Assuming their is two fuse spurs attached to dual back box and both are feed from separate circuits each of which are both feed by RCBOs, would this constitute poor design as both circuits would be earthing the same back box?
Thinking Out Loud
- Thread starter peterduckett
- Start date
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H
holmslaw
..
I forgot that RCBO are not directly fitted to the earth of the cable, though wouldn't a earth fault on one circuit also cause the RCBO to trip on the other as the earth would be connected via the back boxes
no. all the earths are at equal potential and all connected together back at the consumer unit. a fault from line (live) or neutral from one circuit to any earth or exposed extraneous conductive part should cause the relevent RCD / RCBO to trip.
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Ok sounds like its ok their must be a switch on my head that doesn't like two earth's from different circuits joined
It's not a problem.
Supplementary bonding in a bathroom requires the earth of every circuit to be joined together.
Supplementary bonding in a bathroom requires the earth of every circuit to be joined together.
P
Paul_C
Consider also the situation where metallic conduit is used as the means of earthing and contains two or more circuits. The earth will be shared by all circuits concerned.
really....!!??
i was told by an electrician (few weeks ago) rewiring a house that only the water mains and gas main pipe needs to be earthed now days.
becasue we where re piping the bathroom (1960s house) and asked if he wanted to get the earth cables up to the bathroom while we had the floor up.. and he said the above...
Was he fitting kitchens and bathrooms before becoming an electrician?
Supplemetary bonding was required under the 16th edition and still required depending on circumstances under the 17th edition.
Supplemetary bonding was required under the 16th edition and still required depending on circumstances under the 17th edition.
Under certain circumstances supplementary bonding can be ommitted in bathrooms under the 17th edn regs
//www.diynot.com/wiki/electrics:supbond17th
//www.diynot.com/wiki/electrics:supbond17th
what a odd question..!
no, it was a professional company hired by the house owners.
so he was wrong and this house isnt legal?
His 'global' opionion is wrong.
Sorry about the odd question - it was more sarcasm directed to some loosly called 'electricians'.
Sorry about the odd question - it was more sarcasm directed to some loosly called 'electricians'.
There are a couple of other criteria, but basically, if it is a brand new installation carried out to the 17th edition, then supplementary bonding may be omitted. If not, then it may still need to be installed.
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