---
title: "What Is Service mast? Electrical Glossary | Daniel Electric"
description: "A service mast is the rigid pipe that rises above the roofline to hold the overhead service wires at a safe height."
url: https://danielelectric.multisites.ai/glossary/service-mast
publisher: Daniel Electric
phone: +1-817-481-8606
quote: https://danielelectric.multisites.ai/contact
---

Power and utility

# Service mast

A service mast is the rigid pipe that rises above the roofline to hold the overhead service wires at a safe height.

Oncor requires a service mast that supports the service drop to be at least 2 inch rigid steel, or 2.5 inch IMC, conduit with no coupling above the top clamp. It says EMT is not acceptable for a mast. The mast must be tall enough for the wires to meet minimum clearances.

The [service drop](https://danielelectric.multisites.ai/glossary/service-drop) attaches near the top, where a [weatherhead](https://danielelectric.multisites.ai/glossary/weatherhead) keeps rain out. A leaning, rusted or torn mast is a hazard near live wires. Stay clear and call the utility and a licensed electrician. See [electrical checks after a North Texas storm](https://danielelectric.multisites.ai/blog/after-a-north-texas-storm-electrical-checks).

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

## Related terms

-   [Service drop](https://danielelectric.multisites.ai/glossary/service-drop)
-   [Weatherhead](https://danielelectric.multisites.ai/glossary/weatherhead)
-   [Meter base](https://danielelectric.multisites.ai/glossary/meter-base)
-   [EMT](https://danielelectric.multisites.ai/glossary/emt)

## Sources

1.  [Oncor: Electric Service Guidelines](https://www.oncor.com/content/dam/oncorwww/documents/electric-service-guidelines/Electric%20Service%20Guidelines%202021.pdf)
2.  [Oncor: Electric Service Guidelines](https://www.oncor.com/content/dam/oncorwww/documents/electric-service-guidelines/Electric%20Service%20Guidelines%202021.pdf)

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## Need an electrician in Southlake?

Call and tell us what is going on. A photo of the panel label or the problem helps us come prepared. Quotes on new installations are free.

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