The third conductor is bare copper. When you connect the blacks a magnetic field is produced and the white may show hot from the induction voltage to the white wire using a non contact tester.
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Why is white wire hot. When i pulled the existing switch the white wires i assume they were neutral wires were connected to switch. This video is part of the heating and cooling series of training videos made to accompany my. The black wire is the hot wire which provides a 120 vac current source. The additional wire is hot but switched off at the switch. White wires with black or red tape. The black wire is the hot wire.
This one just demonstrates where the power is in a circuit and where you can have a hot neutral. This made me nervous and i wanted to double check which wire was hot. If not then use a different tester that is a contact tester with a light that shows that the voltage is not inductive false to the white wire. It provides the return path for the current provided by the hot wire. It provides a 120 vac current source. These conductors are designated as follows.
In a 110 volt setup an additional wire usually red or blue normally indicates a hot wire controlled by a light switch. It provides the return path for the current provided by the hot wire. Typically this is indicated with a band of black or red electrical tape but other colors may be used wrapped around the wires insulation. The white wire is the neutral wire. The white wire goes to the white metal screws on an electrical outlet. So i tested the wires hot to neutral 125v hot to ground 35v neutral to ground 30v.
Two of the conductors in nmb cable are covered with plastic insulation one white the other black. The copper wire is called the ground wire because it is connected to the earth either directly or through another grounded conductor. Hot when a white wire is augmented with a red or black color marking this often indicates that it is being used as a hot wire rather than a neutral wire. Under those conditions a black wire should be always hot and always on. The white wire is called the neutral wire. This voltage will be false.
Gallery of Why Is White Wire Hot
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