---
title: "What Is Transformer? Electrical Glossary | Daniel Electric"
description: "A transformer is a device that changes electric voltage from one level to another, such as from the lines on the street to service voltage."
url: https://danielelectric.multisites.ai/glossary/transformer
publisher: Daniel Electric
phone: +1-817-481-8606
quote: https://danielelectric.multisites.ai/contact
---

Power and utility

# Transformer

A transformer is a device that changes electric voltage from one level to another, such as from the lines on the street to service voltage.

OSHA's glossary says distribution transformers reduce the voltage of the primary circuit to the voltage required by customers. The gray box on the ground or the can on a pole near a building is usually one of these.

The same glossary notes three-phase pad mounted transformers serve underground primary circuits. Utilities usually own and service outdoor transformers, up to the [service drop](https://danielelectric.multisites.ai/glossary/service-drop) or [service lateral](https://danielelectric.multisites.ai/glossary/service-lateral). Never touch one. See [Oncor](https://danielelectric.multisites.ai/glossary/oncor).

[Daniel Electric can helpCommercial electrician](https://danielelectric.multisites.ai/commercial-electrician)

## Related terms

-   [Service drop](https://danielelectric.multisites.ai/glossary/service-drop)
-   [Service lateral](https://danielelectric.multisites.ai/glossary/service-lateral)
-   [Three-phase power](https://danielelectric.multisites.ai/glossary/three-phase-power)
-   [Oncor](https://danielelectric.multisites.ai/glossary/oncor)

## Sources

1.  [OSHA: Electric Power Generation, Transmission, and Distribution eTool glossary](https://www.osha.gov/etools/electric-power/glossary-terms)
2.  [OSHA: Electric Power Generation, Transmission, and Distribution eTool glossary](https://www.osha.gov/etools/electric-power/glossary-terms)

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