RCD Trip on non-live circuit
- Thread starter mrscalex
- Start date
Sponsored Links
there will always be a slight voltage difference between neutral and earth
on a TN system this is due to voltage drops on the cabling and devices before neutral joins with earth
on a TT system this is due to ground potential differences and voltage drops on the neutral wiring and devices
this causes a small current to flow in the even of a neutral-earth fault and this is often enough to trip a rcd
on a TN system this is due to voltage drops on the cabling and devices before neutral joins with earth
on a TT system this is due to ground potential differences and voltage drops on the neutral wiring and devices
this causes a small current to flow in the even of a neutral-earth fault and this is often enough to trip a rcd
Sponsored Links
i remember finding tht out the hard way. whilst workin on a house the wirin was bein done 1 room at a time, so the old wirin was temp connected to the new CU. then it came to the kitchen so the mcb was switched off and the live taken out (just incase). every so often the RCD would trip for no reason. after a few days of this i realised in the kitchen where the old sockets had been taken off my dad had left some copper pipe shortin the neutral and earth
Or just use DP MCBs....plugwash said:imcbs only isolate the live
its very tempting to stick some nice big isolators on rings for this reason
mrscalex said:
Don't feel a fool. (Unless, of course, you have the fool's permission!!) Many a spark has unwittingly tripped the RCD when working on a circuit he thought he'd isolated. Even when you know why, it somehow seems unfair!
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
Sponsored Links
