Wiring Methods & MaterialsPregunta 65 de 120
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?
a.18 inches
b.24 inches
c.12 inches
d.6 inches
Explicación
Direct-buried cables and conductors under all locations not otherwise covered require 24 inches of cover. The 12-inch reduction applies only to residential branch circuits rated 120 volts or less, 20 amperes or less, and provided with GFCI protection, so removing the GFCI removes the reduction. The 6-inch and 18-inch values belong to metal and nonmetallic raceways respectively.
Referencia Legal: 2023 NEC Table 300.5Practica las 120 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- 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 burial cover for rigid metal conduit installed underground in a location not otherwise specified?
- What is the minimum burial cover for a nonmetallic raceway listed for direct burial without concrete encasement, installed under a lawn?
- A GFCI-protected 120-volt, 20-ampere residential branch circuit is direct buried in a yard. What is the minimum cover?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Journeyman Electrician Licensing Exam (NEC-based) · Cómo revisamos