39 Miss. Code. R. 3-2-17

Current through October 31, 2024
Rule 39-3-2-17
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.

39 Miss. Code. R. 3-2-17