UL, CSA, ETL & CE: What Do They Stand For?

Look at the label on any grow light, fan, controller or heater and you will usually find one or more of these marks. They are not interchangeable. Three of them, UL, ETL and CSA, mean an independent lab tested the product to North American safety standards. The fourth, CE, means something different.

UL: Underwriters Laboratories

UL is the best-known safety mark in the US. A UL Listed product was tested by UL to the safety standard for that kind of product, and the factory that builds it is inspected on an ongoing basis so production keeps matching the sample that was tested. UL Recognized is a different mark: it applies to components inside a product, not to the finished product.

ETL: Intertek

The ETL Listed Mark comes from Intertek, a lab that traces its history to Thomas Edison’s Electrical Testing Labs. Like UL, Intertek is a Nationally Recognized Testing Laboratory (NRTL) under OSHA, and ETL-listed products are tested to the same published standards, often the UL standards themselves. For code compliance, an ETL listing does the same job as a UL listing.

CSA: CSA Group

CSA Group began as the Canadian Standards Association. It is also an OSHA-recognized NRTL, so a CSA mark can show compliance with US standards as well as Canadian ones. The small C and US markings next to a certification mark tell you which countries it covers: cULus, cETLus and CSA C/US marks cover both.

CE: Conformité Européenne

CE is the manufacturer’s declaration that a product meets European Union requirements. For most electrical products the manufacturer makes that declaration without an independent lab test. CE is required to sell in Europe, but it is not a US safety listing and does not stand in for UL, ETL or CSA.

Why it matters in a grow room

• Grow lights, fans, heaters and dehumidifiers run for long hours, often at high wattage, in warm, humid rooms.
• Electrical inspectors, landlords, insurers and licensed facilities commonly expect equipment listed by an NRTL such as UL, ETL or CSA.
• A CE mark on its own tells you a product was declared for the European market, not that it was tested to US standards.
• DLC listing is a separate thing again: it covers efficiency, not safety, and it is what many utility rebates for LED grow lights require.

Check the label and the spec sheet for the listing mark before you buy, especially for lights and anything that plugs into a controller. Questions about a specific light or piece of equipment? Ask us in Webster or Milford, or call 508-461-5850.