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Question: electrical wiring help?


Question by Maccaf zylene: electrical wiring help?
i was to arrange 10 long series of decoration LED lights in a room. (one series contains a main plug/jack/two pin connector, from which two wires comes out and extends to 2-3 meters and several small LED bulbs are attached to this long wire across its length).

i had only one switchboard in room so i can connect only one 2-pin to its socket. I purchased a long aluminium and copper electrical wire(separately) and a cut them at particular lengths (according to my needs) so that i had around 12 pieces(around 8 pieces of aluminum wire and 4-6 copper wire) and attached these pieces to the jack/2 pin of every series. after that i took all line wires ( i assumed) of all series and joined them into one by an insulation adhesive tape. then I did this for all neutral wires and joined them.
so now I have only one wire for line and one wire for neutral .
then I screwed both wires into a new 2-pin and plug it into its socket on switchboard and switched it on. Result was just fine and i had a glowing room with a beautiful lighting decoration.

But just after half an hour, when I touched the wire (the aluminum wire which i d purchased for extention and connections), i felt it very hot.!!! and there was smell of melting plasting coating.
after 2 hrs , when it became extrmely hot, i switched it off and switched on after 10 minutes. this time when i switched on, it sparked ,burnt and my home power supply went off. I checked the main board and i found my MCB( circuit breaker) with turned off position. I reset it and power was back again.

so my ques are:
1. why only in half an hour , wire became so hot. – is this b’cuz of using both aluminium and copper during joing and extention.?
2. why second time when i switched on, sparking occured and line went offf—- were those all connections drawing a very big voltage.
3. does poor joining of wires with an adhesive insulation tape play any role in such situations.
4. what is the best way to connect several plugs into one socket.( as my this method went wrong).

Best answer:

Answer by texasmaverick
It sounds like you had a very poor connection where you connected the wires using tape. This will create a high resistance at that point. Then depending on the actual current flowing through the circuit (I don’t know what 10 long strings of LED lamps will pull), the connection points will act as a heater due to the high-resistance connection.

Assume the resistance of the connection was 2 ohms and you were drawing 10 amperes (1 amp per string), the amount of heat produced at the connection point would have been watts = Current square times resistance. This would have been 200 watts. The end result would have been the overheating and melting of the insulation at the connection point (hot and neutral) and eventually the hot and neutral would have touched and cleared the circuit breaker.

Always use a screw-type mechanical connector for connecting wire.

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