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Immersion Heater Wiring.

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A customer has an economy 7 immersion heater to heat water in a copper cylinder. That is all she has to heat the water, one element.

She needs a boost function. Easy I thought. Just install a boost timer control.

But the existing immersion heater is supplied from a non R.C.D. protected off peak board. The booster switch will need to be fed from a 24 hour on peak board. All the on peak boards are R.C.D. protected via one R.C.D.

 

So, what is the easiest way to switch from off peak to on peak boost whilst not getting the neutrals interconnected, and with an automatic default back to off peak after the boost period?

 

I was thinking about a double pole changeover contactor. Is there another way?

 

Z.

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    The copper cylinder is very distant from the consumer unit and only has an off peak supply cable.

    The French approach would be to have a single power cable plus a “pilot” wire to signal when off-peak was available. Is it an E7 kind of tariff where the ‘peak’ supply is charged at off-peak rates during the night? If so that might simplify things - connect the immersion to the peak supply (no DP C/O switching required then) and use a signal from the off-peak supply to switch it on a night - possibly using one of those wireless units to get the signal from the off-peak board to the airing cupboard without needing an extra cable.

       - Andy.

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  • 0

    The copper cylinder is very distant from the consumer unit and only has an off peak supply cable.

    The French approach would be to have a single power cable plus a “pilot” wire to signal when off-peak was available. Is it an E7 kind of tariff where the ‘peak’ supply is charged at off-peak rates during the night? If so that might simplify things - connect the immersion to the peak supply (no DP C/O switching required then) and use a signal from the off-peak supply to switch it on a night - possibly using one of those wireless units to get the signal from the off-peak board to the airing cupboard without needing an extra cable.

       - Andy.

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