IEC 60502 Cable

1. Structure and Voltage Levels

The IEC 60502 standard is primarily divided into two parts based on voltage, clearly defining their scope of application:

• IEC 60502-1 (Low Voltage Range): Applicable to cables with rated voltages of 1 kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV) . This part covers common low-voltage distribution cables and includes requirements for cables with special characteristics such as flame retardance, low smoke emission, and halogen-free materials.
• IEC 60502-2 (Medium Voltage Range): Applicable to cables with rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV) . This part focuses on medium voltage networks, imposing stricter requirements on insulation thickness, screening layers, and water-blocking constructions.

2.Key Technical Content and Scope

The standard defines the construction and dimensions of conductors, insulation, metallic screens, and non-metallic sheaths, as well as specifies requirements for routine tests, sample tests, and type tests.

Application Scope:

• Application scenarios: Fixed installations in distribution networks, industrial plants, or similar facilities.
• Insulation materials: Primarily thermosetting materials (e.g., cross-linked polyethylene – XLPE) and thermoplastic materials (e.g., PVC) – i.e., solid extruded insulation types.

Special Considerations:

• Water resistance (key for MV): IEC 60502-2 gives particular attention to the risk of radial and longitudinal water ingress. It includes requirements for the design and testing of barriers that prevent longitudinal water propagation.
• DC applications: In the 1 kV part, the standard explicitly allows such cables to be used in specific DC power distribution systems (e.g., ≤750 V to earth or ≤1500 V between poles) if declared by the manufacturer.
• Exclusions: The standard does not apply to special installations such as overhead lines, mining, nuclear power plant containment areas, submarine, or shipboard cables.

3.Latest Revisions and Updates

IEC 60502 is regularly updated to reflect technological progress. As of 2024–2025, the most recent developments focus on the update to IEC 60502-2:

• Latest version: IEC 60502-2:2014+AMD1:2024 CSV (published in May 2024).
• Key technical changes: This significant revision introduces several important updates, including:
  1. Simplified calculation procedures for lead sheath and outer sheath thickness.
  2. Revised requirements for non-metallic sheaths (including semi-conducting layers) .
  3. Added an option for post-installation 0.1 Hz Very Low Frequency (VLF) testing, facilitating on-site withstand voltage tests.
  4. Added routine electrical tests for outer sheaths.
  5. Introduced a new subclause for determining cable conductor temperature.

4. Significance of the Standard

IEC 60502 is a foundational standard for both the cable manufacturing industry and the power engineering sector. It ensures that cables from different manufacturers exhibit consistent performance and safety when connected and operated. For engineers and purchasers, compliance with this standard means the cable can withstand the specified voltage levels, environmental stresses (such as water ingress), and fire safety conditions (e.g., flame retardance), thereby ensuring the reliable operation of the power system.

Summary

IEC 60502 provides a comprehensive technical specification for extruded insulation power cables rated from 1 kV to 30 kV, widely used in medium and low voltage power distribution. With the 2024 amendment, the standard further strengthens requirements for water resistance, testing methodologies, and long-term operational reliability of power cables.

Comprehensive List of Cable Types and Size Ranges under IEC 60502

IEC 60502 does not prescribe a fixed list of mandatory cable types. Instead, it defines the construction, materials, and test requirements for extruded insulation power cables. Manufacturers design cables that comply with these requirements, resulting in various recognized cable types.

Below is a comprehensive list of common cable types manufactured in accordance with IEC 60502-1 (1 kV and 3 kV) and IEC 60502-2 (6 kV to 30 kV), along with their typical size ranges.

Part 1: Low Voltage Cables (IEC 60502-1)

Rated Voltage: 0.6/1 (1.2) kV (suitable for 1 kV and 3 kV AC systems, as well as DC systems up to 1.5 kV)

1. Unarmoured Cables (NYY / NAYY / Cu/PVC/PVC)

Description	Conductor Material	Core Count Range	Size Range (Cross-section)
PVC insulated, PVC sheathed, unarmoured power cable	Copper (Cu) or Aluminum (Al)	1 to 5 cores (or multi-core)	1.5 mm² to 1000 mm²

Typical Applications: Fixed installation in dry or damp premises, cable ducts, and conduit systems.

2. Steel Wire Armoured (SWA) Cables (Cu/XLPE/SWA/PVC)

Description	Conductor Material	Core Count Range	Size Range (Cross-section)
XLPE insulated, steel wire armoured, PVC sheathed cable	Copper (Cu) – Stranded Class 2 or Aluminum (Al)	1 to 5 cores	1.5 mm² to 630 mm²
PVC insulated, SWA, PVC sheathed cable (CVV-SWA)	Copper (Cu) or Aluminum (Al)	2 to 61 cores (control/multi-core)	0.5 mm² to 6 mm²

Typical Applications: Direct burial, outdoor installation, mechanical protection, submersible pumps.

3. Steel Tape Armoured (STA) Cables (Cu/XLPE/STA/PVC)

Description	Conductor Material	Core Count Range	Size Range (Cross-section)
XLPE insulated, double steel tape armoured, PVC sheathed cable	Copper (Cu) or Aluminum (Al)	4 cores	4 mm² to 400 mm²

Typical Applications: Direct burial where galvanized wire armouring is not required.

4. Flexible / Submersible Cables

Description	Conductor Material	Core Count Range	Size Range (Cross-section)
PVC insulated, PVC sheathed submersible cable (Class 5 flexible conductor)	Copper (Cu) – Class 5 (fine stranded)	3 to 4 cores	1.0 mm² to 4.0 mm²

Typical Applications: Submersible pumps, wet locations, moving parts.

Part 2: Medium Voltage Cables (IEC 60502-2)

Rated Voltage Range: 6 kV (Um = 7.2 kV) to 30 kV (Um = 36 kV) 

1. Single Core MV Cables (Unarmoured or Armoured)

Description	Conductor Material	Core Count	Voltage Levels	Size Range (Cross-section)
XLPE insulated, copper tape/wire screened, PVC/PE sheathed	Copper (Cu) or Aluminum (Al)	1	3.6/6(7.2)kV, 6/10 (12) kV, 8.7/15(17.5)kV 12/20 (24) kV, 18/30 (36) kV	25 mm² to 800 mm²
XLPE insulated, aluminum/steel wire armoured, PVC sheathed	Copper (Cu) or Aluminum (Al)	1	3.6/6(7.2)kV, 6/10 (12) kV, 8.7/15(17.5)kV 12/20 (24) kV, 18/30 (36) kV	25 mm² to 630 mm²

2. Three Core MV Cables (Armoured)

Description	Conductor Material	Core Count	Voltage Levels	Size Range (Cross-section)
XLPE insulated, copper tape screened, galvanized steel wire armoured, PVC/PE sheathed	Copper (Cu) or Aluminum (Al)	3	3.6/6(7.2)kV, 6/10 (12) kV, 8.7/15(17.5)kV 12/20 (24) kV, 18/30 (36) kV	25 mm² to 400 mm²
XLPE insulated, lead sheath (water barrier), PVC/PE sheathed	Copper (Cu) or Aluminum (Al)	3	3.6/6(7.2)kV, 6/10 (12) kV, 8.7/15(17.5)kV 12/20 (24) kV, 18/30 (36) kV	35 mm² to 500 mm²

Typical Applications: Primary distribution networks, industrial power supply, substation feeders.

Summary Table: Core Count vs. Cross-section Range

Cable Type	Core Count	Cross-section Range (mm²)	Standard Part
Unarmoured (PVC/PVC)	1	1.5 – 1000	IEC 60502-1
Unarmoured (PVC/PVC)	2, 3, 4, 5	1.5 – 400	IEC 60502-1
SWA (XLPE/SWA/PVC)	1	25 – 630	IEC 60502-1
SWA (XLPE/SWA/PVC)	2, 3, 4	1.5 – 300	IEC 60502-1
SWA (PVC/SWA/PVC) – Control	2 – 61	0.5 – 6	IEC 60502-1
STA (XLPE/STA/PVC)	4	4 – 400	IEC 60502-1
Submersible (Flexible)	3, 4	1.0 – 4.0	IEC 60502-1
MV Single Core (6-30 kV)	1	25 – 800	IEC 60502-2
MV Three Core (6-30 kV)	3	25 – 500	IEC 60502-2