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0.5 ohms

I measured continuity between the pipe going into the shower and the earth of the supply cable coming out if the wall (removed from the shower terminal to make sure there was no connection internally). I got a beep and measured 0.7 ohms. Does this mean the earth is a good reference?

With the switch on, I get 2-3ohms between the live terminals, and no continuity between the neutrals. With the switch off, there is no continuity anywhere. I don't have any continuity between any other terminals.

I have only ever worked on wiring with the fuse from the consumer unit in my pocket before. The "bang" was not a planned part of the testing procedure, I can assure you. And I am sure none of the people jumping on this thread have ever had a multimeter probe slip. If you read further up, you...

Thank you for your concern, but I have seen "professional" sparkies do a funny little dance while working on lights at work.

With all wires in, I get 0V on the neutral on the supply side, and 150V on the neutral on the load side. I disconnected the load side, just to make sure that the wires are on the right sides. I have 0V on the live that was on the supply side, but the neon doesn't come on when I turn on the...

I just did an RCD test - I was sure I was touching just the earth when I got a massive spark and bang. The earth is very close to the live supply terminal, and I must have been too close to that with the probe. I will have another look tomorrow when I have calmed down... Unless I need to...

That was quick! Everything looks fine in the switch. I can't smell any burnt out smell in there. Do you mean visible burning, or could the burnout be in the run of cable between the switch and the shower?

I'll start from the beginning. I got in the shower a week ago, and the water came on, but did not get hot. I noticed that the neon in the isolator came on, but when I turned on the shower, it went out. After opening up the shower, I found water coming out of the heater element can, so decided...