Power Strips

A power strip is a device that provides multiple electrical outlets, often used at home or in the office.

Power Strips May Have Switches

Some power strips include a built-in on/off switch that cuts power to all connected devices at once. Others do not have a switch and are always on when plugged in.

Live Wire, Neutral Wire, and Ground Wire

Live wire: carries electricity to the device. It is usually colored red or brown in many countries.

Neutral wire: completes the circuit by returning the current. It is usually colored blue.

Ground wire: provides a safe path if something goes wrong. It is usually colored yellow-green striped.

In the U.S., the live wire is often black, neutral is white, and ground is green or bare.

In the U.K., live is brown, neutral is blue, and ground is green-yellow striped (similar to China).

Two-prong vs. Three-prong Outlets

Three-prong outlets: support plugs with a ground pin (live, neutral, ground). They are safer and recommended for devices that require grounding.

Two-prong outlets: do not have a ground connection. They can only be used with two-prong plugs. These plugs are usually for double-insulated devices that do not require grounding, such as phone chargers or lamps.

Matching Plugs and Outlets

A power strip itself has a plug that connects to the wall outlet, and it provides multiple outlets (prongs) for other devices to plug into.

If a power strip has three-prong outlets, it is designed to support devices that require grounding. However, some power strips may have a two-prong plug (without ground) while offering three-prong outlets. This is not compliant with safety standards, as the ground connection is missing.

You should avoid using power strips with three-prong outlets but only a two-prong plug, since devices plugged into the ground pin will not actually be grounded, reducing electrical safety.