Discuss 2 RCD's - are they needed in the UK Electrical Forum area at ElectriciansForums.net

pdab09

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Hi I’m looking for advice on the following: I’ve yet to contact my local council about installing a light in Zone 1 of my bathroom (this due to height restrictions) but reading up on it in order to get ready for the off I thought it wise to check out my understanding / intentions first. The light will be a LED, 240v (built in driver), IP65, Class 1 fitting. For this I understand it’ll need to be protected by a 30ma RCD.

My question is as follows: My domestic consumer unit has a 100A, 30mA RCD main switch and the 2 x lighting circuits each have 6A MCBs. When I put the new light in I intend to take a feed off one of the lighting circuits (which has just 7 lights on it totalling about 120 watts) and run it via a passive fused spur box with a 30mA RCD built in and fitted with a 1 amp fuse. This will be located in studwork outside of the bathroom as will the on/off switch. This effectively means I’ll have 2 RCDs serving the light – 1 on the consumer unit mains in and another RCD on the lighting sub circuit serving the new bathroom light only. Am I on the right track with this or can I rely on just the main 100A / 30mA RCD? Having did a stint as a spark’s mate (back in the 1960’s) I’m OK with running it in and connecting but want to be sure of complying with the regs which are in force. Thanks in advance.

(Apologies if this posted twice - can't find my first post so trying again!)
 
Welcome to the forum mate.
As above, the RCD in the consumer unit will be fine.
 

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