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Hi, I know it's best practice to run an immersion on a dedicated circuit but am I OK with the following

A new heat pump is being fitted and it has a wiring centre in the airing cupboard next to the cylinder, the wiring centre requires a 3A switched spur to power the circuit board a diverter valve and a small contactor for the immersion heater, there is a comms cable from the outside heat pump that tells the wiring centre to control the diverter valve (heating or hot water)and once a week turns on the immersion heater contactor to disinfect the cylinder "legionella cycle"

My question is can I use the immersion heater supply cable to power both with a 20A DP switch for the immersion and 13A switched spur (3A fuse fitted) for the wiring centre or do I need to run a new supply or spur of a local ring for the switched spur

Thanks in advance
 
My question is can I use the immersion heater supply cable to power both with a 20A DP switch for the immersion and 13A switched spur (3A fuse fitted) for the wiring centre or do I need to run a new supply or spur of a local ring for the switched spur
Loading on that lot.
 
You’ve not got an “immersion heater supply cable”

You’ve got a radial circuit.

What you put on the end of it is up to you…. As long as the circuit is suitable for the load.
(OCPD, cable size, installation method)
 
If it’s not possible to supply elsewhere then connect to the IH circuit, keep him happy label it… after all its a radial circuit dedicated for both now
 

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