What is UL 98B ?

UL 98B is a technical standard established by Underwriters Laboratories (UL) that pertains to the design, construction, and testing of enclosed and dead-front switches intended for use in highly hazardous locations. The purpose of UL 98B is to ensure that these switches meet certain criteria related to their electrical performance, construction, and protection against hazards.

The design and construction of switches are regulated by UL 98B, which outlines the requirements for the switch's electrical performance, including maximum voltage, current, and vibration. The standard also specifies the materials that can be used in the switch's construction, such as plastics and metals, to ensure their durability and resistance to aging and wear.

UL 98B also addresses the testing requirements for the switches, including the procedures for determining their electrical performance, stability, and reliability. The standard specifies the tests that must be performed to ensure that the switch meets the required criteria, such as, overvoltage, overcurrent, and thermal tests.

Compliance with UL 98B is mandatory for manufacturers of switches intended for use in hazardous environments, such as oil and gas fields, chemical plants, and nuclear power plants. The standard provides assurance to end users and regulatory authorities that the switches are safe and reliable, and that they meet the necessary criteria for use in their respective environments.

In conclusion, UL 98B is an important standard that ensures the safety and reliability of enclosed and dead-front switches intended for use in highly hazardous locations. By following the guidelines set forth in UL 98B, manufacturers can ensure that their products are reliable, efficient, and offer sufficient protection against electrical hazards. Compliance with this standard provides confidence to end users and regulatory authorities about the safety and performance of the devices.