OSHA 1910.252 / AWS Z49.1

OSHA 1910.138 / SMACNA Safety Manual

Raw sheet metal edges are razor-sharp and cause severe lacerations. OSHA and SMACNA safety standards require cut-resistant gloves (ANSI A4 or higher) when handling unfinished sheet metal. This is the #1 injury in sheet metal shops.

OSHA 1910.147 / NFPA 70E 120.5

Removing an MCC bucket while the bus is energized exposes the worker to live 480V bus stabs and creates an arc flash hazard. OSHA 1910.147 and NFPA 70E require the MCC to be de-energized and locked out/tagged out before withdrawing any bucket unless the equipment is specifically designed for hot-swap operation.

OSHA 1910.212 / SMACNA Safety Manual

Pittsburgh lock seam machines have pinch points that can amputate fingers. Machine guards are required by OSHA and must never be bypassed or removed. SMACNA apprenticeship training specifically emphasizes: never defeat a machine guard.

OSHA 1910.252(c) / ACGIH TLV Guidelines

OSHA 1910.252(c) requires adequate ventilation for all welding operations. In confined or enclosed spaces, mechanical ventilation must provide a minimum of 2,000 CFM per welder. Welding fumes contain hexavalent chromium, manganese, and other toxic metals that exceed OSHA PELs without proper exhaust ventilation.

OSHA 1926.251 / ASME B30.9 — Slings

Nylon slings in contact with sharp edges must have corner protectors (softeners) to prevent the sling from being cut under load. A sling failure under a 2,000 lb load is a fatal hazard. OSHA and ASME B30.9 require edge protection whenever a sling contacts a sharp radius.

OSHA 1926.753 / ASME B30.5

Suspended loads must have a tag line to allow workers to guide the load without placing hands on it. Without a tag line, workers must physically push/pull the suspended load, putting them in the fall zone — a leading cause of rigging fatalities.