Just in from Square D [RE-wrenches]
Drake Chamberlin - Electrical Energy
solar at eagle-access.net
Sun Mar 11 08:27:25 PST 2001
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>>.
>
>A 2 pole breaker is safer than a single pole one, because one of the
>supply terminals (upstream of the breaker) might accidentally become
>grounded at source without being noticed. Whichever one became live
>(hot?) would then be protected. I always assumed this was the reason for
>requiring a 2 pole breaker. If there is another reason, I'd be
>interested to hear it.
Part of the reason is the in the US, our National Electrical Code requires
that all ungrounded conductors have overcurrent protection. I don't know
how this would apply to British systems.
>I like ungrounded systems where there are 120V battery terminals to work
>on. But I suppose it would be safer to treat them all as potentially live
>(hot).
I think we would have trouble getting past an inspector with one of these
systems here, unless it was an industrial application. The electrical
worlds we deal with are quite different. I was fascinated with the
electrical installations in Wales when I was there in 99.
Drake
>--
>Hugh
>
>Scoraig, Scotland
>http://www.scoraigwind.co.uk
>
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For info contact list moderator by email:
michael.welch at homepower.com
____________________________________________________________
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Newsletters, Tips and Discussions on Topics You Choose.
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