What is UL 877?

UL 877, also known as "Standard for Electrical Metallic Tubing," is a set of safety standards established by Underwriters Laboratories (UL), an independent product safety certification organization. It specifically regulates the installation and use of electrical metallic tubing (EMT) in commercial and industrial settings.

The Purpose of UL 877

The main purpose of UL 877 is to ensure the safety and reliability of electrical systems that incorporate EMT. This standard provides guidelines for manufacturers, electricians, and inspectors to follow when using EMT for conduit installations. By adhering to UL 877 requirements, professionals can mitigate potential electrical hazards, reduce the risk of fire, and enhance the overall safety of electrical infrastructure.

Requirements of UL 877

UL 877 specifies various requirements that EMT products must meet to receive UL certification. These requirements include dimensional tolerances, mechanical strength, corrosion resistance, and electrical grounding capabilities. Additionally, certain tests are conducted to evaluate the performance of EMT under different conditions, such as humidity, temperature, and physical impact. Manufacturers must comply with these requirements to ensure their EMT products are safe for use in accordance with UL 877.

Benefits of Compliance with UL 877

Compliance with UL 877 offers several benefits for manufacturers, electricians, and end-users. Firstly, it reassures customers that the EMT products they purchase have undergone rigorous testing and meet recognized safety standards. This helps build trust in the quality and reliability of the electrical system. Secondly, using UL 877-compliant EMT ensures that installations are consistent with industry best practices, reducing the risk of electrical accidents or failures. Lastly, compliance with UL 877 may be a requirement for obtaining necessary permits and approvals from regulatory authorities, making it essential for staying compliant with local electrical codes.