Published:
12 September 2014
Category:
Q&A
Colin asks this question, which is about the possible need for three-phase socket protection via RCD. It has been answered by the NICEIC (Theme – Regulations and Legislation):
This Q & A is one of thousands posted in our Technical Expertise area, and answered on a daily basis by our Voltimum Experts.
Question: Can you please advise whether it is necessary to provide RCD protection for a 16A three-phase socket in circumstances where it is not certain that an ordinary person will not use the socket?
Answer: The Wiring Regulations (BS 7671: 2008) state in Regulation 411.3.3 (I): ‘socket outlets with a rated current not exceeding 20A that are for use by ordinary persons and are intended for general use, must be RCD protected’.
However, a three-phase socket outlet is not intended for general-purpose use and is not likely to be used by ordinary persons.
Therefore, judgment must be used, and if there is a likelihood that ordinary persons are indeed going to use this arrangement with three-phase appliances, it may be prudent to provide additional protection.
But it is not a formal requirement as per the regulations.
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