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Discuss 1.25 flex of a 13 amp fused spur feeding a 3KW immersion heater in the UK Electrical Forum area at ElectriciansForums.net
Firstly I'd say you shouldn't be using a 13a FCU as it's right on the limit with a 3kW Immersion heater - much better is a good quality 20 amp DP switch and it should be fed via a dedicated 2.5mm circuit from a 16a MCB or RCBO. As for the flex, 1.5mm minimum.
1.25mm is on the limit for 13A anyway, more so in a hot area so I would also go 1.5mm
Agree with the FCU, not needed for a dedicated circuit anyway, and an indication it might be off a RFC which is not good practice.
Agree with the FCU, not needed for a dedicated circuit anyway, and an indication it might be off a RFC which is not good practice.
1.25 is a fairly non standard size imo which is usually found on extension leads and 4 way plug adaptors etc
1.5 should be used for fixed hook ups like immersions and storage heaters imo
1.5 should be used for fixed hook ups like immersions and storage heaters imo
If it's on a 16A circuit, then the fuse in the FCU is not required, so the FCU should be replaced by a 20A DP switch. A 13A fuse will run hot feeding a 3kW immersion heater, and the plastic of the FCU will be damaged over time.
![[ElectriciansForums.net] 1.25 flex of a 13 amp fused spur feeding a 3KW immersion heater](https://electricians.s3.eu-west-1.amazonaws.com/data/attachments/63/63314-b4fe199b0216b2804a6a02ae7ad06a49.jpg)
You were at 25 characters at the “e” of “regulation”So is this an occasion where regulation 433.3.1 comes into play? I will make this 25 characters long to comply with these rules. Just about 25
25 words would be longer.
I’m not sure what this limit achieves…. Apart from stopping someone spamming threads with one letter posts just to be annoying.
Reply to 1.25 flex of a 13 amp fused spur feeding a 3KW immersion heater in the UK Electrical Forum area at ElectriciansForums.net
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