Quick Hits

Episode 2: Spray Application Processes & Booth Classifications (516.7)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Spray Booth Area Classifications (Part 2) ⚡

How far do hazardous boundaries extend around open-face spray booths, exhaust ducts, and unenclosed finishing operations? Let's check Section 516.7! 👇

SLIDE 2 (DIVISION 1 / ZONE 1 SPACES)

High-Hazard Zones:

• Booth Interiors: The interior of spray booths and rooms, exhaust ducts, and any area directly in the path of spray operations are classified as Class I, Division 1; Class I, Zone 1; Class II, Division 1; or Zone 21, depending on the material.

• Sumps & Pits: Pits or below-grade channels within 7620 mm (25 ft) horizontally of a vapor source are Division 1 / Zone 1 unless provided with a vapor stop.

SLIDE 3 (DIVISION 2 / ZONE 2 SPACES)

Adjacent Hazard Boundaries:

• Unenclosed Spraying: Electrical equipment located outside but within 6100 mm (20 ft) horizontally and 3050 mm (10 ft) vertically of an unenclosed spray area must be suitable for Class I, Division 2 / Zone 2 (or Class II, Division 2 / Zone 22).

• Open-Face Booths: For closed-top, open-face, or open-front spray booths, electrical equipment located within 915 mm (3 ft) of any opening extending from the edges of the open face must be suitable for Division 2 / Zone 2.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Never mix the Division system and the Zone system for any given source of release—you must stick to one classification methodology per area!

💬 Save this post for your next commercial paint line design!

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