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From what i remember, Neutral is the star point at the power source and is at earth potential at that point. Also, the Live conductor is at 240V RMS which is about 330V peak, which is why you will measure 330V across a smoothed full wave rectifier.

Then i would say that's not normal and i wouldnt accept it in my house. I would call the electrician back, and soon. Would be interested in hearing the outcome though.

Oh, another thought, is this voltage enough to get a glow from a neon screwdriver?

Dear Mr Spark, That's a nice Imprezza, however did you afford to buy that? :wink:

Hi Bell, Sorry, no i cant suggest any tests that you can do. I'm not qualified to advise you. If you had someone look at this fault already and you're not happy, call them back and get THEM to touch the "live" parts.

Now i'm wondering if these voltages are being induced by the house wiring and you have an open circuit earth somewhere??

Bell, try a different TV cos as i see it that is the only possibility of getting mains leakage into the coax.

Hi, please be aware that domestic wiring is not my field. I was just relating what i found when i fixed TVs and all that stuff, but that was 16 years ago now! Regarding the damp floor, that is only relevant if the current flows through YOU. It is not the cause of the problem, it just makes...

try a different TV as a test

Dont get me wrong, i wouldnt do this work myself. Just wanted an understanding of it so as not to get spanked when Mr Thick phones for an estimate!

i also remember that this is a real tangible voltage and you can draw a small spark if you dab the "live" part onto earth.

Adam, i remember that "earth" and "tv" never mixed! In fact TVs only had a 2 core supply cable (no earth). It may be different now that all power supplies are switch mode and not transformed, therefore fully isolated from the supply. I dont know - its not my area anymore.

Great, thanks Adam!

i fixed TVs for several years and i also noticed that in some houses you could get this voltage on the outer core of the coax. Never did get to the bottom of it BUT i had a theory that it could be mains leakage through the capacitors that connect between the TV chassis and the aerial socket. In...

Thanks! But 200 ohms between the spike and WHAT? Where do you measure this impedance? (sorry - not playing devils advocate, i really am interested!)

Yes Adam!! In my field, one MCB protects one device only. I should have said that before.

i wonder if one of the electricians could enlighten me on the principle of the grounding spike? They confuse me - surely the type of soil, clay etc and the amount and salinity of the water in the ground will determine the impedance between the spike and the true proper earth point at the power...

you're right - i don't have domestic wiring knowledge, nor do i know the building regs. I work in industrial automation - i "understand" it all but have no experience with power distribution.

The switch mode PSUs in PCs can pull a very hefty inrush current from cold and this may pop the MCB. Industrial MCBs come with 4 inrush profiles A,B, C and D, which allow it several times the rated current for a few milliseconds before tripping. A's trip sooner; D's trip later (but D's are...

I had this problem too. After many tussles with it I eventually fixed it with a new metal bath and shower screen. Oh and a new kitchen ceiling. And a couple of new floor joists. My advice - dont muck about with a leaky shower! Get rid of it.