J2221_201905 Standardized Symbols for Electrical Circuit Diagrams

Industry adoption of this symbol convention will aid in the understanding of electrical circuits by engineers, OEM suppliers, service technicians and the industry generally. Standardization will mitigate misinterpretation within the industry.

This surface vehicle standard applies to medium and heavy-duty commercial vehicles.

The benefits of standardization are:

• The symbols can be used universally.
• Communication of electrical information is enhanced.
• The symbols are supported by text annotations for identification and operating notes.
• The symbols can display clearly on electronic display monitors and can be printed legibly.