Home Inspection Electrical Practice Test

How can Romex wire be easily identified?

1. It is encased in steel armor

2. It is visibly color-coded

3. It has a plastic casing

4. It consists of multiple strands

The correct answer is: It has a plastic casing

Romex wire, or NM (non-metallic) cable, can be easily identified by its plastic casing, which is typically made of PVC. This casing provides insulation and protection for the conductors inside, and gives Romex its distinctive look. The plastic jacket is available in various colors, indicating the specific type of wire and its gauge. This characteristic makes it not only easy to recognize but also practical for residential wiring applications. The plastic casing helps prevent damage from moisture and mechanical stress, making it suitable for use in a variety of environments. In residential construction, the smooth, non-metallic finish of Romex contributes to its popularity relative to other types of wiring materials.