lstoner said:if I don't get a shock, could I leave it ?
lstoner said:OK - one last question before I seek an electrician and get quotes etc.
In the last year, we had an extension built - new fuse box, wiring etc to the new build. However, we did not change the wiring in the old rooms ( hindsite is a wonderful thing !) The only way I can see of providing an earth is to run an earth wire of of a neighbouring [new] room light connection. This way I wouldn't have to feed new wire down to the switch - just run an earth from one room to another. Is this a big no no ( as mentioned by breezer ) ?
... and thanks again for your replies.
Do you have screwdrivers for dealing with screws?lstoner said:what could I use to test ? ( I have no meter )
Indeed it is common, but potentially dangerous. I'd never thought about this before, but someone brought it up on the IEE site.Damocles said:OK breezer, just why is this a no-no? I seem to recall it is quite common to interconnect earths on different circuits (i.e. bathroom!).
ban-all-sheds said:Indeed it is common, but potentially dangerous. I'd never thought about this before, but someone brought it up on the IEE site.Damocles said:OK breezer, just why is this a no-no? I seem to recall it is quite common to interconnect earths on different circuits (i.e. bathroom!).
By connecting them together you're providing parallel paths for fault currents. What if one path has a lower resistance than another? Care to think what might happen to the 1mm² cpc of a lighting circuit if it ends up carrying the lion's share of the fault current from a shower on a 50A MCB?
OK - in this case i's all lighting circuits, so no problem there, but generally.....?
ban-all-sheds said:By connecting them together you're providing parallel paths for fault currents. What if one path has a lower resistance than another? Care to think what might happen to the 1mm² cpc of a lighting circuit if it ends up carrying the lion's share of the fault current from a shower on a 50A MCB?
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