(a) Where Class II systems are used all electrical equipment in dry cleaning rooms or other sections subject to flammable vapors shall be of a type approved for Class I, Division 1 hazardous locations, except that electrical equipment located 8 feet or more above the floor may be of the type approved for Class I, Division 2 hazardous locations under the National Electrical Code.
(b) Where Class III systems are used, electrical equipment for light and power shall be installed in a safe manner. Compliance with the applicable provisions for ordinary locations of the Standards of the National Board of Fire Underwriters known as the “National Electrical Code” shall be deemed prima facie evidence of compliance with this subsection.