What is the maximum ampacity of #12 THWN conductors?

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Prepare for the CWEA Electrical/Instrumentation (E/I) Grade 1 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

What is the maximum ampacity of #12 THWN conductors?

Explanation:
Ampacity depends on conductor size and the insulation’s temperature rating. For copper, the ampacity values for #12 vary by temperature rating: 60°C column gives 20 A, 75°C column gives 25 A, and 90°C column gives 30 A. THWN insulation is rated for 75°C (THWN), so you use the 75°C column. Therefore, the maximum ampacity for #12 THWN is 25 A.

Ampacity depends on conductor size and the insulation’s temperature rating. For copper, the ampacity values for #12 vary by temperature rating: 60°C column gives 20 A, 75°C column gives 25 A, and 90°C column gives 30 A. THWN insulation is rated for 75°C (THWN), so you use the 75°C column. Therefore, the maximum ampacity for #12 THWN is 25 A.

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