- Impressed current cathodic protection system.
- Limited and locally earth systems, and
- Insulated monitoring devices with a maximum circulation current of 30 mill-amperes.
(5) Earthen distribution systems shall not be installed in any tanker, chemical tanker or gas carrier.
Provided that the natural of an alternating current distribution system with a line voltage of 3000 volts and above may be earthed if any current their from does not flow directly through and hazardous areas.
(6) The insulation of any distribution system which is not earthed shall be continuously monitored by a system capable of giving audible and visual indication of low insulation values..
(7) Every separate electrical circuit shall be protected against short circuit.
(8) Each separate electrical circuit other than a circuit which operates the ships steering gear or any other circuit in respect of which the Director General of Shipping grants an exemption, shall be protected against overload. There shall be clearly and permanently indicated on or near each overload protective device that current carrying capacity of the circuit which it protects and the rating of setting of the device.
(9) All lighting and power circuits terminating in a bunker or cargo space shall be provided with multiple pole switches outside the space for disconnecting all such circuits.
(10) Accumulator batteries shall be housed in boxes or compartments constructed to protect the batteries from damage and ventilated to minimize the accumulation of explosive gas.
(11) Electrical or other equipment which may constitute a source of ignition of flammable vapours shall not be installed in any compartment assigned to accumulator batteries.
(12) Accumulator batteries shall not be installed in sleeping rooms.
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