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60 Amp Junction Box.

Mornin' All,

I came upon a burnt out terminal on a Crabtree ceiling 50 Amp. shower cord switch yesterday. The cables had become so hot after 3 years of use that the line P.V.C. had completely fallen off the conductor and had left a horrible black smelly sticky mess.

I had to replace the shower cord switch, but the damaged cable was then too short after removing the softened copper and damaged insulation.

So I had to make a trap in the room upstairs, which turned out to be wooden boards over other wooden boards to access the cable below with a view to lengthening one cable. I used a new 60 Amp junction box as it allows two large conductors to overlap and be secured by 4 screws. It is solid and of good quality.

It is this item.....

https://www.toolstation.com/60a-junction-box/p98775?store=N2&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMIufLP1ZD25gIVybTtCh2YWAeiEAQYASABEgJZkvD_BwE

Z.

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0 AJJewsbury over 5 years ago

There is a world of difference in a 40 Amp. shower load and a lighting load of a few L.E.D. lamps Andy, as well you know. The possible heating effects are totally different. You are cross threaded. There is no way that the lighting cables could contact the metal light switch plate insulted or uninsulated due to physical separation.

Ah, you've been telling us half a story then. You never mentioned the the lighting circuit for that metal switch was dedicated to just a few LED fittings - there are still enough GLS lamps and 50W halogen downlighters about that we can't safely assume that a lighting circuit can't be significantly loaded. I'd dispute that the heating effect will be totally different - while the load currents will certainly be smaller, the conductor size will also be substantially smaller - so requiring much less heat to reach a damaging temperature. Sure you'd need a higher resistance to produce the same I²R - but what limits the resistance of a bad contact or loose connection? You also haven't mentioned the physical separation before (despite me describing the possibility in the other thread) - if you do have a way of ensuring that, that would be reassuring.

- Andy.
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0 AJJewsbury over 5 years ago

There is a world of difference in a 40 Amp. shower load and a lighting load of a few L.E.D. lamps Andy, as well you know. The possible heating effects are totally different. You are cross threaded. There is no way that the lighting cables could contact the metal light switch plate insulted or uninsulated due to physical separation.

Ah, you've been telling us half a story then. You never mentioned the the lighting circuit for that metal switch was dedicated to just a few LED fittings - there are still enough GLS lamps and 50W halogen downlighters about that we can't safely assume that a lighting circuit can't be significantly loaded. I'd dispute that the heating effect will be totally different - while the load currents will certainly be smaller, the conductor size will also be substantially smaller - so requiring much less heat to reach a damaging temperature. Sure you'd need a higher resistance to produce the same I²R - but what limits the resistance of a bad contact or loose connection? You also haven't mentioned the physical separation before (despite me describing the possibility in the other thread) - if you do have a way of ensuring that, that would be reassuring.

- Andy.
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60 Amp Junction Box.

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