If laid in notches in wood studs, joists, rafters, or other wood members, ___ shall be protected against nails or screws by a steel plate at least 1/16" thick.

• A. flexible conduit
• B. EMT
• C. rigid nonmetallic conduit
• D. intermediate metal conduit

Answer: (A)

When a conductor or raceway runs through notches in wood framing, it must be shielded from nails or screws to prevent damage to the insulation or jacket. A steel plate of at least 1/16 inch thick is used as that shield, covering the notch so that nails cannot pierce the electrical path.

Flexible conduit is especially vulnerable in these notches because its walls are thinner and less rigid than those of rigid metal conduits. That vulnerability is why the plate protection is specified for this type of raceway in wood framing scenarios. The plate acts as a durable barrier, transferring any nail’s impact to the plate instead of the conduit, and helps keep the installation compliant and safe.

Rigid metal conduits and rigid nonmetallic conduits are more resistant to puncture and damage in such locations, so the emphasis in this protection requirement tends to center on flexible conduit, which is more easily damaged by nails when placed in notches.