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Thanks guys. Another minor question as to why the relays had been originally fitted - presumably the old controller (and new one hopefully) can handle the current (what wattage would a pump normally be?) - so is it the actual switching of the pumps that causes the potential problem?

Brown, Blue, 2 x Black, Earth (yellow/green) - it's the flex type stuff (multi-strand) - £1.88 per metre from B&Q - a bit expensive but I thought it would make for a tidier easier job.

I've bought 20 m of 1mm 5 core so that I only have to use one run - do you you think that's OK?

Hi, Our current electromechanical controller - a Horstmann Diamond - has just failed. So I have bought a new Drayton Tempus 7 electronic programmer. However, when trying to work out how to install it I noted that the mains supply seems to be fed through the controller to two relays, one for...