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Terminal Burn Out.

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There are some nice pictures here if you scroll down, of a terminal burn out, probably caused by a loose terminal screw. Nice old Crabtree stuff is virtually bomb-proof.

https://www.pistonheads.com/gassing/topic.asp?h=0&f=207&t=1953307

Oh, and do we need pre-main switch arc fault detection devices?

There seems to be evidence of  heat build up but no fire in this case.

Z.

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    I have read a lot of American stuff about AFDDs and the assumptions in the justification for AFDDs, fire statistics etc is that all electrical fires are caused by arcing. 

    Is this the case? If there is a poor connection with oxidation generating heat will there be an arc? This is a genuine question and I am hoping someone on the forum knows. I have seen a few badly overheated terminals and I am not sure that there was necessarily signs of arcing. I would expect to see bits of molten metal or holes in either the conductor or the connector from loss of metal to the arc and I have not seen these in most cases. 

    Over the years I have found a few but not many loose connections on incoming tails. A neighbour recently suffered a loss of power. It turned out to be a loose neutral connection in the recently fitted smart meter, he got a £30 credit from his supplier for the inconvenience! Not enough to cover my Sunday callout charge if I had charged him. 

    Looking at the thread on the fire after a EV charger had been installed. How many of us can guarantee that we have always  checked all CU connections when working on a CU?

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  • 0

    I have read a lot of American stuff about AFDDs and the assumptions in the justification for AFDDs, fire statistics etc is that all electrical fires are caused by arcing. 

    Is this the case? If there is a poor connection with oxidation generating heat will there be an arc? This is a genuine question and I am hoping someone on the forum knows. I have seen a few badly overheated terminals and I am not sure that there was necessarily signs of arcing. I would expect to see bits of molten metal or holes in either the conductor or the connector from loss of metal to the arc and I have not seen these in most cases. 

    Over the years I have found a few but not many loose connections on incoming tails. A neighbour recently suffered a loss of power. It turned out to be a loose neutral connection in the recently fitted smart meter, he got a £30 credit from his supplier for the inconvenience! Not enough to cover my Sunday callout charge if I had charged him. 

    Looking at the thread on the fire after a EV charger had been installed. How many of us can guarantee that we have always  checked all CU connections when working on a CU?

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