Used to connect wires together and cover them for safety. Junction boxes must never be installed anyplace they cannot be accessed at any time.
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Can lights have a junction box attached to them. So yes.
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A 240 volt wire is the insulation factor of the wire. If you mean a 240 supply source from a distribution panel to a junction box then the answer is yes. You have to keep in mind that the box has to be accessible, meaning that you can get to the box to check the splice within the box. Don't bury the junction box behind the wall board.
The wire nuts do not have to be inside the junction box. They must, however, be as tight as possible to keep moisture from inside the light fixture.
You can use the junction box to send power outside to another building as long as you do not overload the circuit. Other than that there is no real benefit.