Approved wiring methods, conductor types, and installation rules under the NEC tested on licensing exams.
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- What does NM cable stand for?
- Nonmetallic sheathed cable
- Minimum burial depth for outdoor NM cable?
- 12 inches
- Where is UF cable approved for use?
- Underground and direct burial in earth
- What does THHN insulation stand for?
- Thermoplastic High Heat-resistant Nylon-jacketed
- EMT means what in electrical work?
- Electrical Metallic Tubing
- Maximum conduit fill percentage for three or more conductors?
- 40 percent
- Total degrees of bends allowed between conduit pull points?
- 360 degrees
- Standard ambient temperature used in ampacity tables?
- 86 degrees F (30 degrees C)
- What color must neutral conductors be?
- White or gray
- What colors indicate hot conductors in single-phase 120/240V?
- Black and red
- Color for grounding and equipment ground conductors?
- Bare copper or green
- Maximum support spacing for horizontal cable runs?
- 4.5 feet
- How often must rigid metal conduit be supported?
- Every 10 feet
- Maximum safe ambient temperature for PVC conduit?
- 50 degrees C (122 degrees F)
- Minimum burial depth for UF cable in normal soil?
- 24 inches
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