IEC 61238-1-2:2018

Overview

IEC 61238-1-2:2018 is an international standard that specifies test methods and requirements for insulation piercing connectors (IPCs) used in power cables for rated voltages up to 1 kV (Um = 1.2 kV). Developed by the International Electrotechnical Commission (IEC), this standard is vital for ensuring the reliability and safety of connectors intended for low-voltage cable systems, particularly those with copper or aluminium conductors installed in buildings or underground.

The standard defines comprehensive electrical and mechanical test procedures to verify that IPCs consistently perform under a variety of service conditions. It applies to connectors for conductors in accordance with IEC 60228, covering cross-sectional areas from 2.5 mm² to 300 mm² for copper and from 16 mm² to 500 mm² for aluminium. It does not apply to connectors used for overhead lines or with sliding contacts.

Key Topics

IEC 61238-1-2:2018 covers the following essential areas:

• Scope and Applicability: Focus on connectors for insulated conductors within low-voltage installations.
• Definition of Connector and Cable Classes: Distinction between applications requiring high mechanical strength and those with minimal mechanical stress.
• Testing Procedures: Outlines type test methods for electrical performance (including heat cycling, short-circuit resistance, and electrical resistance) and mechanical integrity.
• Mechanical Class Introduction: Incorporates a new class to address connectors exposed to negligible mechanical force.
• Short-circuit and Heat Cycling Tests: Updated methods to assess connector performance under simulated fault and operational conditions.
• Testing Multicore Connectors: Introduction of procedures and recommendations for IPCs used with multicore cables.
• Pre-conditioning via Live Load Pickup: Addition of a procedure to simulate in-service connector performance under live load conditions.
• Documentation and Reporting: Specifies the required data to be included in test and approval reports.

Applications

Adhering to IEC 61238-1-2:2018 offers practical value across several areas:

• Power Distribution Networks: Ensures IPCs in power distribution cabinets and underground networks perform reliably under various load and temperature cycles.
• Building Installations: Promotes safety and stability for cable connections within commercial and residential buildings, where cables are commonly insulated and hidden from view.
• Quality Assurance and Product Certification: Serves as a benchmark for manufacturers aiming to comply with international quality and reliability criteria, aiding in global market acceptance.
• Cable System Maintenance & Upgrades: Provides utilities and contractors with standardized requirements for replacement or upgrade connectors, supporting long-term reliability.
• Regulatory Compliance: Helps organizations comply with installation codes referencing IEC standards for cable accessories and connectors.

Related Standards

• IEC 60502-1: Power cables with extruded insulation and their accessories for rated voltages from 1 kV up to 30 kV.
• IEC 60228: Conductors of insulated cables.
• IEC 61238-1-1: Test methods and requirements for compression and mechanical connectors for power cables tested on non-insulated conductors.
• IEC 61238-1-3: Test methods and requirements for connectors for power cables for higher rated voltages (above 1 kV up to 30 kV).
• IEC 60050-461: International Electrotechnical Vocabulary - Electric cables.

Conclusion

IEC 61238-1-2:2018 plays a critical role in modern power cable system design, installation, and maintenance. By defining robust testing methods for insulation piercing connectors, the standard contributes to the safety, performance, and durability of low-voltage power distribution systems. Compliance supports international acceptance and high operational reliability for power infrastructure solutions.