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Why does one pin on a three pin plug get really hot?

Updated: 8/19/2019
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10y ago

Best Answer

Either the conductor connection to that pin of the plug is failing-replace the plug

or- the receptacle is old and loose fitting due to metal fatigue-replace the receptacle

or- the conductor termination at the receptacle is loose-tighten or replace receptacle if damaged. Loose connection creates resistance, which equals heat

Answer for UK and other countries using 13 amp square-pin plug:

I had this happen yesterday in a fused plug and cured the problem by opening the plug, taking out the 13 A fuse and squeezing together the fuse sockets with pliers to make the fuse a tighter fit. Then I put the fuse back in. That did the trick (for a UK 13-amp plug with fuse feeding a 2 kW convector).

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Q: Why does one pin on a three pin plug get really hot?
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