Wiring Methods & MaterialsQuestion 66 of 120
What is the minimum burial cover for rigid metal conduit installed underground in a location not otherwise specified?
a.18 inches
b.12 inches
c.6 inches
d.24 inches
Explanation
Rigid metal conduit and intermediate metal conduit are permitted at 6 inches of cover because the metal wall provides its own physical protection. Nonmetallic raceways listed for direct burial require 18 inches, direct-buried cable requires 24 inches, and 12 inches applies to GFCI-protected residential branch circuits.
Law Reference: 2023 NEC Table 300.5Practice all 120 questions free — no signup required.
Related questions on this topic
- 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?
- 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?
- How must electrical metallic tubing be secured and supported on a normal horizontal run?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Journeyman Electrician Licensing Exam (NEC-based) · How we review