Sparks wrote:

a RCD in many cases. What sort of earthing do you have?


TN-S


What you need to do is leave the live connected to the live, neutral to
the neutral, and then disconnect the earth. Now connect one test lead to
the earth connector on the appliance, and the other one to the earth wire
you just disconnected.


That will trip the RCD, as the leakage is a lot more then 30mA

In which case can you move the supply to the non RCD side of the CU and
repeat the test?

As this method trips the RCD, I connected the probe the the Nuteral, as it
is at the same potential as earth

Your Neutral is very unlikely to be the *same* potential as earth -
close certainly, but given they are both going to be low impedance paths
there is a good chance a substantial current will be able to flow
between them if connected.

If it is faulty, then passing 2.9A to earth would be a rather odd fault. I
expect you are simply measuring a large current flow between N and E


Well, sort of - the disconnected earth of the hob and the N of the supply.

So that measurement is taken with the hob effectively not earthed at all
(i.e. the earth wire from the supply cable was not connected to anything)?

If you diconnect the hob and measure the resistance between L & E and E
& N and L & N (with all the switches/controls on the hob turned off),
what readings do you get?


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/