ISO 20076:2019

Overview

ISO 20076:2019 specifies test methods and general performance requirements for voltage class B connectors used in road-vehicle electrical wiring harnesses. It covers single‑pole and multi‑pole connectors intended for electric propulsion systems and conductively connected auxiliary electric systems of electrically propelled road vehicles. The standard applies to connectors designed to be disconnected only after mounting in the vehicle (for repair/maintenance), for cable conductor sizes from 1.5 mm² to 120 mm², and explicitly excludes vehicle charging inlets and internal electronic device connections.

Key topics and technical requirements

ISO 20076:2019 organizes testing and requirements across mechanical, electrical and environmental performance. Major topics include:

• Terms and definitions specific to voltage class B connectors to ensure consistent interpretation.
• Preconditioning and durability: environmental and mechanical preconditioning before performance tests.
• Mechanical tests: visual examination; connection/disconnection cycles; tensile strength of terminal-to-cable and shield connections; locking device strength; forces for unintentional lever release and lock-button actuation; CPA (connector position assurance) and TPA (terminal position assurance) locking and disengagement/extraction tests.
• Insertion/extraction forces: terminal insertion force, insertion with incorrect orientation, and terminal extraction force.
• Functional checks: connector engagement sound and connector coding/polarization effectiveness to prevent misconnection.
• Electrical performance: connection resistance (voltage drop), temperature rise under load, insulation resistance, and withstanding voltage tests.
• EMC and protection: electromagnetic shielding performance and water tightness tests.
• Test sequencing and sample quantities: defined conditions for reproducibility and consistency in type testing.

(The standard defines tests and pass/fail requirements; numerical thresholds and detailed procedures are contained in the full ISO document.)

Practical applications - who uses ISO 20076:2019

ISO 20076:2019 is used by:

• Automotive OEMs and Tier‑1 wiring harness and connector suppliers for product design, validation and supplier specifications.
• Test laboratories and certification bodies conducting compliance testing and type approval.
• Design and safety engineers to verify mechanical reliability, electrical safety and environmental robustness of high‑voltage connectors in electric and hybrid vehicles.
• Procurement and quality teams to set acceptance criteria and supplier conformity checks.

Adoption helps ensure connector safety, interchangeability, maintainability and compliance with industry best practices for high‑voltage vehicle systems.

Related standards

ISO 20076:2019 complements other automotive and electrical connector standards covering high‑voltage system design, charging interfaces and internal electronic connections. For full technical implementation, consult ISO 20076:2019 alongside other relevant ISO and regional vehicle electrification standards.