earthing test

[simonb]

hi guys, im a bit confused(no comments), after fitting an element to zanussi double oven i started to carry out safety test, before pat test i switched on and everything running fine, i tested on megga earth resistance test(ohms) from exposed metal on cooker to socket earth nearby in kitchen (obviously not the usual test) before i did full test switched back off.

i sometimes do this to just check the presence of an earth, whats confusing is instead of usual readying of say 0.9ohms etc, i got 49v!! with a bleep from meter? at this point i did i full test of oven(every element) insulation and earth test and oven seems fine, the oven is hard wired so iv inspected and tested that too, everything looks ok, iv done every test and visual inspection i can think of but all seems ok,? anyone know why 50v may exist? i know kitchens have equip-potential zone and oven goes right back to fuse box on own circuit?

lost?

[stratfordgirl]

Re: earthing test

If there’s 50v between oven cabinet and mains socket box, then one of them is not connected to earth, plain and simple!

I found one the other day, where the oven installer had inserted the earth wire into the isolator switch terminal, but forgotten to tighten the terminal screw. The owners had wondered why they used to get shocks off the oven, but never thought to get it checked out!

[simonb]

Re: earthing test

yes of course, simples me, 😳 i would have found that out if i would have done a loop test on cooker point, in my defence the repair was at 8pm so a little tired by then, ha ha

thanks simon b

[stratfordgirl]

Re: earthing test

I know the 8pm feeling, when you’ve had a nightmare job early in the day, and every job after that seems to present another hitch.

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