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    100V across immersion - no hot water

    Immersion cable connects to an isolating switch in the airing cupboard, the feed for this is chased down a wall to 'somewhere'. I turn the switch off (open) and measure 100V across the L & N, at the same time I measure 230V between L and E and 150 between N & E. My thoughts, if this...
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    100V across immersion - no hot water

    Ricicle, I'm sure I must be being thick but my post described two points, the first that the isolation switch is open and therefore there is zero volt drop across the heater and second that, with this switch open (no load) I measure 150V between N and E. Because you say that N should be the same...
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    100V across immersion - no hot water

    Not an electrician myself but I think its the current that blows the fuse not the voltage, hence why when we connect live to neutral in a kettle 9or in my case an immersion) the fuse doesn't bow as the 'coil' has a high enough resistance to lower the current. However, sparks comments about...
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    100V across immersion - no hot water

    Thanks Spark123...what you say makes sense....I guess I need to chase the cable! Was thinking to switch ease RCD at the consumer unit to find which feed it comes from and see if there are any joint boxes. The consumer unit is in the garage and I know there are a few JB's on the roof of the...
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    100V across immersion - no hot water

    Seem to have developed a problem that I am only measuring 100V L to N across pair at switch to thermostat/heater element. I measure 230V L to E but also 150V N to E. All measurements with switch open (no supply to heater). Do these measurements indicate an earth fault between N/E. I am not...
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