What is UL 98 ?

UL 98 is a standard established by Underwriters Laboratories (UL) that pertains to the safety requirements for disconnect switches, switch-fuse combinations, and circuit-breaker switches. The UL 98 standard is designed to ensure that these devices meet certain criteria related to their electrical performance, construction, and protection against hazards.

The main purpose of UL 98 is to provide a consistent set of safety requirements for disconnect switches, switch-fuse combinations, and circuit-breaker switches. These devices play a critical role in electrical systems, allowing for the safe disconnection of power to equipment or circuits for inspection, maintenance, or emergencies.

By following the guidelines set forth in UL 98, 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.

UL 98 is a widely recognized standard that is used to ensure the safety of a wide range of electrical products, including disconnect switches, switch-fuse combinations, and circuit-breaker switches. The standard is divided into two categories: "Type I" and "Type II."

UL 98 Type I is intended for use in applications where the failure of the device could lead to the injury or death of a person. This type of standard is typically used for critical applications, such as power plants, hospitals, and other facilities where the safety of personnel is critical.

UL 98 Type II is intended for use in applications where the failure of the device could cause property damage, but not the injury or death of a person. This type of standard is typically used for non-critical applications, such as residential and commercial buildings.

To ensure compliance with UL 98, manufacturers must conduct testing to verify that their products meet the safety requirements of the standard. The testing typically includes tests for electrical continuity, insulation resistance, and voltage drop, among others.

Compliance with UL 98 is often required by regulatory authorities, such as the Occupational Safety and Health Administration (OSHA) in the United States. The standard is also widely recognized by manufacturers, suppliers, and installers of electrical equipment.

In conclusion, UL 98 is an important standard that ensures the safety of disconnect switches, switch-fuse combinations, and circuit-breaker switches. Compliance with the standard is often required by regulatory authorities and manufacturers, and the standard provides a consistent set of safety requirements for electrical products.