TT earthing systems & protection against over voltage

by frambo5
Tags: earthing, protection, systems, voltage
frambo5 is offline
Nov22-11, 12:03 PM
P: 1
in a TT earthing system the earth fault loop impedence is high why ? do u need an RCD as well employed with a TT earthing system so as to cut the disconection time down?

In protection against overvoltage & undervoltage where is the contractor coil situated in the transformer or in the consumer unit (if thats how protection is provided)? ( i feel kinda retarded asking this question)
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