Hi Grizzly, AMP and Richard
An intresting Issue
although I don't know as I'd be particularly comfortable with taking the appliance apart
I would hardly call this taking an appliance apart; it was no different really to removing / replacing a 13amp plug having all the same characteristics, live, neutral, earth, and a cable securing strap. (well that was the one that I came across)
The reason for me to remove the plug was for 2 reasons, I used both a Megger PAT4 and Megger PAT 420, If I perform an extension cable test for this asset, the PAT first looks for polarity, but because the PRCD is not energised (open circuit) then it will not perform any further test because it is unable to astatine this first initial test being a polarity test.
Secondly if I perform a Class 1 Test again the PAT registers an open circuit and again aborts the test thinking that it’s a fail, because of the open circuit.
So the only way I believe around this was to remove the PRCD from the extension lead replace it with a 13amp plug or adapter as mention in my last reply, perform an extension lead test, replace the PRCD and then perform a Full RCD test, therefore both items have been tested, using the reattached extension cable within the test sequence.
I have read in the last C of P 3rd Edition and i am sure its in the new version (I do have a copy) a few years ago about supplementing a IR test in-lue for a leakage tests which was an option for assets that were IR vulnerable such as IT equipment. With many new PAT's on the market today having the ability to drop down to 250v for IR testing, giving us avenues and options to test appliances.
City and Guilds 2377 Qualified PAT Testing Engineer
Always looking for new customers based in Cornwall
All in accordance with The IEE CofP www.handselectrical.co.uk