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I was being flippant about measuring (R1 + R2) twice - as you'd already acknowledged, making and re-making connections is prone to introducing faults. I was suggesting that, in the majority of installs, you can actually carry out (R1 + R2) testing without disconnecting anything. I don't agree...

So, did you tick it?

:D Unless you have an ancient tester, which generates a very high test current, that doesn't really hold true anyway - that's a hark back to the days of the Clare Tester, which used to reveal defective joints in conduit/trunking. (But why not just do (R1 + R2) again... the proper way, without...

Out in the real world, Special Locations? That's where I live. Real installations, andyc? All the time, day in, day out. Establishing a value for Zs? You always have both options (calculation or measurement) for a new installation, so why take the one most likely to breach Regulation 14 of...

The answer is pretty much what Apache said. But this kind of ignorant marketing does nothing to help clarify the situation and furthermore, the centres that peddle such incorrect information may not be the most reliable sources of knowledge. When did you last hear of a Part N course for...

No, no, no, no, noooooooooooo!!!!!! NEVER do this. Never. I am shocked and dismayed that three of you think this is acceptable practice. If you can't measure Zs directly (and why would you want to on a new installation?) then calculate in accordance with Appendix 14.

Dude, you're getting well confused. RCDs may be used to assist disconnection for earth faults where disconnection times cannot be met by overcurrent devices. As minimum earth fault currents will be of the order of 1A+ a 100 or 300mA RCD will do this job perfectly well. But, RCDs of 30mA or...

As usual, everybody goes off on one without understanding how this all works. Part P is a very simple and unchallengeable legal requirement (and I quote)... "Reasonable provision shall be made in the design and installation of electrical installations in order to protect persons operating...

Only because that's what the regs say about manufacturers' instructions.