Is the ridged wire the hot wire?

Answer:
When you are trying to determine which wire is the hot wire then you must assume all of them are. Use a voltmeter to determine which line is hot and which is neutral. Never assume a wire is hot or not because of its identification unless you are very familiar with the circuit.
First answer by ID3230374174. Last edit by ID3230374174. Question popularity: 4 [recommend question].