Quick Hits

Episode 2: Enclosures, Flexible Connections & GFCI Exemptions (547.22 – 547.28)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Farm Enclosures & GFCI Rules (Part 2) ⚡

Dusttight enclosures, flexible connections, and surprising GFCI exemptions in damp animal areas—let's check Sections 547.22 through 547.28! 👇

SLIDE 2 (ENCLOSURES & CORROSION RESISTANCE)

Defending Against Dust and Moisture:

• Dusttight Design: Enclosures, boxes, and fittings in dusty areas must minimize dust entry and feature no openings through which dust can enter.

• Wet Locations: Equipment in wet washdown areas must be listed for use in wet locations.

• Corrosion Resistance: Enclosures must feature corrosion resistance properties suitable for damp, wet, or vapor-heavy conditions (note that aluminum and magnetic ferrous materials can corrode quickly in farm environments).

SLIDE 3 (FLEXIBLE CONNECTIONS & PROTECTION)

Flexible Links & Rodent Guards:

• Permitted Flex: Dusttight flexible connectors, LFMC, LFNC, or hard-usage flexible cords with dusttight connectors.

• Concealed Cable Ban: Nonmetallic cables are prohibited from being concealed within walls and ceilings of offices, lunchrooms, or ancillary areas contiguous with livestock confinement zones due to rodent damage.

• Underground EGCs: Separate equipment grounding conductors installed underground must be insulated.

SLIDE 4 (GFCI EXEMPTIONS)

Where GFCIs Are NOT Required:

• GFCI protection is not required for 125-volt, 15- and 20-ampere receptacles installed in: (1) areas requiring an equipotential plane, (2) outdoors, (3) damp or wet locations, and (4) dirt confinement areas for livestock.

💡 Apprentice Pro-Tip: Insulating underground EGCs in farm runs protects against aggressive soil corrosion and stray voltage!

💬 Save this post for your next agricultural equipment layout!

🔗 More code breakdowns at www.JoshTheSparky.com

← View Chapter 5 Home

← Article 547 Agricultural Buildings

← Back To Quick Hits Home