Published: 29 August 2008
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning earth loop impedance testing between phase and earth mains, is answered by the ECA:
Question: I carried out an earth loop impedance test between phase and earth mains using an earth loop impedance tester made by Megger. The value I got was three ohms. My question is: what is the minimum earth loop impedance for a domestic installation with a mains cable size of 16mm2.
Answer: The value should be checked against the tables in BS 7671 and the protective device being used.
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