Mich. Admin. Code R. 460.3610
Current through Vol. 24-21, December 1, 2024
Rule 610. All portable indicating voltmeters that are used for determining the quality of service voltage to customers must be checked against a suitable secondary reference standard at least once every 6 months for electro-mechanical voltmeters, and once every 12 months for solid state voltmeters. The accuracy of these voltmeters must be rated so that the error of the indication is not more than plus or minus 1% of full scale. If the portable indicating voltmeter is found to be in error by more than the rated accuracy at commonly used scale deflections, it must be adjusted.
Mich. Admin. Code R. 460.3610