What is UL 926?

UL 926 is a standard that specifies the requirements for safety standards and tests for Industrial Control Panels (ICPs). This article will provide an in-depth of UL 926, including its purpose, scope, and key provisions.

Scope

The scope of UL 926 covers ICPs intended for general-purpose use in accordance with the National Electrical Code (NEC), which includes panels used in industrial facilities, commercial buildings, and certain hazardous locations. The standard applies to complete ICP assemblies as well as subassemblies, such as panelboards, motor control centers, and power distribution blocks.

Purpose

The primary purpose of UL 926 is to ensure the safe construction and operation of ICPs. It establishes minimum performance and safety requirements, focusing on aspects such as electrical shock hazards, fire hazards, and mechanical hazards. Compliance with UL 926 provides assurance that an ICP has been tested and evaluated according to recognized industry standards.

Key Provisions

UL 926 outlines several key provisions that manufacturers must adhere to in order to achieve compliance. These provisions include:

- Markings and product identification: ICPs must be clearly marked with essential information such as ratings, warnings, and manufacturer details.

- Short-circuit withstand ratings: ICPs must be capable of safely handling short circuit currents without causing excessive damage or hazards.

- Insulation coordination: Adequate measures must be taken to prevent insulation breakdown and maintain reliable operation under normal and abnormal conditions.

- Grounding and bonding: Proper grounding and bonding techniques should be employed to minimize electrical shock hazards and ensure effective fault current paths.

- Overcurrent protection: ICPs must be equipped with suitable overcurrent protective devices to prevent damage from excessive currents and short circuits.

These provisions, along with various other requirements specified in UL 926, work together to enhance the safety of ICPs, protecting both users and property from potential hazards.