Published: 20 June 2008
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, on the 17th Edition (BS 7671 - 2008) and whether a time/delay RCD should be used in a TT system as the main isolator, is answered by the ECA:
Question: On my recent yearly assessment visit, I was advised that to comply with the 17th Edition, I would still have to incorporate a time/delay RCD (on a TT System) as the main isolator, even though all the circuits were covered by 30mA RCDs and RCBOs. Could somebody explain why?
Answer: In order to comply with the 17th Edition, where addition protection is required, this needs to be provided by a 30mA RCD or RCBO.
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