Quick Hits

Episode 4: Flexible Cords, Installation Rules & Bonding (506.17 – 506.30)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Zone Dust Cords & Bonding (Part 4) ⚡

What are the temperature caps for nonmetal dusts that carbonize? How do you bond raceways in Zone dust environments? Let's finish Article 506! 👇

SLIDE 2 (FLEXIBLE CORDS & EXPOSED PARTS)

Portable Equipment Rules:

• Flexible Cords: Must be extra-hard usage types containing an equipment grounding conductor, supported by clamps to minimize terminal tension, and terminated with listed cord connectors maintaining the protection technique.

• Uninsulated Parts: Operating at over 30V (15V wet) must be protected by "ia", "ib", or "ic" protection techniques suitable for the location.

SLIDE 3 (TEMPERATURE LIMITS & BONDING)

Carbonization Caps & Ground Continuity:

• Surface Temperature Caps: For nonmetal dusts that dehydrate or carbonize, temperature markings must not exceed the lower of the ignition temperature or 165°C (329°F). For ignitable fibers, the cap is 165°C normally or 120°C (248°F) for overloaded equipment like motors.

• Bonding: Metal parts and raceways must be bonded wrench-tight using threaded entries or listed fittings, prohibiting double-locknuts around impaired knockouts.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Equipment marked Group IIIC (metal dust) can be used for applications requiring Group IIIB or IIIA, giving you built-in versatility for multi-part material handling facilities!

💬 Save this post for your final code review on Zone Combustible Dust Locations!

🔗 More code breakdowns and study tools at www.JoshTheSparky.com

← View Chapter 5 Home

← Article 506 Zone Locations for Combustible Dusts or Ignitable Fibers and Flyings

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