Written by: Garrick Johnson, Health Consultant
Electrical wiring or equipment not subject to deposits of combustible residues but located within a spraying area was not of the explosion proof type approved for this hazardous location. Specifically, standard fluorescent lighting fixtures were used to illuminate an inside spray booth.
OSHA 1910.107(c)(4) – Wiring conformance. Electrical wiring and equipment shall conform to the provisions of this paragraph and shall otherwise be in accordance with subpart S of this part.
NFPA 33 6.4 – Electrical Devices in Spray Areas.
General purpose wiring and electrical equipment can cause explosions and fires in areas where flammable vapors and liquids are present. These areas require special electrical equipment which is designed for the specific hazard involved. Many electrical components arc, spark, or produce heat under normal operating conditions. In designing equipment for hazardous locations, these components are either replaced by lower powered substitutes or shielded from contact with the atmosphere or the equipment chassis.
The Occupational Safety and Health Administration (OSHA) and the National Fire Prevention Association (NFPA) specifically state in their standards that electrical equipment and wiring designed for use in hazardous atmospheres must be installed in spray booths.
For more information about Spray booths, click here.