Earthing heaven or hell?

[Tintin]

Skin fittings should not be bonded to anything, or even to each other,

A sad case a year or two back where a mobo sank in its marina berth due to failure of a skin fitting which was almost certainly the result of electrolysis caused by a connection to a bilge pump negative. Also one of the factors in the near loss of the FV Random Harvest

Anodes must be bonded to the items they are required to protect. This will often mean that anodes, DC negative and shorepower earth will all be interconnected. one must then be sure that the anode wiring is not also a current carrying connection for the DC system.

Thanks Vic.

 

[ianj99]

V interesting. Is it large, is it expensive? Got a make to recommend?

I have a BT1631

http://www.airlinktransformers.com/boating_transformers/

Its about 10" x 10" x 8" so very compact. Withstands short overloads as well when I have the microwave and heating on at the same time! (or a Philips airfryer - brilliant alternative to an oven or grill and quick too + microwave)

Ian