Journeyman Electrician Practice Exam

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Get ready for the Journeyman Electrician Exam. Study with flashcards, multiple-choice questions, and detailed explanations. Prepare effectively and ensure success on your certification!

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What is the ampacity of a size 8 AWG single copper conductor with Type FEPB insulation, installed in free air?

60 amperes
70 amperes
80 amperes
90 amperes

The correct answer is: 80 amperes

The ampacity of a size 8 AWG single copper conductor is determined by various factors, including the conductor's size, material, insulation type, and its installation conditions. For a size 8 AWG copper conductor with Type FEPB insulation, installed in free air, the ampacity can be referenced from the National Electrical Code (NEC) tables. When copper conductors are installed in free air, they can usually carry more current compared to those installed in conduit or other configurations. Specifically, Type FEPB insulation is rated to handle higher temperatures, which allows the conductor to safely carry an increased load. According to NEC guidelines, a size 8 AWG copper conductor with the specified insulation type, under free air conditions, can typically carry 80 amperes. However, depending on the referencing guide or regional amendments, it may be calculated or rounded to 90 amperes in specific scenarios, but the most common referenced value for practical purposes remains around 80 amperes. Thus, understanding the insulation type and installation method, along with the proper source references, contributes to determining the correct ampacity value for this conductor setup.