IEC 60502-1:2021

Overview

IEC 60502-1:2021 specifies the construction, dimensions and test requirements for power cables with extruded solid insulation for rated AC voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV). It covers cables intended for fixed installations such as distribution networks and industrial installations, and includes provisions for materials (insulation and sheaths), conductor types, metallic layers and mechanical protections. The standard also allows, when declared by the manufacturer, the use of cables designed to this standard in certain DC distribution systems (limits defined in the standard).

Key Topics and Requirements

• Scope and applicability: Cables for 1 kV and 3 kV rated AC voltages; optional use in DC systems (e.g., ≤ 750 V DC nominal to earth, ≤ 1 500 V DC nominal live-to-live, subject to manufacturer declaration).
• Construction and dimensions: Requirements for conductors, extruded insulation (e.g., XLPE, EPR/HEPR options), inner coverings, metallic screens, concentric conductors, sheaths and armour.
• Material specifications: Insulating and sheathing compound types, conductor temperature ratings and permitted sheathing materials; includes provisions for halogen-free and low-smoke materials.
• Testing regime: Defined routine tests, sample tests, and type tests - both electrical (high-voltage, dielectric) and non-electrical (mechanical properties, ageing, flammability and halogen-free verification).
• Fire and safety characteristics: Requirements for reduced flame spread, low smoke emission and halogen-free emissions when exposed to fire.
• Installation and post-installation testing: Electrical tests after installation are addressed to ensure in-service safety and conformity.

Applications and Users

Practical uses:

• Medium-voltage distribution in urban/industrial power networks
• Fixed wiring for factories, substations and building distribution systems
• Cable specifications for projects requiring halogen-free or low-smoke behavior

Who uses it:

• Cable manufacturers and material suppliers (product design and type testing)
• Electrical engineers and specifiers (design, procurement and compliance)
• Test laboratories and certification bodies (routine, sample and type testing)
• Utilities, EPC contractors and maintenance teams (selection, installation and acceptance testing)

Related Standards

• IEC 60811 - Cable test methods (referenced for detailed mechanical and material tests)
• IEC 60445 - Core identification and colour recommendations (noted for DC systems)
• IEC 62930 - Cables for photovoltaic systems (covers PV-specific cables excluded from this part)
• IEC 60060-1 / IEC 60038 - High-voltage test techniques and standard voltages (normative references)

IEC 60502-1:2021 is the authoritative reference for specifying and verifying medium-voltage, extruded-insulation power cables (1 kV and 3 kV) used in fixed installations, emphasizing material performance, safety and comprehensive electrical and mechanical testing.