What is UL 679 ?

Title: A Beginner's Guide to UL 676: The Technical Standard for Electric Air Heaters

Introduction:

Electric air heaters are widely used in various industrial and commercial applications for their ability to provide controlled heating solutions. However, the use of electric heaters can pose a safety risk if not properly installed, maintained, or inspected. To address these concerns, UL (Underwriters Laboratories) has established UL 676, a technical standard that defines the requirements for electric air heaters. In this article, we will provide an overview of UL 676, including its purpose, key requirements, and the significance of this standard in the electrical industry.

What is UL 676?

UL 676 is a technical standard published by Underwriters Laboratories (UL) that outlines the requirements for manufacturers to certify their electric air heaters. The primary purpose of UL 676 is to ensure the safety and performance of electric air heaters, while also providing guidelines and criteria for their design, installation, and maintenance.

Key Requirements of UL 676

UL 676 sets out several key requirements for electric air heaters, including:

Electrical Safety: The standard specifies the maximum voltage and current ratings for electrical components, as well as the use of listed components for electrical safety.

Heating Performance: The standard outlines the thermal performance requirements for electric air heaters, including the maximum heat output, heat distribution, and thermal efficiency.

Safety Protection: The standard requires electric air heaters to have safety features such as overheating protection, automatic shut-off, and flame-retardant materials.

Electrical Connections: The standard specifies the electrical connections required for electric air heaters, including the use of insulated and grounded wiring.

Product：UL 676 requires manufacturers to provide clear and concise labeling and documentation for their electric air heaters, including information on the maximum heat output, thermal efficiency, and voltage ratings.

UL 676 and the Electrical Industry

UL 676 is an essential standard for the electrical industry, ensuring the safety and reliability of electric motors for various applications. The standard has been revised several times to adapt to the changing technological landscape. The first revision of UL 676 was published in 1954, and since then, several revisions have been published, including 1976, 1996, and 2012.

Conclusion

UL 676 is a technical standard published by Underwriters Laboratories that outlines the requirements for manufacturers to certify their electric air heaters. The standard aims to ensure the safety and performance of electric air heaters, while also providing guidelines and criteria for their design, installation, and maintenance. UL 676 is an essential standard for the electrical industry, ensuring the safety and reliability of electric motors for various applications.