Electrician's Licensing Practice Exam

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Prepare for the Electrician's Licensing Test with comprehensive multiple choice questions and hints. Improve your knowledge, skills, and confidence to excel in your exam!

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When using aluminum wire with receptacles, what must it be marked as?

ALUM
CO/AL
CO/ALR
ALR ONLY

The correct answer is: CO/ALR

The marking that indicates aluminum wire used with receptacles must be designated as "CO/ALR." This designation stands for Copper-Aluminum alloy and signifies that the wire is specifically designed for use with aluminum wiring and has special coatings or treatment to reduce the risk of fire and improve connection reliability. Using "CO/ALR" helps electricians and others recognize that the wire is safe for connections with devices that may otherwise not be compatible, ensuring proper installation and reducing the likelihood of oxidation or other issues that could compromise electrical safety. In contrast, the other choices do not carry the specific implication of safety and suitability for connections with aluminum wiring. "ALUM" simply indicates general aluminum, while "CO/AL" suggests compatibility without the enhanced measures of the "R" designation. "ALR ONLY" lacks the context of proper connection standards and does not reflect an accurate marking for electrical safety requirements.