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Earthing On Boats.
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<blockquote data-quote="septiclecky" data-source="post: 353134" data-attributes="member: 1561"><p>Well it's not TT, TNC or TNC-S for a start.</p><p></p><p>Ships normally don't have a neutral to get 230v it is derived from 3 phase 400-230 step down transformers.</p><p></p><p>Sounds daft but when I was at sea never knew a fuse/mcb to go on a earth fault even when the was a full earth.</p><p></p><p>Earth faults where shown on the main switchboard by 3 lamps, when all was OK all 3 lamps would be half lit but when a earth fault developed on a phase the other 2 would increase in brightness whilst the phase with the earth fault would go dimmer</p></blockquote><p></p>
[QUOTE="septiclecky, post: 353134, member: 1561"] Well it's not TT, TNC or TNC-S for a start. Ships normally don't have a neutral to get 230v it is derived from 3 phase 400-230 step down transformers. Sounds daft but when I was at sea never knew a fuse/mcb to go on a earth fault even when the was a full earth. Earth faults where shown on the main switchboard by 3 lamps, when all was OK all 3 lamps would be half lit but when a earth fault developed on a phase the other 2 would increase in brightness whilst the phase with the earth fault would go dimmer [/QUOTE]
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