spinner 0 Posted May 18, 2013 Share Posted May 18, 2013 you Need the main switch, and being double pole this will eliminate any stray currents form other boats so keep that and a RCD down stream of that, the Hot water cylinder should not be covered by the RCD as you will get nuisance tripping due to earth leakage. I would go for the same size element down sizing will just take twice as long to reach temp and end up using just as much power. Hope this Helps - I'm sure you Electrician will sort you out Link to post Share on other sites
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