ISO 6722-1 Road Vehicles - 60 V and 600 V Single-Core Cables - Part 1 Copper Conductor Cables

ISO 6722-1 Road Vehicles - 60 V and 600 V Single-Core Cables - Part 1: Copper Conductor Cables

The ISO 6722-1 Road vehicles - 60 V and 600 V single-core cables - Part 1: Dimensions, test methods and requirements for copper conductor cables, published by the International Organization for Standardization (ISO), describes the dimensions, test methods and requirements for single-core 60-volt cables designed for use in road vehicle applications where the nominal system voltage is a maximum of 60 Volts direct current or 25 Volts alternating current. This standard also includes additional test methods or requirements for 600-volt cables designed for use in road vehicle applications where the nominal system voltage is between a minimum of 60 Volts direct current or 25 Volts alternating current and a maximum of 600 Volts direct current or 600 Volts alternating current. This standard also applies to individual cores in multi-core cables.

The ISO 6722-1 standard contains the requirements for copper conductor cables.

This standard is an internationally accepted standard for electrical wiring used in road vehicles. It specifies dimensions, performance requirements, and test methods for single-core copper conductor cables operating at 60 Volts and 600 Volts, ensuring their reliability under the harsh environmental conditions encountered in automotive applications.

The ISO 6722-1 standard applies to the following:

• Single-core copper conductor cables used in passenger cars, trucks, buses, motorcycles, and SUVs.
• Single cores used in multi-core automotive cables.
• Electrical systems that operate at these voltages:
  • For conventional vehicle electrical systems, up to 60 Volts DC or 25 Volts AC.
  • Up to 600 Volts DC or AC for hybrid and electric vehicle applications.

This standard covers the cable itself, not complete cable harness assemblies or connectors.

The main objectives of the ISO 6722-1 standard are as follows:

• Standardizing automotive cable sizes.
• To define electrical and mechanical performance requirements.
• To ensure consistent product quality worldwide.
• Improving vehicle electrical safety.
• To enhance long-term reliability in demanding automotive environments.
• To facilitate compatibility between vehicle manufacturers and cable suppliers.

The ISO 6722-1 standard specifies requirements for various critical characteristics. The basic requirements are defined in this standard as follows:

• Conductor requirements: This standard defines the following:
  • Copper conductor structure
  • Cross-sectional area
  • Wire configuration
  • Electrical resistance limits
  • conductor flexibility

These requirements ensure low electrical losses while maintaining mechanical durability.

• Insulation requirements: Cable insulation must provide the following:
  • Sufficient dielectric strength
  • Suitable insulation thickness
  • Proper structure
  • Resistance to cracking.
  • Protection against moisture and chemicals.

Various insulation materials can be used, provided they meet the specified performance criteria.

Automotive cables operate under extremely diverse environmental conditions. The ISO 6722-1 standard classifies cables according to their continuous operating temperature capacity, allowing manufacturers to select suitable cables for the following types of applications:

• Passenger compartments
• Engine compartments
• Battery systems
• Hybrid and electric vehicle power circuits

Higher temperature ratings are required near engines, exhaust systems, and electrical drive components.

The ISO 6722-1 standard includes comprehensive laboratory tests to verify cable performance. Typical test methods include:

• Dimensional control: This test verifies the following:
  • Conductor diameter
  • Insulation thickness
  • Total cable diameter
• Electrical resistance test: This test measures the resistance of a conductor to ensure efficient current transmission.
• Voltage withstand test: This test verifies the integrity of the insulation under high electrical voltage.
• Insulation resistance test: This test measures the leakage current flowing through the insulation.
• Heat aging test: This test evaluates cable performance after prolonged exposure to high temperatures.
• Low-temperature flexibility: This test determines whether the cables remain flexible without cracking in cold climates.
• Abrasion resistance: This test evaluates the insulation's ability to withstand friction against vehicle components.
• Mechanical strength tests: These tests include the evaluation of the following:
  • Tensile strength
  • Elongation
  • Flexibility
  • Bending performance
• Chemical resistance: This test examines the cable's resistance to the following substances:
  • Engine oil
  • Brake fluid
  • Fuel
  • coolant
  • Cleaning chemicals
• Flame resistance: This test confirms that the cable does not spread excessive flames and contributes to vehicle fire safety.

Cables conforming to the ISO 6722-1 standard are commonly used in the following areas:

• Engine wiring harnesses
• Battery cables
• Lighting circuits
• Power distribution systems
• Electronic control units (ECU)
• Sensor wiring
• Information and entertainment systems
• ABS systems
• Airbag wiring
• Electric power steering
• Hybrid vehicle systems
• Electric vehicle high-voltage auxiliary circuits

Using cables that conform to the ISO 6722-1 standard offers several advantages:

• Improved electrical safety.
• Reliable long-term performance
• Standardized product quality.
• Better resistance to heat and vibration.
• Reduced risk of insulation failure.
• Greater alignment among global automotive suppliers.
• Enhanced durability in demanding work environments.

The ISO 6722-1 standard is widely adopted by the following sectors:

• Original equipment manufacturers
• Electric vehicle manufacturers
• Commercial vehicle manufacturers
• Automotive wiring harness suppliers
• Cable manufacturers
• Automotive electronics companies
• Testing laboratories
• Certification bodies

The ISO 6722-1 standard is often used in conjunction with other automotive standards that regulate the following topics:

• Cable harness systems
• Connector systems
• Environmental tests
• Vehicle electrical safety
• Electromagnetic compatibility (EMC)
• High voltage electric vehicle requirements

Together, these standards help ensure the safety and reliability of modern vehicle electrical systems.

Modern vehicles contain thousands of electrical connections that must function reliably for many years despite exposure to heat, vibration, humidity, chemicals, and mechanical stress. The ISO 6722-1 standard defines uniform design, material, and testing requirements for automotive wiring, reducing the risk of electrical failures that could affect critical systems such as lighting, braking, engine management, and high-voltage power distribution.

In conclusion, the ISO 6722-1 standard is one of the most important international standards for automotive electrical wiring, helping manufacturers produce safe, durable, and reliable electrical systems by defining standardized dimensions, rigorous testing methods, and minimum performance requirements for copper conductor cables used in both conventional and electric vehicles.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the ISO 6722-1 standard.