disconnected an immersion heater timer from a FCU when connecting the earth back into immersion heater terminals got a small spark . disconnected and tested earth from FCU to pipes and have 70v ! The supply is a PME any ideas before I start opening up circuits and testing ?
70v between earth and water pipes !
- Thread starter mik73
- Start date
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Also use a test lamp between earth in FCU and the tank with the meter connected.
If the voltage reduces to near zero ( less than 1 volt ) then the 70volts is stray capacitively induced and indicates there is likely to be a missing bond to water pipes or a break in the earth between FCU and the CU.
The test lamp is a 230 volt filament bulb in a holder with leads.
If the voltage reduces to near zero ( less than 1 volt ) then the 70volts is stray capacitively induced and indicates there is likely to be a missing bond to water pipes or a break in the earth between FCU and the CU.
The test lamp is a 230 volt filament bulb in a holder with leads.
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Two options. Your bonding is no good or part of the water pipe is in plastic. What ever the reason, I would install supplementary bonding as well and start chasing the fault. 70 volt on a water pipe is definitely a no no.
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