---
title: "UL Listed — what it means"
description: "A complete product tested by Underwriters Laboratories against its safety standard. What the symbol looks like, what happens if you ignore it, and where its meaning "
url: https://atoneplace.net/symbol/electrical-ul-listed/
site: "At One Place"
---

# UL Listed

**UL Listed: A complete product tested by Underwriters Laboratories against its safety standard.**

## What it looks like

The letters UL in a circle, with the word LISTED and a control number beside it.

## What it means

Unlike CE, this is genuine third-party certification: samples were tested and the factory is subject to follow-up inspection. It applies to a finished product for a stated use, and it is a safety mark, not a performance or quality one — a UL Listed appliance is unlikely to start a fire and may still be badly made. In the US, listing by a Nationally Recognized Testing Laboratory is what electrical inspectors look for, and UL is the most common but not the only one.

> Defined by UL certification programme. Where a symbol differs between standards, the difference is described above rather than resolved — both versions are in circulation on real labels.

## Other electrical and appliance symbols

| Symbol | Means |
| --- | --- |
| CE mark | The manufacturer declares the product meets the EU rules that apply to it. |
| UKCA mark | The manufacturer declares the product meets Great Britain's rules — the British counterpart to CE. |
| UL Recognized Component | A component certified for use inside a larger product — not a certification of the finished item. |
| FCC mark | The device meets US limits on radio-frequency interference. |
| RoHS compliant | The product restricts ten hazardous substances, including lead, mercury, cadmium and four phthalates. |
| Crossed-out wheelie bin (WEEE) | Do not put this in household waste — take it to a separate collection for electrical items or batteries. |
| Crossed-out bin with Pb, Cd or Hg | A battery for separate collection which also contains lead, cadmium or mercury above the reporting threshold. |
| Double insulated (Class II) | The appliance is protected by two layers of insulation and needs no earth connection. |
| Protective earth (ground) | This terminal must be connected to the protective earth conductor. |
| IP rating (IP67, IPX4) | How well the enclosure keeps out solids and water. First digit solids 0–6, second digit water 0–9. |
| EU energy label (A to G) | How efficient the appliance is, on a scale from A to G, alongside consumption figures. |
| EnergyGuide label (US) | The estimated annual energy cost of this appliance in the US, and how it compares with the range for its class. |
| Alternating current (AC) | Alternating current. On a power supply it marks the mains input side. |
| Direct current (DC) | Direct current. On a power supply it marks the output side. |
| Barrel jack polarity (centre positive or centre negative) | Which conductor of a barrel plug is positive: the inner pin or the outer sleeve. |

## Common questions

### What does the ul listed symbol mean?

A complete product tested by Underwriters Laboratories against its safety standard.

### What does it look like?

The letters UL in a circle, with the word LISTED and a control number beside it.

## Related pages

- [UL Recognized Component](https://atoneplace.net/symbol/electrical-ul-recognized/)
- [CE mark](https://atoneplace.net/symbol/electrical-ce/)
- [BSI Kitemark](https://atoneplace.net/symbol/cert-kitemark/)
- [CE mark](https://atoneplace.net/symbol/electrical-ce/)
- [UKCA mark](https://atoneplace.net/symbol/electrical-ukca/)
- [UL Recognized Component](https://atoneplace.net/symbol/electrical-ul-recognized/)
- [FCC mark](https://atoneplace.net/symbol/electrical-fcc/)
- [RoHS compliant](https://atoneplace.net/symbol/electrical-rohs/)
- [Crossed-out wheelie bin (WEEE)](https://atoneplace.net/symbol/electrical-weee/)
- [Crossed-out bin with Pb, Cd or Hg](https://atoneplace.net/symbol/electrical-battery-bin/)
- [Double insulated (Class II)](https://atoneplace.net/symbol/electrical-double-insulated/)
- [Protective earth (ground)](https://atoneplace.net/symbol/electrical-protective-earth/)
- [IP rating (IP67, IPX4)](https://atoneplace.net/symbol/electrical-ip-rating/)

## Sources

- Official vendor product documentation — At One Place (/about/)