View Single Post
  #3   Report Post  
Posted to uk.d-i-y
Graham.[_2_] Graham.[_2_] is offline
external usenet poster
 
Posts: 1,036
Default MCB tripping - why?



"John Rumm" wrote in message o.uk...
nafuk wrote:
Hi, the MCB on my split circuit consumer unit is tripping
sporadically, sometimes when nothing is connected to the downstairs
socket circuit. The MCB protects the RCD protected circuits (upstairs
and downstairs sockets, cooker, hot tank, kitchen sockets). The hot
tank and cooker circuits are turned off at the rcd and are not
connected used/connected yet.The light (non-RCD'd) circuits stay on
when the RCD trips.

Please can someone tell me what causes an MCB to trip, other than
overcurrent, and not trip an RCD, and hopefully some possible things
to check in order to locate the fault.

This 'may be' heating associated but does happen when the heating is
off and the boiler is off i.e. could it be associated with hot pipes
near a cable?


I am guessing that you have transposed the terms RCD and MCB here, and what you actually have is a nuisance RCD trip. You will
need to be methodical to track down the cause of this. Some advice is given in the nuisance trip section of this article:

http://wiki.diyfaq.org.uk/index.php?title=RCD


--
Cheers,

John.


I am confused by his post too. If the individual circuits are protected by
RCBOs rather than RCDs it begins to make more sense

--
Graham.

%Profound_observation%