Immersion heater. Dedicated circuit?

[Phoenix]

The only issue that I have with immersion from lightly loaded ring (providing its middle-ish on ring), is the 13A fuse spur, many makes seem poorly made and drawing 13A continuiusly leads to failure of fuse carrier. This also applies to when someone puts in dedicated immersion circuit and fits 13A fuse spur on end instead of 20A DP switch (why?).

Seen many panel and downflow heaters cause fuse in spur to become hot from poor contact, damaging the plastic of the fuse carrier, leading to the front of it comming away when you try and pull fuse leaving live fuse still in place!

 

[batty]

A decent make accessory should not have this problem i use Contactum and have not seen this happen on ones i've installed.

 

[Phoenix]

Think it was the own brand of one of the wholesalers (though will not say which one) last time I saw it!

 

[batty]

As said a decent make should be able to carry 12.5 amps all day although not a good idea to have them on a plug top i find. I do agree though you should be able to have them on a 20 amp switch though and probably better design.

 

[Technician]

On first inspection, if you look at table 4D1A and the tabulated value for 1.5 mm, then depending on the reference method used and the fusing factor for BS3036, there is an issue with the conductor size.