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AutoQuiz: Standard NFPA Wire Colors

The post AutoQuiz: Standard NFPA Wire Colors first appeared on the ISA Interchange blog site.

AutoQuiz is edited by Joel Don, ISA’s social media community manager.

Today’s automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional’s skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for information about the CAP program. The following question comes from the CAP study guide, Performance Domain III, System Design: Design, specify, and procure the hardware/software used in the system.


According to the NFPA 79, the standard wire colors for line voltage, AC control currents, DC control circuits, and interlock circuits are respectively shown as:

a) black, red, blue, yellow
b) black, red, orange, yellow
c) brown, red, orange, yellow
d) brown, black, white, red
e) none of the above


<span class="collapseomatic " id="id7065" tabindex="0" title="Click Here to Reveal the Answer” >Click Here to Reveal the Answer

Black, red, blue, yellow is the correct answer per NFPA-79: The Electrical Standard for Industrial Machinery, which is in correspondence with article 670 in the National Electrical Code (NEC). This is located in section 14.2: Identification of Conduction.

NFPA is the National Fire Protection Association (established 1896) an independent, voluntary-membership, non-profit (tax-exempt) organization.

Incorporated in 1930 in Massachusetts, NFPA’s mission is to reduce the worldwide burden of fire and other hazards on the quality of life by providing and advocating scientifically-based consensus codes and standards, research, training, and education.

NFPA’s international headquarters is in Quincy, Mass.

The correct answer is A, black, red, blue, and yellow.

Reference: NFPA-79; Electrical Standard for Industrial Machinery, NFPA, 2002

Source: ISA News