Technological Innovation

What is UL 60335-2-91?

UL 60335-2-91 is a technical standard developed by Underwriters Laboratories (UL) for the safety of household and similar electrical appliances. It specifically focuses on appliances that generate heat, such as electric heaters, toasters, and hair dryers. This standard sets forth requirements for the construction, performance, and testing of these types of appliances to ensure their safe use.

Importance of UL 60335-2-91

UL 60335-2-91 plays a crucial role in ensuring the safety of consumers using household electrical appliances. The standard helps manufacturers design, build, and test their products to meet specific safety requirements. Compliance with this standard allows consumers to identify appliances that have undergone rigorous testing and quality control measures to minimize the risk of electrical hazards, fires, or other accidents caused by faulty or substandard appliances.

Requirements of UL 60335-2-91

The requirements outlined in UL 60335-2-91 cover various aspects of appliance safety. These include protection against electric shock, mechanical hazards, overheating, abnormal operation, and insulation resistance. The standard defines specific tests that must be performed, such as temperature-rise tests, leakage current measurements, and endurance tests, to verify compliance with safety standards. Appliances must also feature appropriate warning labels and instructions for safe installation, operation, and maintenance.

Compliance and Certification

In order to demonstrate compliance with UL 60335-2-91, manufacturers must submit their appliances for evaluation and testing by accredited laboratories. These laboratories assess the appliances against the requirements outlined in the standard and issue certification if the products meet all safety criteria. Consumers can look for the UL mark on appliances, indicating that they have undergone testing and comply with the safety regulations set forth by UL 60335-2-91.



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