If a junction box is part of an electrical conduit system then it is required to be bonded so as to make the whole electrical conduit system continuously conductive.
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No, just make sure the connections inside are tight and placed under a wire nut and taped up. The junction box must have a lid and it must be assessable at all times.
Can lights have a junction box attached to them. So yes.
Junction box labeling is required by Code (NEC) on boxes containing fire alarm circuits and circuits fed from emergency power panels backed up by generators. However, it is a good trade practice to always label your j-box covers with the circuit voltage and circuit numbers.
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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.