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I'm reasonably competent in most aspects of DIY, but have an electrical problem which has me a little confused and prompted me to register rather than lurk in the background, hopefully you can help.
I have a Philips solid ring hob, I noticed on Saturday a slight tingle when I touched the handle of a metal pan.
The hob is wired onto a separate circuit which only feeds the oven and hob, so can be easily isolated using the wall switch which only feeds the hob. I grabbed my multimeter and measured for AC between the metal plate of the hob and earth on an adjacent socket. Results as follows:
Wall Switch off - Less than 1 volt
Wall Switch on - around 18 volts
Wall Switch on , any hotplate on - around 80 volts
Clearly not good.
I disconnected the hob and identified / suspected that a couple of the plates had become porous as a continuity test showed they had around 3 k ohm resistence between the supply feeds and earth. Others plates had zero continuity (or at least 20 M ohm as that's the max on my meter)
My original plan was to buy replacement plates and reinstall, but as luck would have it I managed to pick up another identical hob (removed only due to kitchen upgrade) to use as a source for spares / replacement unit.
I therefore checked this replacement hob out electrically and made sure all plates had zero continuty to earth and there was no continuity between L / E, L / N, N / E on the hob with switches in the off position before reinstalling. Each of the switches was also checked to confirm that the resistance varied correctly according to the switch position.
I then reinstalled the hob and carried out the same tests
Wall Switch off - Less than 1 volt
Wall Switch on - around 18 volts
Wall Switch on , any hotplate on - around 45 volts
I am now wondering if there is some earthing problem on the supply to the hob as two separate appliances are showing the same problem.
I would be grateful for any further thoughts or advice on the likely cause of the problem or my fault diagnosis approach.
I don't want to decide to buy a new hob if there is a problem on the supply side and I don't have access to an IR tester to disgnose myself
I have a Philips solid ring hob, I noticed on Saturday a slight tingle when I touched the handle of a metal pan.
The hob is wired onto a separate circuit which only feeds the oven and hob, so can be easily isolated using the wall switch which only feeds the hob. I grabbed my multimeter and measured for AC between the metal plate of the hob and earth on an adjacent socket. Results as follows:
Wall Switch off - Less than 1 volt
Wall Switch on - around 18 volts
Wall Switch on , any hotplate on - around 80 volts
Clearly not good.
I disconnected the hob and identified / suspected that a couple of the plates had become porous as a continuity test showed they had around 3 k ohm resistence between the supply feeds and earth. Others plates had zero continuity (or at least 20 M ohm as that's the max on my meter)
My original plan was to buy replacement plates and reinstall, but as luck would have it I managed to pick up another identical hob (removed only due to kitchen upgrade) to use as a source for spares / replacement unit.
I therefore checked this replacement hob out electrically and made sure all plates had zero continuty to earth and there was no continuity between L / E, L / N, N / E on the hob with switches in the off position before reinstalling. Each of the switches was also checked to confirm that the resistance varied correctly according to the switch position.
I then reinstalled the hob and carried out the same tests
Wall Switch off - Less than 1 volt
Wall Switch on - around 18 volts
Wall Switch on , any hotplate on - around 45 volts
I am now wondering if there is some earthing problem on the supply to the hob as two separate appliances are showing the same problem.
I would be grateful for any further thoughts or advice on the likely cause of the problem or my fault diagnosis approach.
I don't want to decide to buy a new hob if there is a problem on the supply side and I don't have access to an IR tester to disgnose myself