It provides a 120 vac current source. 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.
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Why is white wire hot. This voltage will be false. So i tested the wires hot to neutral 125v hot to ground 35v neutral to ground 30v. It provides the return path for the current provided by the hot wire. The white wire is the neutral wire. The copper wire is called the ground wire because it is connected to the earth either directly or through another grounded conductor. It provides the return path for the current provided by the hot wire.
White wires with black or red tape. 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 third conductor is bare copper. Under those conditions a black wire should be always hot and always on. The black wire is the hot wire which provides a 120 vac current source. The white wire goes to the white metal screws on an electrical outlet.
The additional wire is hot but switched off at the switch. This video is part of the heating and cooling series of training videos made to accompany my. 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. This one just demonstrates where the power is in a circuit and where you can have a hot neutral. When i pulled the existing switch the white wires i assume they were neutral wires were connected to switch. This made me nervous and i wanted to double check which wire was hot.
In a 110 volt setup an additional wire usually red or blue normally indicates a hot wire controlled by a light switch. The black wire is the hot wire. These conductors are designated as follows. 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. The white wire is called the neutral wire. Two of the conductors in nmb cable are covered with plastic insulation one white the other black.
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