Published:
27 November 2008
Category:
Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning Ze external loop impedance testing, is answered by the NICEIC:
Question: I seem to read conflicting requirement about the Ze external loop impedance test. Please clarify whether this test is to be carried out with the supply cable LIVE or DEAD. I know that the consumer side would be shut down and isolated when doing this test.
Answer: Ze can be measured using a proprietary instrument and the correct test leads - to do this the supply cable must be LIVE. As live measurement is being undertaken, appropriate safety precautions shall also be taken to avoid danger.
Alternatively, a nominal value of Ze can be obtained by enquiry from the local electricity company.
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