Rcd keeps tripping in mainboard

[J25GTi]

Yes mate. Just a little hung over today lol.

Good advice right there. Me been a bit slow due to illness there.

haha your advise is good too! you also a sparky?

 

[williamocarroll1982]

If its taking a while to trip out then its most likely a faulty fridge/freezer as they only kick in when the temp inside goes up. If you can plug out the fridge and freezer and plug the in somewhere else in the house totally using an extension lead and it still trips then you no its the appliance and not the wiring, if it doesn't trip out when its plugged in somewhere else then its a wiring problem

 

[scot-ish]

i would guess that the compressor on the fridge si fucked. but fridges now are designed so you cant open them up and test components.

 

[J25GTi]

i would guess that the compressor on the fridge si fucked. but fridges now are designed so you cant open them up and test components.

Rcd only trips in the event of an earth fault, if the compressor in the fridge is u/s then it usually would pull out the mcb first.
Obviously depending on what way it fails.

 

[J25GTi]

Any update?

 

[lingl9z]

Cheers for the help guys, seem's to have sorted it's self out for now, not entirely sure why it's suddenly working again but will hold out and post again if it dies again, something must not be right!

 

[J25GTi]

Might just be damp etc! Pm me if it does as I'm not always on

Cheers for the help guys, seem's to have sorted it's self out for now, not entirely sure why it's suddenly working again but will hold out and post again if it dies again, something must not be right!

 

[lingl9z]

Might just be damp etc! Pm me if it does as I'm not always on

Thanks buddy will do!

 

[Wuldo]

the rcd will trip in the event of a short circuit preventing you front frying yourself basically
resulting in a VERY bad hairstyle and possibly some injury lol
or maybe a fuse fecked somewhere

 

[J25GTi]

And what is the technical term for a short circuit? An earth fault

A fuse might take out an mcb(I say might as it all depends if you have the correct settings etc. In theory this should never happen), as that is OVERload protection. An rcd does not protect against an overload situation. Only a earth fault (live to earth + neutral to earth)

So any equipment with high leakage currents, computers etc can take out rcds without there been any sort of "fault" to speak of.

But mainly it will be a short circuit (melted insulation, damaged equipment etc)

the rcd will trip in the event of a short circuit preventing you front frying yourself basically

resulting in a VERY bad hairstyle and possibly some injury lol

or maybe a fuse fecked somewhere

 

[williamocarroll1982]

And what is the technical term for a short circuit? An earth fault

Not necessarily because although an earth fault may be a short circuit, not all short circuits are earth faults. A short circuit between live and neutral isn't an earth fault

 

[lewism1]

might b damp to do with the weather not really sure bud

 

[danb87]

had a similar problem on a house i was working at, there was an earthing problem, an it kept trippin the rcd. they had too remove 40 of them little lights you have it kitchens etc, an then it turned out it was the main plug in kitchen room lol

 

[williamocarroll1982]

had a similar problem on a house i was working at, there was an earthing problem, an it kept trippin the rcd. they had too remove 40 of them little lights you have it kitchens etc, an then it turned out it was the main plug in kitchen room lol

Why in the name of God would they think it was a problem with the lights . Lights aren't put on the RCD protected Neutral circuit at all

 

[danb87]

Why in the name of God would they think it was a problem with the lights . Lights aren't put on the RCD protected Neutral circuit at all

no idea mate, i was finishin of some grouting on the job. an the sparky come in an was like why the fuck, as he was only testin them for certificate. some one else fitted. an he seemed too think it was one of the lights. turned out it was a plug socket tho.

 

[J25GTi]

It monitors earth faults. What does neutral connect to?

And what is the technical term for a short circuit? An earth fault

Not necessarily because although an earth fault may be a short circuit, not all short circuits are earth faults. A short circuit between live and neutral isn't an earth fault

 

[toyobaz]

Why in the name of God would they think it was a problem with the lights . Lights aren't put on the RCD protected Neutral circuit at all

why would lights not be on an rcd ?
latest regs require all circuits within a bathroom and buried cables to be on an rcd !

 

[J25GTi]

Unless protected by a mechanical containment system, or on individual rcbos. Which is the way I would go as then you don't take out the whole board when a lamp blows.

And aalso doesn't apply to fire alarms, or safety ccts, gas valves, etc...

Why in the name of God would they think it was a problem with the lights . Lights aren't put on the RCD protected Neutral circuit at all

why would lights not be on an rcd ?
latest regs require all circuits within a bathroom and buried cables to be on an rcd !

 

[toyobaz]

but a neutral only connects to earth before the consumer side, and before any rcd device

you can have a short circuit in an earth free enviroment, take car electrics !

 

[J25GTi]

Yes you can... But that's not what we are talking about.

Have you ever seen the earth fault path?

Live to neutral fault, travels down the cable. All the way back to the sub station, then back up the earth cable and causes the rcd to trip...

The neutral cable in an rcd (its been a while since I did wee rcds I think this is right) is to monitor the voltage difference between a 0 potential between neutral and cpc. Then when it detects a fault down to earth (line - n, n - cpc, cpc - line etc) it will pick up the difference between the N and cpc.

If I remember correctly, its been 5 years since I did anything with an rcd lol...