What is UL 651 ?

Title: What is UL 651 and UL 658? A Comprehensive Overview

Introduction:

UL (Underwriters Laboratories) is a globally recognized independent safety science company that develops and publishes various standards, such as UL 651 and UL 658. These standards are designed to ensure the safety, reliability, and suitability of various products, including rigid polyvinyl chloride (PVC) conduit systems and industrial control equipment. In this article, we will provide a comprehensive overview of both UL 651 and UL 658, including their history, purpose, and requirements.

UL 651-A: A Technical Specification for Rigid PVC Conduit Systems

1. Introduction

UL 651-A is a technical specification published by Underwriters Laboratories (UL) for rigid PVC conduit systems. It is designed to ensure the safety, reliability, and suitability of these systems, which are commonly used in the electrical industry for various applications, such as power distribution, lighting, and data communication.

2. History and Purpose

UL is a globally recognized independent safety science company that develops and publishes various standards, including UL 651-A. The purpose of UL 651-A is to provide a more streamlined and up-to-date set of requirements for the design and manufacturing of rigid PVC conduit systems, which are essential for ensuring the safety and reliability of electrical installations.

3. Key Components of UL 651-A

UL 651-A covers various aspects of rigid PVC conduit systems, including the materials used, the design and construction of the system, and the testing and inspection procedures. The standard consists of multiple sections, each covering a specific aspect of the system design and construction.

* Chapter 1: General Requirements

This chapter provides general requirements for the design, manufacture, and testing of rigid PVC conduit systems. It includes requirements for the materials used, the design and construction of the system, and the testing and inspection procedures.

* Chapter 2: Material Requirements

This chapter provides requirements for the materials used in the rigid PVC conduit system, including the、、、、、、、.* Chapter 3: Design and Construction

This chapter provides requirements for the design and construction of the rigid PVC conduit system, including the、、、、、、、.* Chapter 4: Electrical Characteristics

This chapter provides requirements for the electrical characteristics of the rigid PVC conduit system, including the、、、、、、、.

* Chapter 5: Fire Safety

This chapter provides requirements for the fire safety of the rigid PVC conduit system, including、、.

4. Conclusion

UL 651-A is a technical specification that consolidates and replaces all previous versions of the UL 651 standard, providing a more streamlined and up-to-date set of requirements for the design and construction of rigid PVC conduit systems. It is essential for ensuring the safety, reliability, and suitability of these systems, which are commonly used in the electrical industry for various applications.