RCD Tripping

[seajayess]

Ok not been on for a while kept saying password was wrong, so here you go help me out with this.

2 c/u, each has its own RCD 30 mA, connected to one supply at the origin system is TT. Today on several occaisions the RCD's have tripped and some times both together at the same time. The system is not new and no work has been carried out on the premesis it has just started to happen. There has been work carried out within two poles of the premises and there is some workshops on the same overhead cables.

So today went, did a quick test on the boards L/E N/E both results were above 5 M ohms, also tested between the two boards N/N >500 M ohms. All this has started to happen over the last three weeks , last week went, sugested they get DNO out to check overheads into property. which they did said all is OK (although spoke to somebody in one workshop and he said they didn't do a lot DNO that is). All last week no tripping today at 8.30 it started went on throughout the day, doesnt seem to trip at night. I think its not getting a clean supply into property causing RCD's to trip.

Oh and its good to able to log on again

 

[batty]

Welcome back Seajayess not sure whats causing the problem but as you know intermittant tripping is the worst to find. Have you tried putting a large load on and see what happens to voltage may help to see if there is a problem with incoming supply.

 

[steptoe]

what is your Ra?

is it possible your pulling a fault in through your main bonds/rod?

what type of RCDs are fitted? do they have an earth reference point on them?

 

[seajayess]

Thanks for the replies, went back yesterday and they were still tripping the RCD's during the day. Found out that UK power are replacing the transformer for a larger one, and when we spoke to them they said that the house is on the end of the supply and the present transformer is no longer gig enough for the demand.

So we have to wait till they change the transformer and see if the fault dissapears

Thanks CJS

 

[batty]

Thanks for update hopefully that may sort it.

 

[Doc Hudson]

Do please keep us informed and welcome back.

Doc H.