An image of an opened AC plug, with three wires

The red copper wire was burned so I took out the burnt part of the wire and reinserted all the wires by myself.

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    Why is the bare part of the red wire sticking way out and through like that? Why isn't it like the others? – Harper - Reinstate Monica May 13 at 23:31
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    Please provide a picture of the finished result. There are currently three serious errors which need to be confirmed as having been corrected before it can be deemed safe. – Tetsujin May 14 at 7:56
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    For safety reasons make sure the ground (yellow/green wire) is longer than the other two. In case someone pulls on the cable the ground wire should always be the last one which fails. – Michael May 14 at 10:57
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    @Carl I'd say it's a plug, since it's on the end of a wire and appears to have prongs rather than holes (I assume - not familiar with UK electrical and we can only see the back of this one.) To me (US English) a socket is interchangeable with outlet or receptacle - it's a hole that something goes into, not something that goes into a hole. (Think "eye socket", "ball and socket", "socket wrench", etc.) – Darrel Hoffman May 14 at 18:57
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    You should also make sure you know why the wire burned in the first place and make sure the situation cannot repeat. – Jeffrey May 15 at 3:21

You should trim the extra copper off it will not help to have it hanging out there. You also need to make sure when you put things back together the clamp is on the covering for the cable not the individual wires but other than those items I would say it looks safe. A proper torque would be needed to be 100%.

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    make sure all the clamps are tight. chances are the red one came loose, thus the reason it arced. – Scott May 14 at 0:27
  • It looks like there was some solder on the other wires - never seen a setup like that (screw terminal + solder) - maybe it helps hold it in place? – htmlcoderexe May 14 at 8:02
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    If the wires have solder on them, then they should be trimmed back to bare wire. Solder + screw joints is a very bad idea because the solder will (slowly) flow, thereby loosening the joint over time and allowing arcing. In fact as the remaining wires appear to possibly have solder on them, this is probably what caused the fault in the first place. – SiHa May 14 at 11:10

It would be a cleaner installation to not allow the wire to stick out very far on the far side (looking at you red wire). Make sure that there is only copper under the clamp for the red wire and no insulation under the screw and cramp (it looks like it's pushed in too far)

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  • The comment about insulation seems to contradict the other answers – Kai May 14 at 13:37
  • People may be using ‘clamp’ to mean different things… The screw-down strip at the bottom of the plug that holds the whole cable in place (which is what I'd call the clamp) should go over the white outer insulation, not the separate coloured insulation on each wire. But the terminal pins and their screws should hold only bare wire, not insulation (and, as someone else pointed out, not even solder). – gidds May 14 at 14:51
  • yes thanks @gidds for clarifying the words I used, I do mean that bare wire should be under the terminal pins – Ack May 14 at 14:57
  • @gidds - "The screw-down strip at the bottom of the plug that holds the whole cable in place (which is what I'd call the clamp) - called the 'cable grip' in this context in the UK – Michael Harvey May 14 at 20:31

The wires are way too long, they need to be shortened and the sheath of the flex needs to be secured under the cord grip. The stripped section at the end of the wire should be long enough that the screw can properly clamp down on it but not excessively long.

Ideally the live wire should have no slack the neutral wire a medium amount of slack and the earth wire should have the most slack. This way in the unlikely event that the cord grip fails and the cable gets ripped out of the plug the wires should become disconnected in the safest possible order.

Also personally I would not reuse a plug that had shown signs of heat damage.

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