Published: 17 December 2010
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, about a caravan park's circuit protection arrangements, is answered by the NICEIC:
Question: The main electrical supply to a caravan park with 24 hook-up points (all individually protected by 30mA RCDs) is protected by a 30mA RCD. This main supply RCD regularly trips - usually after significant wet weather, but none of the hookup points ever trip.
Can I fit a 300mA RCD (does discrimination work with RCDs?), or can the main supply be non-RCD protected given that the hookups all have 30mA RCDs?
Answer: You could fit a 300mA time-delayed RCD to give discrimination. It would depend where the TN-C-S earth separation occurs as to whether the main supply can be non-RCD. In needs to be asked why wet weather trips the RCD?
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