---
title: "What Is Wire nut? Electrical Glossary | Daniel Electric"
description: "A wire nut is a twist-on connector with an insulated cap that holds two or more stripped wire ends together inside an electrical box."
url: https://danielelectric.multisites.ai/glossary/wire-nut
publisher: Daniel Electric
phone: +1-817-481-8606
quote: https://danielelectric.multisites.ai/contact
---

Wiring and circuits

# Wire nut

A wire nut is a twist-on connector with an insulated cap that holds two or more stripped wire ends together inside an electrical box.

A wire nut is a cone-shaped cap, usually plastic, that twists over stripped wire ends to hold them together and cover the joint. It is a common way to make a [splice](https://danielelectric.multisites.ai/glossary/splice) inside a [junction box](https://danielelectric.multisites.ai/glossary/junction-box). A loose connection can overheat, so the right type and a firm joint matter.

OSHA's wiring rule says conductors shall be spliced or joined with splicing devices identified for the use. CPSC also warns that twist-on connectors are an inadequate fix for [aluminum wiring](https://danielelectric.multisites.ai/glossary/aluminum-wiring). Boxes should be opened and worked on only by a licensed electrician. See [residential electrician](https://danielelectric.multisites.ai/electrician).

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

## Related terms

-   [Splice](https://danielelectric.multisites.ai/glossary/splice)
-   [Pigtail](https://danielelectric.multisites.ai/glossary/pigtail)
-   [Junction box](https://danielelectric.multisites.ai/glossary/junction-box)
-   [Aluminum wiring](https://danielelectric.multisites.ai/glossary/aluminum-wiring)

## Sources

1.  [OSHA: 1910.303 General requirements](https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.303)
2.  [U.S. Consumer Product Safety Commission: May Is National Electrical Safety Month, Good News for Homeowners](https://www.cpsc.gov/Newsroom/News-Releases/2003/May-Is-National-Electrical-Safety-Month-Good-News-for-Homeowners-Aluminum-Wiring-Fix-Still-Available)

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