New build fuse issue

Reati

Howdy folks,

I have a problem where something trips my main fuse breaker and cuts power to entire house. Note its a new build.

It's very intermittent. Once in last 6 months then twice in a week. The last time it happened I only had the bare things on. I.e fridge, heating system (air source pump) well pump, house alarm etc I've googled but none the wiser. What would be the best way to diagnose the issue or will I just call the electrician back?

I've not much to go on i know.

Skihunta13

Can you post a photo of the decice that trips?

brightspark

post a pic of your distribution board and what is tripped.

(Skihunta13 bet me to it)

Reati

Sure of course, Attached.

That's the only one that trips the rest don't.

kramer1

Any chance of a picture of the whole board?

meercat

Something not right. That shouldn’t control whole house
Any chance of photos of full board

meercat

kramer1 wrote: »

Any chance of a picture of the whole board?

Beat me to it

salmocab

When that trips does everything go including lights etc?

Skihunta13

That RCD should only control the sockets, immersion. Your lights should not go off when that trips.
Possible causes are 1. faulty RCD (unlikely) 2. Faulty appliance ( most common here is water in the base of kettle) 3. A neutral earth fault most likely caused by the screw of socket nicking the neutral cable.
Very hard to find when its an intermitting fault. Probably best to get electrician back to retest. The original test results could probably point to which circuit was close to breaking down.

Reati

Skihunta13 wrote: »

That RCD should only control the sockets, immersion. Your lights should not go off when that trips.
Possible causes are 1. faulty RCD (unlikely) 2. Faulty appliance ( most common here is water in the base of kettle) 3. A neutral earth fault most likely caused by the screw of socket nicking the neutral cable.
Very hard to find when its an intermitting fault. Probably best to get electrician back to retest. The original test results could probably point to which circuit was close to breaking down.

Interesting stuff. Thx. It was during the day didn't have lights / check them. The way I understand it (layman here so could wrong)is the heat system is also on it's own circuit / fuse. Knocking that switch off confirms that as the system was still live.

I also have a HVAC system to which I have my suspicions about as it's blown fuses in it's plug in the past.

I'll get himself back to check.

2011

Larger loads such as instantaneous showers and heat pumps are better having dedicated RCDs. This makes it easier to fault find, has less impact if they trip as well as reducing the chances orf nuisance tripping.

Remember even when operating properly these units have a small earth leakage current.