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Standard 41.11 prescribes methods for power measurements. This first edition of the standard includes electrical and nonelectrical power measurements for heating, ventilating, air-conditioning, and refrigerating (HVAC&R) laboratory and field applications. It also also contains descriptions and measurement methods for the predominant forms of nonelectrical power in HVAC&R applications, including shaft power, the power derived from the first law of thermodynamics, and the fluid power output from a pump.

This standard is intended to be used with IEEE 120-1989, Master Test Guide for Electrical Measurements in Power and relies on IEEE 120 to provide fundamental guidance and more detailed information for electrical power measurement. http://standards.ieee.org/findstds/standard/120-1989.html