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[quote name='Andy

Is it a final circuit, yes Are the conductors connected to a single point and form a ring,? if yes Its a ring.

I can see your predicament, though would you not be better using isolation?

Which conductors do you place your leads on to conduct the test?

Are you saying the installations comes under Group 2 Medical Location? If so are you departing from BS7671 and suggesting your system as an alternative?

Double ground loop

Have you tried strapping the RCD?, i have no issues with my Megger.

Which Reg are you referring to Paul, how are you carrying out the test?

It must be the way you test them Dave.

That unfortunately is the case, all these boys paying scam schemes, as long as you do the job correct and you don't use a logo, its difficult to get prosecuted.

How you testing them Paul?

I see no reason for the upstream device to trip, either on the test button or when testing with a meter.

There's a very good reason too! Its all propaganda, they want you to feel big brother is watching you and that the cowboys are being caught. The problem is the cowboys cost to much time and money to catch, so they go for the registered ones, they know who and where they are, and working. The...

Why would you need to bypass anything?

Quite right, id like to think most electricians no how to test for polarity, testing wont come much easier

Comments, a little less ramble lol :)

Just join L -N then L-E then N-E, go around each socket, this will confirm polarity

The same way you carry it out on a Ring

Well additional protection is required for socket outlets, so where socket outlets are being installed, then RCD protection will be required.

Why would you want to install two RCDs which are the same in series?