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Typically the black wire is "hot", and the white wire is neutral. A 2 pole breaker is most commonly used for 240 V, and as such, you would typically use a 3 conductor wire, with black, red and white (+ ground). In a typical application, the black and red are used in the 2 pole breaker, and neutral is connected to the neutral bar in the breaker panel.

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Yes no problem at all. The black conductor is connected to one of the two poles on the breaker. The white wire is connected to the other pole on the two pole breaker. In this situation, the electrical code requires the white wire to be identifies as a current carrying conductor. This is done by wrapping black electrical tape around the white wire. This will let anyone that works on the circuit in the future that the conductor is a current carrying conductor.

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Q: Can you only use white and black wires on a 2 pole breaker?
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