California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 20 - Flammable Liquids, Gases and Vapors
Article 136 - Dip Tanks
Section 5432 - Electrical and Other Sources of Ignition

(a) There shall be no open flames, spark producing devices, or heated surfaces having a temperature sufficient to ignite vapors in any vapor area.

(b) Except as specifically permitted in Section 5438, relating to electrostatic apparatus, electrical wiring and equipment in any vapor area shall be explosion proof type approved for Class I, Group D locations and shall otherwise conform to the provisions of the Electrical Safety Orders, Class I, Division 1.

NOTE: It will be observed that the presence of ordinary infra-red drying lamps is prohibited in any vapor area; however, their use is permitted when adequate ventilation is maintained in such manner that their location is not within the vapor area.

(c) Unless specifically approved for locations containing both deposits of readily ignitible residues and explosive vapors, there shall be no electrical equipment in the vicinity of dip tanks, or associated drain boards or drying operations, which are subject to splashing or dripping of dip tank liquids. However, wiring in rigid conduit or in threaded boxes or fittings containing no taps, splices or terminal connections is permitted.

(d) In any floor space outside a vapor area but within 20 feet therefrom, and not separated by tight partitions, there shall be no open flames or spark producing devices [except as specifically permitted in NFPA Standard No. 86A, Ovens and Furnaces (Paragraph 200-7)] and electrical wiring and equipment shall conform to the provisions of the Electrical Safety Orders, Class I, Division 2.