What is UL 87?

In the field of electrical engineering, UL 87 is a well-known standard that pertains to electrically insulated wire and cable. It sets specific requirements for various characteristics such as insulation thickness, voltage rating, temperature rating, and conductor size. UL 87 is developed and maintained by Underwriters Laboratories (UL), an independent organization that conducts safety certification and testing for a wide range of products.

The Purpose of UL 87

The primary purpose of UL 87 is to ensure the safety and reliability of insulated wires and cables used in electrical systems. By adhering to the standards outlined in UL 87, manufacturers can provide products that meet the minimum safety requirements necessary for their intended applications.

Components of UL 87

UL 87 covers several important aspects related to electrical wires and cables. These include:

Insulation Thickness: The standard sets forth specific thickness requirements for different types of insulation materials, ensuring sufficient resistance to electrical current flow.

Voltage Rating: UL 87 establishes voltage ratings based on factors like peak operating voltage, maximum continuous voltage, and overvoltage protection requirements.

Temperature Rating: Different wire and cable insulation materials have varying temperature limits, and UL 87 defines temperature ratings to ensure safe operation under normal and abnormal conditions.

Conductor Size: The standard specifies the minimum and maximum allowable sizes of conductors, which are important for preventing overheating and maintaining electrical conductivity.

Benefits of Complying with UL 87

Compliance with UL 87 offers several benefits for manufacturers, installers, and end-users:

Safety: Adhering to UL 87 ensures that wires and cables used in electrical systems can handle the specified voltage levels without the risk of fire, shock, or other hazards.

Reliability: UL 87-compliant products have undergone rigorous testing and meet industry standards, which enhances their reliability in various applications.

Code Compliance: Many local building codes require the use of UL-listed products, including those governed by UL 87, making compliance necessary to avoid code violations.

Product Acceptance: UL certification provides a stamp of approval that facilitates the acceptance of products within the electrical industry, leading to wider market acceptance.