No need to remove the fuse if you've opened the double pole switch.
I have now noticed that you tried P&CH first.
Indeed, not to mention the fact that we've been told that the N-E resistance is only 0.7Ω. One would hope that no voltage meter would have an input resistance lower than that (or, indeed, even remotely as low as that - the currents through the meter would be ridiculous, and frightening!)!UMM ... If the voltage between earth and neutral disappears with a low resistance meter than you have a problem because that would mean at least one of your neutral or earth is not properly connected.Would probably disappear with a low resistance meter.Earth and neutral= 17V
its an electrical question no gas seals were broken nor was the seal to the combustion door broken. Not illegalI have now noticed that you tried P&CH first.
Did he get told that he wasn't allowed to do it?
Sorry I don't understand could you say that in layman termsIndeed, not to mention the fact that we've been told that the N-E resistance is only 0.7Ω. One would hope that no voltage meter would have an input resistance lower than that (or, indeed, even remotely as low as that - the currents through the meter would be ridiculous, and frightening!)!UMM ... If the voltage between earth and neutral disappears with a low resistance meter than you have a problem because that would mean at least one of your neutral or earth is not properly connected.Would probably disappear with a low resistance meter.Earth and neutral= 17V
Kind Regards, John
In layman's terms ... I think EFLI's comment was probably incorrect, so you're probably best advised to ignore it (unless/until he clarifies).Sorry I don't understand could you say that in layman terms
No, does it matter? Often they do.Did he get told that he wasn't allowed to do it?
How can it be, if there really is only 0.7Ω between the points being measured between? Your 'LoZ (3k) setting' meter would reduce the resistance between those points from 0.7Ω to about 0.6998Ω - do you really think that would make a difference? The phenomenon you're talking about is only seen when there is a very high impedance between the measurement points (usually with 'floating' conductors), in which case a LoZ meter will dramatically reduce that impedance, and thereby make the 'spurious' voltage reading go away.Is that not what is frequently referred to as 'ghost voltage' because of the high impedance ( >5MΩ ) of 'normal' DMMs which disappears when using an analogue meter or DMM with LoZ ( 3kΩ ) setting?
Probably in terms of some sort of error! If there really were 17V between the two (N & E) conductors (as measured, say, with a high impedance meter), and there really was only 0.7Ω between those conductors, then about 24A would be flowing (presumably permanently) through the N-E connection (wherever it was)! I assume that either the resistance measurement or the voltage measurement must be wrong - they simply aren't sensibly compatible.If not, bearing in mind the 0.7Ω between N&E, how is it explained?
Perhaps - as I said, 'some sort of error'. However, if the N-E resistance really were 0.7Ω, even 1.7V would imply a (presumably constantly) 2.4A flowing through the N-E connection, which seems not only very unlikely but also very wrong!Perhaps it was only 1.7V.
Maybe - I think I'd be more inclined to suspect the way in which the measurement were undertaken, or the way the meter was read. It may even have been 17 mV - credible, and just about low enough to not trip an RCD!Ok. My mistake - other than it may not be there with a more accurate meter.
To expand a little, in case anyone’s interested ....The phenomenon you're talking about is only seen when there is a very high impedance between the measurement points (usually with 'floating' conductors), in which case a LoZ meter will dramatically reduce that impedance, and thereby make the 'spurious' voltage reading go away.
Where did you discover the need to complete these four tests?Theses test that I'm performing are standard tests that have to be preformed on a gas boiler before you service that boiler. The four tests to be completed are earth continuity, short circuit, resistance to earth and polarity. Three tests are done with the boiler isolated and obviously polarity is a live test. Theses tests are testing the boilers internal components and wiring looms within the boiler itself and not the source. Tests are being completed with a auto range multimeter.
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