---
title: "What Is Romex? Electrical Glossary | Daniel Electric"
description: "Romex is a brand name for NM-B cable, the plastic-jacketed cable used for most branch circuits inside homes."
url: https://danielelectric.multisites.ai/glossary/romex
publisher: Daniel Electric
phone: +1-817-481-8606
quote: https://danielelectric.multisites.ai/contact
---

Wiring and circuits

# Romex

Romex is a brand name for NM-B cable, the plastic-jacketed cable used for most branch circuits inside homes.

Romex is Southwire's trade name for nonmetallic-sheathed cable. Many people use the word for any NM-B cable. Southwire says NM-B cable is primarily used in residential wiring as branch circuits for outlets, switches and other loads, with a voltage rating of 600 volts.

See [NM-B cable](https://danielelectric.multisites.ai/glossary/nm-b-cable) for the technical name. Southwire says it may be used for exposed and concealed work in dry locations. Wet or buried runs need other types, such as [direct burial cable](https://danielelectric.multisites.ai/glossary/direct-burial-cable). Sizes follow [wire gauge](https://danielelectric.multisites.ai/glossary/wire-gauge). A licensed electrician should run or repair it.

[Daniel Electric can helpResidential electrician](https://danielelectric.multisites.ai/electrician)

## Related terms

-   [NM-B cable](https://danielelectric.multisites.ai/glossary/nm-b-cable)
-   [Wire gauge](https://danielelectric.multisites.ai/glossary/wire-gauge)
-   [Direct burial cable](https://danielelectric.multisites.ai/glossary/direct-burial-cable)
-   [Copper wiring](https://danielelectric.multisites.ai/glossary/copper-wiring)

## Sources

1.  [Southwire: Romex Brand SIMpull Copper Type NM-B Cable](https://www.southwire.com/wire-cable/building-wire/romex-sup-sup-brand-simpull-sup-sup-copper-type-nm-b-cable/p/63968202)
2.  [Southwire: Romex Brand SIMpull Copper Type NM-B Cable](https://www.southwire.com/wire-cable/building-wire/romex-sup-sup-brand-simpull-sup-sup-copper-type-nm-b-cable/p/63968202)

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