Three-wire system

Definition

A three-wire system is an electrical wiring configuration that uses two live (hot) wires and one neutral wire for distributing electricity. It is commonly used in residential and commercial buildings to provide both 120V and 240V power.

5 Must Know Facts For Your Next Test

1. The three-wire system can deliver both 120V and 240V, which is essential for operating different types of household appliances.
2. The neutral wire in a three-wire system acts as a return path for the current, ensuring the circuit is complete.
3. This wiring system enhances electrical safety by providing a means to balance the electrical load across two hot wires.
4. The National Electrical Code (NEC) mandates specific color codes: typically black or red for hot wires, white for neutral, and green or bare copper for ground.
5. Improper installation or damage to any of the wires in a three-wire system can lead to serious electrical hazards such as electric shock or fire.

Review Questions

• What are the primary components of a three-wire system?
• How does the three-wire system enhance safety in household electrical circuits?
• Why is it important to follow NEC color coding standards when installing a three-wire system?

Related terms

Ground Wire: A wire that provides a path to earth, helping to prevent electric shock by dissipating excess electricity safely into the ground.

Circuit Breaker: An automatic device designed to stop the flow of electricity in a circuit as a safety measure when an overload or short circuit occurs.

Electrical Load: $\text{Any device or appliance that consumes electrical power within an electrical circuit.}$