Club 80-90 Forums

The only thing on and off between 23hours and 11am is the water heater.

John.(g.h.o.s.t) Us mods don't have access to the swear filter.Admin only.

The RCB wouldn't latch this am (with the mains off) ( it tripped earlier on) so I replaced it ,ok so far!
Another question;what appliances shouldn't be Megger tested?
Ta.

Depends on how you define a Megga tester. Most modern "safety testers" are referred to as "PAT" testers and have built in pre-programmed settings that you choose based on what you are testing. This can be like:-

A 2 wire device (no "earth" = double insulated) with no delicate parts inside, such as a table lamp or simple hair-dryer
or
A 2 wire device (no "earth" = double insulated) with delicate parts inside, such as a modern Hi-Fi or a "smart" hair-dryer etc
or
A 3 wire device (earthed) with no delicate parts inside, such as a simple tumble dryer (mechanical timer) or a simple electric drill (no speed control) etc
or
A 3 wire device (earthed) with delicate parts inside, such as a "fancy" tumble dryer (electronic timer) or a "fancy" electric drill (with speed control) etc

So it gets complicated what with so many seemingly simple devices having delicate electronic circuits inside, as per the examples above of a hair dryer, which these days might have fancy electronic temperature control circuits inside, same with drills and tumble dryers etc etc etc.

Part of some tests include sending a high voltage around the device to test "insulation breakdown" but if the device has any "electronics" inside, this will damage it. Personally I would avoid high voltage tests, you never know whether the thing you are testing might have some sort of electronic circuit, even if it's just a simple component (like a Varistor) to prevent it radiating interference. I reckon modern PAT testers have different methods of doing those tests, though as I say, it was a good few years ago since I last used one (and went on the course).

Ghost ,thanks for a very full reply! The last thing I Megger tested was in the mid 70ties!
I've had a look at the RCB,the contact I've looked at is very burnt n blackened and a small Spring had come loose!
We will see if the new RCB trips over the next week or so!

The new RCB tripped around 17.00!! Not much on at that time just fridges n lights,back to the drawing board!!well test gear.

Update..the RCB tripped and couldn't be reset! I checked the water boiler with test meter 7.5k ohms live to earth,later 12meg ohms..checked with a Megger..dead short!!
Today new boiler fitted.
Just waiting for one of the cats to pi$$ on a main socket !!