Proper weird fault

[RF Lighting]

I've had to video this one it's so odd.

It's a newly wired RFC in surface steel conduit.

There is no sign of any damage to the installation, and line, neutral and earth all test >1000MΩ at 500V



I reckon I've sussed it but can you?

 

[Steve]

Thats an odd one! Did that combination take some finding?

 

[Spark123]

Someone peeved off at having their computer constantly switched on and off so they have attacked the sockets, only when you turn off the lights they stopped

 

[RF Lighting]

There is no load at all on the socket circuit

 

[electronicsuk]

The RCBO has a functional earth that's not been connected correctly to the earth bar? Perhaps I'll come up with something better if I sleep on it...

 

[RF Lighting]

Nope, functional earth is connected to the earth bar, and the Zdb is 0.18Ω


I'll give you a clue tomorrow if no one has got it

 

[cumbriahandyman]

buzzbar?

 

[RF Lighting]

What does that mean?

 

[Spark123]

Normal or filtered sockets?

 

[electronicsuk]

Some sort of timed load on the LH side non-RCBO circuit with a borrowed neutral from the RH side RCBO protected way? For example, a PIR light that will draw a reasonable load for 30 seconds or so after power being applied, after which the load current is no longer large enough to prevent the RCBO resetting. Otherwise, I give up.

 

[RF Lighting]

Just 5 bog standard twin metalclad sockets, and an FCU for a CH boiler, but the boiler is not yet installed.

There are no borrowed neutrals. They are both new circuits.

 

[Spark123]

What's the other circuit for? How is it installed?

 

[RF Lighting]

The other circuit does the lights in the same room.

There's a couple of temporary CFLs, a couple of HF 2Ds, an emergency brick light, and an external SON wall pack with photocell.

It is installed in the same conduit as the RFC.

I reckon Mr. 123 is getting warm

 

[martinxxxxxx]

There is an induction loop in one side (l or N) in the first circuit (the one that won't set) being induced from the second circuit, which is causing an imbalance in the current flow on the Live Neutral of the first circuit.

Martin

 

[sparkydude]

As you said it is installed in the same conduit, is their an induced voltage or current in the RCBO protected circuit from the lighting cct as it only happens when the lighting circuit is turned on ?????