Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 23 - LAUNDERING AND DYEING ESTABLISHMENTS
Subchapter B - DRYCLEANING AND DYEING
CLASS II AND III PLANTS-ADDITIONAL REQUIREMENTS
Section 23.123 - Lighting and fixtures

Lighting shall be by electricity employing incandescent lights. All wiring shall be in rigid conduit installed in accordance with the provisions of Chapter 39 (relating to safety standards-general). Lighting fixtures, switches, communication and signalling equipment, other fixed portable devices, and all motors approved for such installations shall be of the explosion-proof type for Class II installations. Requirements for Class III drycleaning machinery are similar to those of Class II with the exception that explosion-proof motors and light fictures are not required for the Class III drycleaning machinery.