www.nfpa.org

National Fire Protection Association (NFPA), publishers of the National Electrical Code®, the Life Safety Code®, the Fire Prevention Code™, the National Fuel Gas Code®, and the National Fire Alarm Code®. The mission of NFPA, which was organized in 1896, is to reduce the worldwide burden of fire and other hazards on the quality of life by providing and advocating scientifically-based consensus codes and standards, research, training, and education.                   

www.csa-international.org
 

CSA International is an independent, not-for-profit organization supported by more than 8,000 members. CSA has a network of offices, partners, and strategic alliances in Canada, the U.S., and around the world. Established in 1919, CSA International is a leader in the field of standards development and the application of these standards through product certification, management systems registration, and information products.
 

www.ul.com

Underwriters Laboratories Inc. Technical Information for Hazardous Locations

www.ashrae.org

ASHRAE, the American Society of Heating, Refrigerating and Air-Conditioning Engineers, is an international organization of 50,000 persons with chapters throughout the world. The Society is organized for the sole purpose of advancing the arts and sciences of heating, ventilation, air conditioning and refrigeration for the public's benefit through research, standards writing, continuing education and publications.

www.acca.org

ACCA is the nation's premier trade association of heating, ventilating, air conditioning, and refrigeration (HVACR) contractors. With local chapters across the country, ACCA's membership also includes manufacturers of HVACR equipment, wholesalers and distributors, vocational and technical schools, facilities operators, and others.