Electric wiring carrying voltages greater than 12 volts shall be in armored cable or in conduit and, if dry ingredients are employed, the wiring shall be in accordance with the provisions of Part 3, Title 24, California Administrative Code. The materials protecting the electric wiring must be of such composition so that they will not be chemically attacked by the ingredients being processed.
Cal. Code Regs. Tit. 19, § 1580.3