Wiring Methods & MaterialsPregunta 61 de 120
What is the minimum trade size of EMT required for nine 12 AWG THHN conductors?
a.One-half inch
b.Three-quarter inch
c.One inch
d.One and one-quarter inch
Explicación
Annex C, Table C1 shows that one-half inch EMT accepts nine 12 AWG THHN conductors, exactly meeting the requirement. Three-quarter inch EMT holds sixteen and one inch holds twenty-six, so both are larger than the minimum. Annex C may be used directly whenever all conductors are the same size and insulation type.
Referencia Legal: 2023 NEC Annex C, Table C1Practica las 120 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- A box contains six 12 AWG conductors, one internal cable clamp and one duplex receptacle, all 12 AWG. What minimum box volume is required?
- A device box has three 14-2 NM cables with equipment grounding conductors entering through internal clamps, and one single-pole switch is installed. What minimum box volume is required?
- When more than two conductors are installed in a raceway, what is the maximum permitted percentage of the raceway cross-sectional area they may occupy?
- A short raceway nipple no longer than 24 inches connects two enclosures. What fill percentage is permitted?
- Four 3/0 AWG THWN conductors, each 0.2679 square inch in area, are pulled into rigid metal conduit. What is the minimum trade size?
- What is the minimum cover for a direct-buried UF cable installed in a residential yard on a 120-volt, 20-ampere circuit that is NOT GFCI protected?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Journeyman Electrician Licensing Exam (NEC-based) · Cómo revisamos