What is UL 662 ?

Title: What is UL 662 and UL 669? A Comprehensive Guide

When it comes to safety and security, the importance of choosing the right products is beyond measure. For instance, when it comes to electrical devices, safety switches are crucial in preventing potential risks associated with electrical malfunctions or failures. Underwriters Laboratories (UL) is a global safety certification organization that establishes safety standards for a wide range of products, including safety switches. In this article, we will take an in-depth look at two such standards: UL 662 and UL 669, and what they represent for manufacturers and users alike.

UL 662: The Ultimate Safety Switch

UL 662 is a technical standard developed by UL that specifies the requirements for electrical safety devices, specifically safety switches. These switches are designed to control power supply and protect against electrical hazards. The primary purpose of UL 662 is to ensure the safety and reliability of safety switches, which are essential for preventing potential risks associated with electrical malfunctions or failures.

Key Requirements of UL 662

Compliance with UL 662 is necessary for manufacturers to obtain UL certification for their safety switches. The following are the key requirements of UL 662:

Electrical Safety: Safety switches must be designed to prevent electrical hazards, such as electrocution, fire, or other incidents.

Reliability: Safety switches must be reliable and perform consistently, even in the face of various operating conditions.

Safety Interrupt: Safety switches must be able to interrupt the power supply to protect against electrical hazards.

Enclosure: Safety switches must be encased to prevent damage from environmental factors, such as moisture, dust, or other contaminants.

Indication: Safety switches must provide clear indication of the power supply status, such as an LED or a switch that trips when the power is on.

Electrical Characteristics: Safety switches must have a clearly defined electrical characteristic, such as a voltage or current rating.

UL 669: The Safety Standard for Commercial Refrigeration Equipment

UL 669 is a technical standard developed by UL that defines the safety requirements for commercial refrigeration equipment, including walk-in coolers, freezers, and refrigerated display cases. The primary purpose of UL 669 is to establish safety standards for commercial refrigeration products, including their electrical and mechanical requirements, to ensure their safety, efficiency, and reliability.

Key Requirements of UL 669

Compliance with UL 669 is necessary for manufacturers to obtain UL certification for their commercial refrigeration equipment. The following are the key requirements of UL 669:

Electrical Safety: Commercial refrigeration equipment must be designed to prevent electrical hazards, such as electrical fires, electrocution, or other incidents.

Electrical Characteristics: Commercial refrigeration equipment must have a clearly defined electrical characteristic, such as a voltage or current rating.

Refrigerant Leakage: Commercial refrigeration equipment must prevent the escape of refrigerant, which can be harmful to humans and the environment.

Door or Window Entrapment: Commercial refrigeration equipment must prevent the door or window from being trapped, which can cause the equipment to overheat or cool to an unsafe temperature.

Contact with Water: Commercial refrigeration equipment must prevent contact with water, which can cause damage to the equipment or introduce water into the electrical circuit.

Maintenance and Repairs: Commercial refrigeration equipment must be designed to allow for regular maintenance and repairs, to ensure that it continues to operate safely and efficiently.

Conclusion

UL 662 and UL 669 are two significant technical standards developed by UL that define the safety requirements for electrical and commercial refrigeration equipment, respectively. Compliance with these standards is necessary for manufacturers to obtain UL certification for their products, indicating that their products meet stringent safety standards. By choosing the right products, manufacturers can ensure the safety and reliability of their equipment, while users can benefit from the safety features that these standards provide.