IEC 61238-1-3:2018

Overview

IEC 61238-1-3:2018 specifies type test methods and requirements for compression and mechanical connectors used on power cables with rated voltages above 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV). The standard applies to connectors tested on non‑insulated conductors and covers copper conductors (nominal cross-sections 2.5 mm² to 1200 mm²) and aluminium conductors (16 mm² to 1200 mm²), with a maximum continuous conductor temperature of 90 °C. It excludes connectors for overhead line conductors and connectors with sliding contacts. IEC 61238-1-3:2018 is the first edition and, together with IEC 61238-1-1 and -1-2, cancels IEC 61238-1:2003.

Keywords: IEC 61238-1-3, compression connectors, mechanical connectors, power cables, test methods, 1 kV to 30 kV, non-insulated conductors.

Key Topics and Requirements

• Scope and conductor limits: Defines applicable conductor materials and cross-sectional ranges based on IEC 60228.
• Test philosophy: Reference tests are performed on unused conductors; clear installation and measurement procedures are specified.
• Electrical tests:
  • Resistance and temperature measurements to assess connection integrity.
  • Heat cycling tests (multiple cycles) to verify thermal stability under rated/current-induced heating.
  • Short‑circuit tests with updated calculation methods and requirements to evaluate connector behavior under fault conditions.
  • Limits on elevated heating current to avoid unrealistic current densities that could damage connector materials during testing.
  • Introduction of an electrical test for cable terminal lugs used in separable connectors.
• Mechanical tests:
  • Defined mechanical classes, including a new class for connectors subject to higher mechanical loads.
  • Tensile load and endurance verification methods and reporting requirements.
• Assessment and reporting: Procedures for calculating resistance factors, assessing test results, and preparing a comprehensive test report are provided.
• Normative and informative annexes: Include calculation methods (adiabatic short-circuit current), measurement recommendations, and guidance on test-loop configuration and evaluation.

Practical Applications

• Ensures connector safety, electrical continuity, thermal performance, and mechanical strength for medium‑voltage cable systems.
• Used to develop and type‑approve compression and mechanical connectors for buried cables, building installations, and other cable networks (non‑overhead).
• Supports procurement specifications, quality control, product development, and conformity assessment in utilities, OEMs, and cable accessory manufacturers.

Who Should Use This Standard

• Cable accessory manufacturers and designers
• Independent test laboratories and certification bodies
• Power utilities and grid engineers specifying connector performance
• Procurement/specification writers and installation contractors
• Consultants and standards committees involved in medium‑voltage cable systems

Related Standards

• IEC 60228 (conductors - nominal cross-sectional areas and conductor classification)
• IEC 61238-1-1 and IEC 61238-1-2 (related parts of the IEC 61238 series)
• IEC 61238-1:2003 (superseded)

For product compliance and safety, always confirm you have the latest edition and applicable national adaptations before specifying or testing connectors.