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:
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| Impedance tester - but what min. earth loop value? |
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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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Related contacts
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The Electrical Contractors' Association (ECA)
ECA Head Office, ESCA House,
34 Palace Court, London W2 4HY
Tel: 020 7313 4800
Fax: 020 7221 7344
Email: electricalcontractors@eca.co.uk
Web: www.eca.co.uk |
ECA
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