MCB tripping

[fuse]

Hi chaps not been here for a while,
The last 3 nights the 32a mcb for the downstairs ring has triped but has been fine during the day with everything on ie. dryer, washer, dishwasher, fridge etc.
I just got up for the obvious, and its triped again (3 am) I changed the mcb this mornng and meggered he circuit and it was over 19.99 Mohm. It has got me stumped! Any idea's
Cheers

 

[HandySparks]

Freezer auto-defrost?? Some sort of water heater on a timer? Do you have an outside PIR light hung off the ring?

 

[Top Cat]

Freezer auto-defrost?? Some sort of water heater on a timer? Do you have an outside PIR light hung off the ring?

Good advice!

 

[Spazz]

Unplug everything overnight (except the fridge and freezer) then try that. Turn off anything that is connected to the downstairs ring - for example boiler, etc - you can always plug them back in in the morning.

If that trips then its one of the things plugged in.
Do a PAT test on the fridge and Freezer checking for earth leakage.

Out of interest have you got an RCD installed on that circuit - if not you may have an earth leakage problem.


Just to let you know you have something creating a low resistance between the line and neural (i you got an RCD)/or earth (if no RCD)
Your getting something with a resistance lower than 14ohms.

You can always plug the fridge and freezer into an extension lead running from the upstairs ring (if on a different circuit)

Good Luck