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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> Hot tub wiring 32amp https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1405071126 Message started by Plocke on Jul 11^th, 2014, 10:32am

Title: Hot tub wiring 32amp
Post by Plocke on Jul 11^th, 2014, 10:32am

Hi I need a hot tub wiring with a 45-50m run from rcd to rotary isolator switch. Can someone just confirm that 6mm swa 3 core armoured cable is ok and that it can be cleated all around fence to get it to hot tub also anyone know a rough price to just connect to rcd box and rotary isolator switch for me as plan on buying and running cable myself to cut costs many thanks

Title: Re: Hot tub wiring 32amp
Post by Lectrician on Jul 11^th, 2014, 4:30pm

6mm² is OK (just) at 50m, using a 5% volt drop.

Interestingly, if you went to the 16th edition of the regs (the last one just gone), you had a 4% max volt drop, and this would of meant upping the cable to 10mm² for 50m.

You can drop a maximum of 3% for lighting and 5% for everything else. IF you have no lighting on that cable run (I don't see underwater lighting as counting), then 5% is the max.

You could only run around 30m at 32amp with a 3% volt drop.

Prices vary across the country. You would need to allow approx £250-£300 including materials I guess.

Your electrician will likely want to be upgrading your main protective bonding too if this is not up to the required size.