IEC 61439 – 1 & IEC 61439 – 2

IEC 61439-1 and IEC 61439-2 are international standards published by the International Electrotechnical Commission (IEC) that relate to the performance and testing of low-voltage switchgear and controlgear assemblies. These standards provide guidelines for the design, construction, testing, and performance of such assemblies.

IEC 61439-1: Low-voltage switchgear and controlgear assemblies – Part 1: General rules

Scope:

IEC 61439-1 outlines the general rules and requirements applicable to low-voltage switchgear and controlgear assemblies. It provides a framework for the standardization of these assemblies and covers aspects such as definitions, service conditions, and methods for verification of performance.

Key Points:

Definitions and Terminology:

The standard establishes common definitions and terminology to ensure clarity and consistency in the understanding of low-voltage switchgear and controlgear assemblies.

Service Conditions:

IEC 61439-1 defines various service conditions, including temperature, humidity, and other environmental factors, that need to be taken into account during the design and testing of assemblies.

Verification of Performance:

The standard specifies methods for verifying the performance of low-voltage switchgear and controlgear assemblies, including testing procedures and criteria for compliance.

Design and Construction Requirements:

IEC 61439-1 outlines the general design and construction requirements for assemblies, including aspects related to electrical and mechanical properties, as well as safety considerations.

IEC 61439-2: Low-voltage switchgear and controlgear assemblies – Part 2: Power switchgear and controlgear assemblies

Scope:

IEC 61439-2 specifically focuses on power switchgear and controlgear assemblies within the broader category of low-voltage switchgear and controlgear assemblies.

Key Points:

Applicability to Power Assemblies:

IEC 61439-2 provides detailed requirements and specifications applicable to power switchgear and controlgear assemblies, addressing their unique characteristics and functionalities.

Design Verification:

The standard covers the verification of the design of power assemblies, ensuring that they meet the necessary electrical and mechanical requirements.

Testing Procedures:

IEC 61439-2 outlines specific testing procedures for power switchgear and controlgear assemblies, including type testing and routine testing, to verify their performance under various conditions.

Temperature Rise Limits:

The standard establishes temperature rise limits for power assemblies to ensure that their components operate within safe temperature ranges during normal operation.

Short-Circuit Withstand Strength:

Requirements for the short-circuit withstand strength of power assemblies are defined to ensure their resilience under fault conditions.
These standards are important in the field of electrical engineering as they provide a framework for ensuring the safety, reliability, and performance of low-voltage switchgear and controlgear assemblies. Engineers, manufacturers, and regulatory bodies often refer to these standards to establish compliance and best practices in the design and testing of electrical assemblies.