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Old 20 July 2005, 16:01   #11
Country: Ireland
Town: Dublin
Boat name: wizzard
Length: 7m +
Engine: 225 optimax
Join Date: Sep 2002
Posts: 835
Whereas as an isolator switch is good practice and important, switchs also help to reduce dramatically electrolliss, no matter how good your gear, your insulation etc, in damp wet conditions, there absolutly will be electrical leaks and stray current leaks to earth.People find this hard to accept, if you have a cut on a finger or wart, and I have felt this often, you can recieve minute shocks from the 12 v side of things, just as you would if you put a 9v battery across your tounge!!
And I dont mean from equipment, but things like steel steering rams, or metal on the boat, our last radio, Icom 401 , had a connection to the steel bracket on the handpiece so when it touched the negative on the rib, it reverted to ch 16, we disconnected the wire in the handpiece, and mounted it on fiberglass.A couple of inches maybe 5 or 6 away was a large metal earth on the boat, in soaking conditions, the current would track to this and the radio would factory go to 16.Just dampness caused this.
But having the switch off apart from helping to stop batterys going flat, theft etc dramatically reduces factors which can contribute to electrolis.If you have a batt switch and have bypassed this to connect the bilge pump, you may as well not have bothered fitting a batt isolator, as again in damp conditions you will have tracking from the pump, driving electrolisis and could still turn up to a flat battery


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Old 21 July 2005, 13:35   #12
Country: UK - Wales
Town: St Davids
Boat name: 6 vessels -various
Make: Quinquari/Humber
Length: 10m +
Engine: Twin ETEC200s
Join Date: Nov 2003
Posts: 130
Originally Posted by jwalker
John, do you mean the max distance to the main fuse/breaker must not be more than 200mm?


Daniel is correct in that it is any unprotected run, however the main from the battery to distribution board can be accepted but in this case double insulation should be provided. This can be achieved by conduit,spirwrap etc with self extingushing properties.

CE alows for the main to distribution to be non fused. In many cases a permanent live is also required for the autobilge.

If you have busbars to which your switched main runs to then the max distance from there on feeds to your switch panel/fuses needs to be 200mm or less.

Some deviation from the rules may be posssible provided that it is noted in the build file and if necessary on the vsl PLUS you can make a clear justification by tests etc.



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