Boiler

[jonny1]

A friend of mine has a split load CU with the boiler circuit on the non
RCD side. when the boiler itself is turned on it trips the RCD? Is there a problem with the boiler? Should it still trip the RCD?

 

[breezer]

is it on its own mcb? sounds like the neutral is connected to the rcd neutral, not the non rcd neutral

 

[ricicle]

If the boiler supply is on it's own circuit then it is quite possible the Neutral is in the RCD protected Neutral thus causing an imbalance in the RCD coil.

EDIT: Pah!.......too slow

 

[jonny1]

it has its own mcb, would you say it wouldn't trip out if the neutral was on the non rcd side?

 

[breezer]

yes.

and rcd works by detecting an imbalance, hence check where the neutrasl is connected to

 

[jonny1]

ill check where they have connected the neutral. cheers.

 

[securespark]

I've had the problem of stuff on the non-RCD side of the CU tripping the RCD even when neutrals are correctly parked.

Pesky TN-C-S systems...

 

[Paul Barker]

What do you put that mechanism down to securesparks?

 

[Lectrician]

What do you put that mechanism down to securesparks?

Pesky TN-C-S systems





I have also some fun with RCD's tripping when appliances on the non-rcd are used.......between buildings on seperate supplies too!

 

[jonny1]

It was the neural that had been put on the RCD side. is it something inside the boiler that causes an imbalance?

 

[fireman22]

well no, its just that there is an imbalence through the rcd
in that there is more current coming back through the neutral than going out on the live, if you understand