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 ensures that these devices meet certain criteria related to their electrical performance, construction, and protection against hazards.

The Purpose of UL 98

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.

Key Requirements of UL 98

UL 98 covers various aspects of disconnect switches, switch-fuse combinations, and circuit-breaker switches that need to be considered during the design, manufacturing, testing, and certification processes. Some of the key requirements include:

Electrical Performance: The devices must have appropriate current and voltage ratings, as well as demonstrate satisfactory performance under normal and fault conditions. They should be able to interrupt currents safely and effectively.

Construction: The devices must be built using materials that are suitable for electrical applications and capable of withstanding the environmental conditions they will be exposed to. The construction should also facilitate proper installation and allow for easy operation.

Protection Against Hazards: UL 98 requires measures to protect against electric shock, fire hazards, and other potential risks. This may include features such as arc-flash containment, overcurrent protective devices, and proper insulation.

UL 98 Certification

To demonstrate compliance with UL 98, manufacturers can seek certification from accredited testing laboratories. The certification process involves thorough evaluation of the product's design, performance, and manufacturing practices. Upon successful completion, the product can bear the UL mark, indicating its compliance with the safety requirements outlined in UL 98.

In conclusion, UL 98 is a crucial standard that ensures the safety and reliability of disconnect switches, switch-fuse combinations, and circuit-breaker switches. This standard sets forth guidelines for electrical performance, construction, and protection against hazards. Compliance with UL 98 provides confidence to end users and regulatory authorities that these devices meet stringent safety requirements.