Published: 24 October 2008
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning the main meter conductors to a consumer unit, and phase loop test values, is answered by SELECT:
Question: I recently conducted a phase loop test on an existing installation and the value I got was 6.7ohms. Is this value low enough to allow a fault current to flow in order to operate the protective device? If not, what is the acceptable value?
Answer: Depending on the type of protective device, the maximum earth fault loop impedance values should comply with table 41B2 or 41B1 from BS7671 : 2001.
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https://www.voltimum.co.uk/consult.php?universe=consult.index.questions