A load wire is the wire that carries electricity from an electrical switch, outlet, or other control point to the device or appliance it powers. In simpler terms, it's the wire that delivers the electricity to the "load," such as a light fixture, appliance, or other electrical component.
Deeper Explanation
The load wire's function is best understood when compared to the "line" wire (also sometimes called the "hot" or "supply" wire). The line wire brings power to the switch or outlet, while the load wire carries the power from the switch or outlet to the device being powered. Think of it as the return path or "output" side of a switch.
Example: Light Switch Circuit
Consider a simple light switch circuit:
- Line Wire (Hot Wire): This wire brings power from the circuit breaker to the light switch.
- Switch: The switch acts as a gate, either allowing or stopping the flow of electricity.
- Load Wire: When the switch is "on," the load wire carries the electricity from the switch to the light fixture, causing it to illuminate. When the switch is "off," the circuit is broken, and no electricity flows through the load wire to the light.
Key Characteristics
- Function: Delivers power from a control point (switch, outlet, etc.) to a device.
- Connection: Connected to the output terminal of a switch or control device and the input terminal of the load.
- Testing: When a circuit is energized and the switch is on, a multimeter should show voltage on the load wire.
- Safety: Always de-energize the circuit at the breaker before working with any wiring, including load wires.
Importance of Proper Wiring
Correctly identifying and connecting the load wire is crucial for safe and functional electrical circuits. Incorrect wiring can lead to malfunctions, short circuits, or even fire hazards.
