Yes, but there is room for eight cables - grouping?
Where on earth did "eight cables" come from? - there's only provision to terminate 4 conductors in each of the terminal blocks.Yes, but there is room for eight cables - grouping?
There's room for two cables at each clamp (five cables can be fitted in 501s).Where on earth did "eight cables" come from? - there's only provision to terminate 4 conductors in each of the terminal blocks.
That I would not dispute. However, as I keep saying, if there were a risk of "overheating" (particularly to the extent of damaging the enclosure) as a result of current through the sprung terminals, then I would be very worried about the adequacy of those terminals.It's probably good to try to stop the MF JBs overheating, they don't seem to like heat. ...
I can't answer the question about the origin or meaning (if any) of the product numbers, other than to say that it would make absolutely no sense for it to mean that they are designed for 8 cables (even though 8 cables would fit in the clamps) - since, if one had 8 cables, half of the conductors would have 'nowhere to go'!I know there aren't enough conductor terminals but ... Just thought, is that why they are 501 and 803/4?
I think you'll find I said that in my last post.since, if one had 8 cables, half of the conductors would have 'nowhere to go'!
Quite. Unless your thermal imaging camera is pretty sensitive, I suspect that you might struggle to see any temperature rise at all (let alone any rise that could conceivably damage the JB), even if it were buried in insulation. If the terminals are even half decent, I would also suspect that the same would be true for currents appreciably higher than 32A.not at all, I might have to shove 32A through a new pair and peer at them with the thermal imaging camera.
You did, and I quoted it ... which is why I don't understand why you seem to be suggesting that the '8' of the product number might mean that it was designed to be used with 8 cables!I think you'll find I said that in my last post.
It's probably good to try to stop the MF JBs overheating, they don't seem to like heat. The MF JB was heated gently with a small flame from a gas torch, the round one was blasted for a substantial time with the flame at full power. The MF one although fairly heat resistant ignited, but self extinguished after giving off lots of stinking black smoke, the round one I could not ignite and it only scorched.
Sorry for the blurry pics!
View attachment 105813 View attachment 105814
strip..., push it in hard and you can't go wrong. Give it a good tug...
Possibly, at least in their minds, but that good reason could be that it sounds like a good way of protecting their backsides. Maybe I'm wrong, but I really would not have thought that the terminals of any sort of JB carrying 32A through each of three sets of terminals should get even remotely warm/hot, even if deeply buried in insulation.There must be some reason why it says in big letters not to cover with thermal insulation.
I thought thermal imagining cameras were designed to be sensitive, so you can see for example where the heat is leaving your house?Quite. Unless your thermal imaging camera is pretty sensitive, I suspect that you might struggle to see any temperature rise at all (let alone any rise that could conceivably damage the JB), even if it were buried in insulation. If the terminals are even half decent, I would also suspect that the same would be true for currents appreciably higher than 32A.
Kind Regards, John
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