with power supplied by a
diesel driven generator, from battery inverters or from a shore power connection. These
systems shall be installed in general accordance with the wiring schematic developed
with the final plans.
10.2. Drawings and Documentation
Detailed installation drawings to be provided where applicable and will include:
Single Line Cabling Diagrams.
Detailed Circuit and Connection Diagrams.
Equipment Locations, Layouts and General Arrangements.
Switchboard and Control Panel details.
Equipment Lists, Cable Schedules and System Descriptions.
Test and Commissioning Schedules.
10.3. Name Plates
All distribution panels, alarm panel and switchboard shall have nameplates to clearly
identify the circuit or unit of equipment, and should include the fuse size or circuit
breaker rating where applicable. All push buttons, switches, and receptacles shall be
clearly labeled either on the mounting plate or with a suitable label plate adjacent.
10.4. Electrical Supplies and Reticulation
Circuits and sub-circuits will be protected on all un-grounded current carrying
conductors against over currents and short circuits by circuit breakers where practical or
suitably rated fuses.
Circuit beaker and fuse ratings will provide adequate fault rupturing capacity,
discrimination, and be a type suitable for marine use.
Instrument and control circuits are to be protected.
Adequate suppression will be fitted where there is a risk of transient voltage spikes.
10.5. Wiring, Supports and Bonding
Wiring
Wiring will be suitable marine type.
Wiring voltage ratings must be suitable for the circuit, conductors must be stranded
tinned copper.
Wire color coding to conform to the European standard.
37
