Rules & Regulations of the State of Tennessee
Title 1220 - Tennessee Public Utility Commission
Subtitle 1220-04 - Division of Public Utilities
Chapter 1220-04-04 - Regulations for Electric Companies
Section 1220-04-04-.45 - EQUIPMENT FOR VOLTAGE MEASUREMENTS

Universal Citation: TN Comp Rules and Regs 1220-04-04-.45

Current through September 24, 2024

(1) Standards

Each utility shall have at least one (1) indicating voltmeter with a stated accuracy within one quarter percent (0.25%) of full scale. This instrument must be maintained within its stated accuracy.

(2) Working Instruments

(a) Each utility shall have at least two (2) indicating voltmeters with a stated accuracy within one percent (1.0%) of full scale.

(b) Each utility must have at least two (2) portable recording voltmeters with a stated accuracy within one and one half percent (1.5%) of full scale.

(3) Standards must be checked periodically (see Rule 1220-4-4-.39(2)) at the National Institute of Standards and Technology (NIST), or at a laboratory acceptable to the Authority.

(4) Working instruments be checked periodically (see Rule 1220-4-4-.39(2)) by comparison with a standard in the utility's meter shop.

(5) Extreme care must be exercised in the handling of standards and instruments to assure that their accuracy is not disturbed.

(6) Each standard shall be accompanied at all times by a certificate or calibration card, duly signed and dated, on which are recorded the corrections required to compensate for errors found at the customary test points at the time of the last previous test.

Authority: T.C.A. § 65-2-102.

Disclaimer: These regulations may not be the most recent version. Tennessee may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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