Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning an electrical installation’s prospective fault current and compliance with the 17th Edition, is answered by the ECA:
The prospective fault current (at origin) = 230V divided by Ze.
The prospective fault current (for an individual circuit) = 230V by Zs.
If I have calculated the prospective fault current in this way, will I have covered the origin and 'every relevant point' in the installation, as required by Regulation 612.11 of BS7671: 2008 (the 17th Edition), and page 52 of Guidance Note 3?
And if so, would the answer for calculation of prospective fault current account for both short circuit and earth fault conditions, as required by Regulation 612.11 of BS7671: 2008?
Answer: Yes, you would have complied with Regulation 612.11.
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