(C) Powder Coating
Exception: Where portable electric luminaires are required for operations in spaces not readily illuminated by fixed lighting within the spraying area, they shall be of the type listed for Class II, Division 1 locations where readily ignitible residues may be present.
(a) Transformers, power packs, control apparatus, and all other electrical portions of the equipment shall be located outside the powder-coating area or shall otherwise comply with the requirements of 516.10(C)(1).
Exception: The charging electrodes and their connections to the power supply shall be permitted within the powder-coating area.
(b) All electrically conductive objects within the powder-coating area shall be adequately grounded. The powder-coating equipment shall carry a prominent, permanently installed warning regarding the necessity for grounding these objects.
Informational Note: For more information on grounding and bonding for static electricity purposes, see NFPA 33-2018, Standard for Spray Application Using Flammable or Combustible Materials; NFPA 34-2018,, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, and NFPA 77-2019, Recommended Practice on Static Electricity.
(c) Objects being coated shall be maintained in electrical contact (less than 1 megohm) with the conveyor or other support in order to ensure proper grounding. Hangers shall be regularly cleaned to ensure effective electrical contact. Areas of electrical contact shall be sharp points or knife edges where possible.
(d) The electrical equipment and compressed air supplies shall be interlocked with a ventilation system so that the equipment cannot be operated unless the ventilating fans are in operation. [33:Chapter 15]