posted to convey the following:
(1) Designate the process zone as dangerous with regard to fire and accident
(2) Identify the grounding requirements for all electrically conductive objects in the spray area
(3) Restrict access to qualified personnel only
(9) Insulators. All insulators shall be kept clean and dry.
(10) Other Than Nonincendive Equipment. Spray equipment that cannot be classified as nonincendive shall comply with (A)(10)(a) and (A)(10)(b).
(a) Conveyors or hangers shall be arranged so as to maintain a safe distance of at least twice the sparking distance between goods being painted and electrodes, electrostatic atomizing heads, or charged conductors. Warnings defining this safe distance shall be posted. [33:11.4.11
(b) The equipment shall provide an automatic
means of rapidly de-energizing the high-voltage
elements in the event the distance between the goods
being painted and the electrodes or electrostatic
atomizing heads falls below that specified in (a).
[33:11.3.8]
(B) Electrostatic Hand-Spraying Equipment. This sec- tion shall apply to any equipment using electrostatically charged elements for the atomization, charging, and/or precipitation of materials for coatings on articles, or for other similar purposes in which the atomizing device is handheld or manipulated during the spraying operation. Electrostatic hand-spraying equipment and devices used in connection with paint- spraying operations shall be of listed types and shall comply with 516.10(B)(1) through (B)(5).
(1) General. The high-voltage circuits shall be designed so as not to produce a spark of sufficient intensity to ignite the most readily ignitible of those vapor-air mixtures likely to be encountered, or result in appreciable shock hazard upon coming in contact with a grounded object under all normal operating
conditions. The electrostatically charged exposed elements of the handgun shall be capable of being energized only by an actuator that also controls the coating material supply.
(2) Power Equipment. Transformers, power packs, control apparatus, and all other electrical portions of the equipment shall be located outside of the Class I location or be identified for the location.
Exception: The handgun itself and its connections to the power supply shall be permitted within the Class I location.
(3) Handle. The handle of the spraying gun shall be electrically connected to ground by a metallic connection and be constructed so that the operator in normal operating position is in intimate electrical contact with the grounded handle to prevent buildup of a static charge on the operator's body. Signs indicating the necessity for grounding other persons entering the spray area shall be conspicuously posted.
(4) Electrostatic Equipment. All electrically conductive objects in the spraying area shall be adequately grounded. This requirement shall apply to paint containers, wash cans, and any other electrical conductive objects or devices in the area. The equipment shall carry a prominent, permanently installed warning regarding the necessity for this grounding feature.
FPN: For more information on grounding and bonding for static electricity purposes, see NFPA 33-
2007, Standard for Spray Application Using
Flammable or Combustible Materials; NFPA 34-2007,
Standard for Dipping and Coating Processes Using
Flammable or Combustible Liquids; and NFPA 77-
2007, Recommended Practice on Static
Electricity.