I'd like to spur an external socket from an internal circuit. The internal circuit is protected by a 30mA RCD at the CU, so I'd like to put a 10mA RCD on the spur between the internal ciruit and the external socket. Any idea where to get such a thing, ideally in a form that would fit a 1g metal box?
Hi Lensman Take a look at this link http://www.tlc-direct.co.uk/Technical/Accessories/RcdSockets/RcdSockets.htm Why do you want 10 mA, it wont discriminate with 30mA I.E. a fault on the 10mA will almost certaintly trip the 30mA, and very expensive. Tony
Why do you want 10 mA, it wont discriminate with 30mA I did indeed want it to discriminate to avoid shutting down most of the house (hence why I asked about 10mA since the main CU is 30mA). What would discriminate?
you don't have much hope of achiveing discrimination with a 30ma non delay rcd upstream a 10ma might do it but then it might not and 10ma rcd spurs are hugely expensive i only found one source http://www.loblite.com/acatalog/Online_Catalogue_RCD_Spur9.html. at £82! and there is still no saying wheter it will discriminate i think the only reasonable soloution is to deal with this at the cu if you have a split load cu and a spare slot the most sensible option imo would be to run the outside socket directly from a 16A 30ma rcbo at the cu if you have a non split cu with 2 neutral bars and 3 slots spare you can probablly convert it to split load with a kit from the manufacturer then do as above failing that you have two options 1: replace your cu with a split load 2: split the tails and run a small rcd cu just for your outside socket rcds of any rateing other than 30ma seem to be both hard to get and expensive
Thanks for the advice guys - especially saving me some wasted time and money setting up a 10mA connection. I've got plenty of spare ways in my CU, so I'll just put in another RCBO and run the socket cable directly from that.
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