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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Question on isolated ground posted by Glen on December 13, 1999 at 12:26:40:
I believe that your system most approximates what is shown in figure 8 of the excellent reference Glen provided (link below). Your ground is a)not isolated and b)has an alternate path to earth ground (the new rod) which can prevent the circuit breaker from tripping in the event of a line fault. In the picture shown in figure 8, just move the new earth ground shown at the panel box back to the outlet and you'll have an example of what your electrician did for you and see why it's unsafe. Also in the very rare event that your main house ground got disconnected (as in shit happens) and then you had a fault anywhere in the house, you could end up with the very undesireable situation of all of the fault current trying to get to ground via that single 12 gauge wire hooked to your auxilliary ground rod.....not a very pretty sight.
Probably the best thing to do is reprint the article that Glenn suggested and show it to a qualified electrician. If he/she doesn;t understand it or tries to give you an alternate plan, you need to find another electrician. Fixing the problem will involve running a metal conduit (I'm not sure if armored cable is acceptable) and fixing the auxiliary ground rod which the last guy installed by bonding it with heavy wire to the main house ground.
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Follow Ups
- Look at figure 8 - Batman 11:03:22 12/15/99 (0)
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