February 8, 2017. The National Institute of Standards and Technology (NIST) is a standards laboratory that is part of the U.S. Department of Commerce. The NIST traceable calibration refers to a program that certifies that the equipment used by labs or manufacturing facilities is properly calibrated according to the industry standards in place.
Quick Answer. VAC is an electrical voltage in an alternating current circuit. The power system supplying homes and businesses in the United States uses AC 120 V, while in Europe the system uses AC 240 V. Continue Reading.
The common wire in a 120 vac system would be the neutral, the term line is used for incoming power to a device. Line can be made of two ungrounded conductors (hots) or one ung â¦ rounded conductor and one grounded conductor(neutral).