ISO 6722

Defines dimensions, test methods, and requirements for single-core cables intended for use in road vehicle applications where the nominal system voltage does not exceed 60 V DC or 25 V AC.

Wall Thickness Classes

ISO 6722 categorizes wire by insulation thickness. Modern vehicles push towards ultra-thin walls to save weight and space.

Thick Wall (Type 1): Older legacy vehicles. High abrasion resistance, very heavy.
Thin Wall (Type 2): Typical modern automotive wire (e.g., FLRY-B).
Ultra-Thin Wall (Type 3): Emerging in high-density EV architectures. Requires highly controlled routing to prevent chafe.

Temperature Classes

Wires are rated from Class A (-40 to 85°C) up to Class H (-40 to 175°C). Selecting a Class A wire for an engine bay harness will result in catastrophic failure.

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