NFPA 652 / NFPA 69 / OSHA 1910.22
What it means on the job
Ductwork carrying combustible dust to a collector must have spark detection and/or suppression systems to intercept incendiary sparks before they reach the collector. NFPA 652 (Standard on the Fundamentals of Combustible Dust) and NFPA 69 require spark mitigation for processes that generate sparks, such as grinding, cutting, or welding operations.
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Related NFPA sections
NFPA 51B Section 9.3 / OSHA 1910.252(a)
NFPA 51B (Standard for Fire Prevention During Welding, Cutting, and Other Hot Work) requires all combustible and flammable materials to be removed at least 35 feet from the hot work operation. If materials cannot be moved, they must be protected with fire-resistant covers. A 20-foot clearance is insufficient and creates a direct fire ignition risk.
NFPA 51B Section 9.5 / OSHA 1910.252(a)(2)(iii)(B)
OSHA 1910.252(a)(2)(iii)(B) and NFPA 51B require a fire watch when hot work is performed in locations where other than minor fires might develop or where combustible materials are closer than 35 feet. The fire watch must continue for at least 30 minutes after hot work ceases and must have fire extinguishing equipment immediately available.
NFPA 652 / ACGIH Industrial Ventilation Manual Chapter 7
The exhaust fan must be located downstream of the dust collector (clean-air side) to prevent abrasive particulate from eroding fan blades and housing. Fan erosion causes imbalance, vibration, premature failure, and potential spark generation in explosive dust environments. NFPA 652 and ACGIH guidelines require clean-air-side fan placement.
NFPA 68 / NFPA 484 / OSHA 1910.94
Aluminum dust is highly combustible and explosive. Dust collectors handling combustible metals must have explosion relief vents sized per NFPA 68 to safely relieve deflagration pressure. Without relief venting, an internal dust explosion can rupture the collector, sending shrapnel and flame into the facility.
NFPA 70E 110.4(B) / 120.1
Damaged test lead insulation can expose the user to electrical shock and can cause phase-to-phase or phase-to-ground short circuits resulting in arc flash. All test equipment must be inspected before each use per NFPA 70E and replaced if damaged.
NFPA 70E 130.7(C)(10)
A standard face shield does not provide arc-rated protection for the face and neck. Category 3 requires an arc-rated balaclava worn under an arc-rated face shield and hard hat to protect exposed skin from arc flash burns.
CraftIQ explanations are original educational commentary written in trade language and verified against the cited standards. Always confirm requirements against the code edition adopted by your jurisdiction — this is training material, not a substitute for the code book or your AHJ.