Which practice is prohibited when mounting electrical equipment in masonry?

Which practice is prohibited when mounting electrical equipment in masonry?

• A. Damp or wet locations
• B. Wooden plugs in masonry
• C. Natural circulation of air
• D. Gases, fumes and vapors, liquids

Answer: (B)

Mounting electrical equipment in masonry requires stable, noncombustible anchors that won’t degrade over time. Wooden plugs in masonry are not suitable because wood can absorb moisture, rot, and warp, which weakens the mounting and can create a path for moisture and corrosion or even a fire hazard in an electrical install. Use metal or appropriate plastic anchors rated for masonry, with proper sleeves or anchors and protect cables with suitable grommets. Environmental factors like damp locations or hazardous vapors are addressed by equipment ratings and installation methods, not by inserting wood into masonry.

Mounting electrical equipment in masonry requires stable, noncombustible anchors that won’t degrade over time. Wooden plugs in masonry are not suitable because wood can absorb moisture, rot, and warp, which weakens the mounting and can create a path for moisture and corrosion or even a fire hazard in an electrical install. Use metal or appropriate plastic anchors rated for masonry, with proper sleeves or anchors and protect cables with suitable grommets. Environmental factors like damp locations or hazardous vapors are addressed by equipment ratings and installation methods, not by inserting wood into masonry.