Agreed-For the sake for a minute, and a few inches of cable- why would you not?I'd put a flying earth on it regardless. Good practice?
so if most people do earth the back boxes do u all still supplementary bond even tho u dont have to under the 17ththere is NO requirement anywhere to earth the back box on a flush mounted accessory.as long as you provide an earth to any exposed conductive part(ie, the screw, earth provided via brass insert).
waste of time, Im not going to get into the reasons why I think this unless someone really wants to know.!
NOso if most people do earth the back boxes do u all still supplementary bond even tho u dont have to under the 17th
to be honest i agree with uNOand
NO,
never have earthed back boxes, except under SR,
waste of time.
only supp bond where required, or on SR.
why do what your not paid to do?
good workmanship is NOT about wasting your time or doing something that has absolutely no bearing on the safety of the installation,
and I would like to read ONE reasoned arguement as to why tagging back boxes is of benefit.
rubbish! if flush mounted then its not exposed or extraneous.!Good to think about these questions, my take is that the metal back box (whether for a surface-mounted or flush-mounted accessory) is an exposed conductive part and therefore is required to be earthed. The sparky has to decide whether or not the in-house earthing (adjustable lugs, earthing strap, screw eyelets) on the socket-outlet could be compromised and thus whether or not to add an earthing tail.Whether or not there is RCD protection is not relevant, you would earth as a start and then use an RCD for additional protection in case the earth connection is/becomes ineffective.
Supplementary bonding is required under the 17th in certain conditions. See Reg. 701.415.2 e.g. in a TT system
Please would someone point out if I've spouted rubbish and :S
Blushing
Guiness Drink
'evans above, why would you want to do that now????Reply to TT bangbang, I would'nt say the flush box was exposed conductive metalwork,.Wish I had thought of a barmy name now !!
Deke
thats why RCDs were used, but as now we have to use 30mA to comply with 17th then TT is covered also.eeek!NICEIC say a 'metal back box for a flush-mounted socket-outlet is deemed to be an exposed conductive part (even though it may not be able to be touched).' Their highlighting. Mustn't slavishly believe everything they say I guess
I thought that as disconnection times cannot be met in a TT system then supplementary bonding had to be present?
Learning all the time Blushing
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