RCD Keeps tripping on new installation

[meow2222]

Might explain why the bulbs don't last very long.

NT

[Bill]

Lsd ?

>

[<me9]

But if N an E are connected upstream and downstream the neutral current will be shared between N and E. The L current will be the full amount so the RCD will see an unbalance.

[<me9]

With a single RCD for the whole installation it is then one circuit (with subcircuits) from that point. Tripping of that circuit will cause danger of no lighting. therefore an RCD supplying all circuits is non-compliant.

It is also not a good idea.

[<me9]

He must have lost his medication!

[<me9]

Circuits should be slplit to avoid danger.

Well you need two then, just like two combis.

[<me9]

What does that make you! Certainly not sane and intelligent.

[<me9]

I would agree that RCBOs can offer a better solution, at a *much* *greater* price.

[John Rumm]

True, however if you have an *additional* N to E short *after* the RCD, then you have a parallel neutral path around the RCD.

[John Rumm]

Indeed - and not often worth the expense IME. You can go for a pragmatic middle ground with "high integrity" 17th edition style CU[1]

Put any high trip risk circuits on RCBOs, then share others around the other two or three RCD groups.

[1]

[The Natural Philosopher]

Put the whole house on 100mA RCD and then use 30mA RCBOs for selected sockets

[meow2222]

Yes, solely because there's a N-E fault downstream.

NT

[ARW]

I don't believe there is much of a hazard with only one RCD but there is an inconvenience.

[Tim Watts]

That does not meet the 17th edition.

Any cables less than 50mm below a wall/partition surface and not mechanically protected require a 30mA/40mS RCD:

522.6.6 - Defines mechanical protection 522.6.7 - Requires RCD where above is not met, references 415.1.1 415.1.1 - Stipulates RCD with 30mA trip and operating time not greater than 40mS at 150mA

[ARW]

I think the word "shall" has a similar meaning to the the word "shall"

And your point is?

[Dave Plowman (News)]

Quite. But there are lots of makers just as good or better than Wylex.

[charles]

Not an electrical hazard, I agree - but if all the lights go out when it's dark, there is likely be a hazard in the occupant negotiating their way to the CU.

[Doctor Drivel]

Being in the dark is NOT a hazard. There are battery backup lights for being in the dark. An electrical hazard means harm by electricity.

An RCD is the last line of defence to prevent bodily harm.

What if a digger rips up the cable in the road!!!

British Standards are RECOMMENDATIONS. The Building regs are LAW. Even the building regs are full recommendations as well.

I wouldn't hire you.

[Doctor Drivel]

This man is senile.

[Doctor Drivel]

This one is an old hippy.