mcb keeps blowing on lighting

[Wayne Hudson]

Hello sparks
I was at a Job earlier today,the customers upstairs lights would not turn on due to the 6A mcb operating so it's a short circuit so I disconnected the supply to the first light the supply disconnected from consumer unit ,then did a insulation resistance which came out clear tried the mcb without any connection it stayed on.so connected the supply at consumer unit and left the other end not connected to anything it stayed on so connected the loop out and switch live it all come back on for 2 poxy minutes then it would come back on .I had to leave disconnected and will be returning back tommorow . Any suggestions would be extremely grateful
Thanks

 

[Knobhead]

It would be interesting to know what has been fitted.

The trouble nowadays is RCBO’s being peddled as the instant cure all for all ills. A lot more effort should be made so that people understand the shortcoming of SP RCBO’s.

 

[Wayne Hudson]

It would be interesting to know what has been fitted.

The trouble nowadays is RCBO’s being peddled as the instant cure all for all ills. A lot more effort should be made so that people understand the shortcoming of SP RCBO’s.

Explain then, I fitted proteus sp rcbo 30mA, I always thought that rcbos are the best protection to have in domestic due to it being less disruptive to other circuits if a fault occured. I'm sure your gonna have a lot to say about this

 

[Bobster]

N - E faults are not cleared.

 

[SPARTYKUS]

Ive just bought a double pole RCBO. Thats the size of an MCB also.

just to have a look at it.

i suspect its like the French ones I've seen in mobile homes

 

[Geordie Spark]

Explain then, I fitted proteus sp rcbo 30mA, I always thought that rcbos are the best protection to have in domestic due to it being less disruptive to other circuits if a fault occured. I'm sure your gonna have a lot to say about this

Lose the attitude bonny lad. You're WELL out of your depth and it's showing!

 

[Wayne Hudson]

Is that a regulation in bs 7671 that sp rcbos are not recommended on a tt system if so what page number is it

 

[Wayne Hudson]

You didn't explain about the sp rcbos on a tt system

 

[urbanmonkey]

Single pole rcbo will operate in the event of an N-E fault but will not clear it, I'm sure you can how this can be a problem. Split board with 2x 30ma RCDs will cover all circuits and disconnect both L+N on the affected circuit in the event of a fault.

 

[Geordie Spark]

You didn't explain about the sp rcbos on a tt system

Sorry - I was away connecting a gas pipe to a Combi boiler.

 

[trev]

Sorry - I was bypassing my gas meter

Fixed that Fatha

 

[Knobhead]

Explain then, I fitted proteus sp rcbo 30mA, I always thought that rcbos are the best protection to have in domestic due to it being less disruptive to other circuits if a fault occured. I'm sure your gonna have a lot to say about this

Your thoughts were wrong.

 

[Guest77]

Lose the attitude bonny lad. You're WELL out of your depth and it's showing!

Yes another losing case on here, it may last another 2-3 pages before he gets the message he is wrong, another know all.

 

[Geordie Spark]

Fixed that Fatha

That was last week Son and the gadgee came knocking at the door to read it but I wasn't in!

 

[Geordie Spark]

Yes another losing case on here, it may last another 2-3 pages before he gets the message he is wrong, another know all.

Being "wrong" is one thing but the attitude is something else.

I can see him getting a long way in his career if he keeps that up .. NOT!!

 

[tidyboiler]

That was last week Son and the gadgee came knocking at the door to read it but I wasn't in!

Oh didn't I tell you? I let a nice little man in with Jack boots and a swastika on his back........ he asked if I could show him the meters, but I wasn't sure what he meant, so I just showed him those things which whizz round, and have "GAS" and "ELECTRICITY" on them. He thinks you may need new ones as they are going backwards and he will try and catch you next time. :dita: