scope:

General

This standard applies to the HV electrical system onboard Royal Navy & Royal Fleet Auxiliary vessels. By definition the electrical system comprises all equipment for the production, conversion, transmission storage, distribution and use of electrical energy.

Types of Enclosures

The Ingress Protection (IP) rating of HV electrical equipment is to be such that it is to take into account Naval fire-fighting techniques, and risk of flooding that may take place in compartments containing such equipment. (Reference BR2170 Ships NBCD Manual). Therefore the IP ratings of HV equipment in MMS is to be at least IP56.

Pipework in the Vicinity of HV Equipment

Pipes installed in the vicinity of HV equipment are to be continuous and joints or similar are not permitted if failure of the joint would result in direct impingement of liquid on the equipment. If unavoidable, additional screening of pipes and fittings will be required in order to protect the main switchboard against splash by leakages. Such screening is to be provided with drains and alarms, if necessary.

CCTV Monitoring

All HV spaces are to be monitored by the use of CCTV. The monitoring is to be available in, and controlled from, the Ships Control Centre (SCC) / Main Machinery Room (MMR).