Mississippi Administrative Code › Title 39 - UTILITIES › Part 3 - RULES AND REGULATIONS GOVERNING PUBLIC UTILITY SERVICE › Subpart 2 - SPECIAL RULES - ELECTRICITY › Chapter 17 - METER TESTING FACILITIES AND EQUIPMENT › Rule 39-3-2-17

Current through June 25, 2024
100. STANDARDIZING LABORATORY Whenever any
				  utility is maintaining or shall hereafter establish and maintain a
				  standardizing laboratory, periodic inspection by the Commission will be made of
				  the instruments and methods in use, and if instruments and methods are
				  acceptable to the Commission after such inspection, certification of meters and
				  instruments for use by that or any other utility may be made by such
				  laboratory. Utilities not maintaining standardizing laboratories may obtain
				  authorization from the Commission to have certification of meters and
				  instruments made for them by any approved standardizing laboratory.
105. FACILITIES AND EQUIPMENT Each utility
				  furnishing metered electric service shall provide or have available for its
				  purpose such meter testing facilities, standard meters, instruments and other
				  equipment and facilities as may be necessary to make the tests required by
				  these rules. Such equipment and facilities shall be acceptable to the
				  Commission and shall be available at all reasonable times for the inspection of
				  any authorized representatives of the Commission. Such equipment and facilities
				  may, if the utility desires, be located outside the State of Mississippi, but
				  wherever located, the Commission shall be informed in writing of the location
				  thereof.
110. TEST STANDARDS
1. PORTABLE TEST INSTRUMENTS Each utility
				  furnishing metered electric service shall provide or have available for its
				  purposes, portable indicating electric testing instruments or watt-hour meters
				  of suitable range and type for testing service watt-hour meters, demand meters,
				  switchboard instruments, recording volt meters, and other electric instruments
				  in use acceptable to the Commission.
2. REFERENCE STANDARDS For testing the
				  accuracy of portable watt-hour meters, commonly called "rotating standards",
				  and other portable instruments used for testing service meters, each utility
				  shall provide or have available for its purposes, as reference or check
				  standards, suitable indicating electrical instruments, watt meters, watt-hour
				  meters, or any or all of them, hereinafter called "reference standards". Such
				  standards may be of the service type of watt-hour meters, but if so, such
				  watt-hour meters shall be permanently mounted in the meter laboratory of the
				  utility and be used for no other purpose than for checking working rotating
				  standards. Reference standards of all kinds will be tested and if necessary
				  adjusted by the Commission at least once a year, unless a standardizing
				  laboratory is maintained as provided for in Section 100 of this rule.
3. PORTABLE WATT-HOUR METERS All portable
				  watt-hour meters (rotating standards), shall be compared with the reference
				  standards at least once each three (3) months during the time such portable
				  testing standards are being regularly used. Unless accompanied by a calibration
				  card, if such check shows any portable watt-hour meter (rotating standards) to
				  be in error more than one (1) per cent plus or minus at any load at
which the standard will be used, such meter shall be
					 tested, adjusted and certified in the laboratory or by the Commission. Each
					 portable watt-hour meter (rotating standards) shall at all times be accompanied
					 by a certificate or calibration card, signed by the proper authority, giving
					 the date when it was last certified and adjusted. Records of certification and
					 calibration shall be kept on file in the offices of the utility for a period of
					 at least one (1) year.
4.
				  PORTABLE TESTING INSTRUMENTS All portable indicating electrical testing
				  instruments, such as volt-meters, ammeters and watt meters, when in regular use
				  for testing purposes, shall be checked against suitable reference standards at
				  least once in three (3) months when continually in use and, if found
				  appreciably in error at zero or in error by more than one (1) per cent of full
				  scale value at commonly used scale deflections, shall, unless accompanied by a
				  calibration card, be adjusted and certified in some approved laboratory or by
				  the Commission. Portable equipment infrequently used shall be compared with a
				  standard before using. All portable indicating electrical instruments used for
				  the companies' own information or general testing purposes shall not be subject
				  to these rules.