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- 17 Jan 2005
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I have a ring main that's protected by an MCB and an RCD. With the RCD set and the MCB off there's a very low resistance between phase and earth (around 10 ohms). Why might this be?
The reading was taken at the site of a socket on the main; and the socket was removed, so the ring was also broken at that point.
The reading was taken at the site of a socket on the main; and the socket was removed, so the ring was also broken at that point.