Scenario

[m4tty]

Hi,

Scenario:

You go to a customers house and theres one rcd covering the whole board and it has tripped and wont reset.

Do you turn the mcb's off and see if the rcd resets? then turn each mcb back on one at a time and wait till it trips, then investigate further on the mcb which is causing the tripping..... right?

Thanks

 

[SPECIAL LOCATION]

Thats what I would do.

Don't forget a N-E short somewhere would be detected by the RCD when any one of the circuits are energised.

so more than one MCB could "appear" to trip the RCD!

 

[ianmacd]

Also could be a cumalitive issue. Try switching only one on at a time.

 

[Andy™]

turn all off, and back on one at a time. once found, try again from other side - it may be an N-E on another circuit, but wont be apparant until there is a load from another circuit. failing that, megger. but dont forget to isolate the neutrals

 

[paul b b]

i have had a call from someone, every time the electric triped off it took out the rcd, could only be reset when all mcbs were off. went round to do another job but she did not want to pay for me to invesagate, but sounds like a N-E fault somewhere then

 

[batty]

i have had a call from someone, every time the electric triped off it took out the rcd, could only be reset when all mcbs were off. went round to do another job but she did not want to pay for me to invesagate, but sounds like a N-E fault somewhere then

Old Rcd's can do that had one exactly the same, changed for modern consumer unit although was done to 16th edition ie 100mA TD Rcd main switch with sockets on 30mA trip has not been problem since.

 

[steptoe]

Old Rcd's can do that had one exactly the same, changed for modern consumer unit although was done to 16th edition ie 100mA TD Rcd main switch with sockets on 30mA trip has not been problem since.

so 15th is modern then.?

thats a typical 15th TT

 

[batty]

so 15th is modern then.?thats a typical 15th TT

Thought that was 16th well it was when I went to college.

 

[Andy™]

Thought that was 16th well it was when I went to college.

typical 16th too. common until 17th