PSC 113.0919(2)(a)2.2. The unit’s cost.
PSC 113.0919(2)(a)3.3. Information identifying the unit.
PSC 113.0919(2)(a)4.4. Equipment associated with the unit.
PSC 113.0919(2)(a)5.5. The unit’s essential name-plate data.
PSC 113.0919(2)(a)6.6. Dates of the last 2 tests.
PSC 113.0919(2)(a)7.7. Results of the last “as found” and “as left” tests, unless separate records are kept of each test for each unit.
PSC 113.0919(2)(a)8.8. Locations where the unit has been installed, with dates of installation and removal.
PSC 113.0919(2)(b)(b) Meter test records and meter history records may be kept as separate records or one record.
PSC 113.0919(3)(3)Statistical sampling summaries. Each utility authorized to test meters under the statistical sample testing plan of s. PSC 113.0921 shall submit to the commission, by April 15 of the following year, a summary of the statistical sample testing results for the prior calendar year. The summary shall include group and lot numbers; a description of meters in each lot; the number or meters in each lot; the number of meters sample tested in each lot; full load sample mean accuracy (x), estimated standard deviation (s) and total estimated percent defective (P); light load sample mean accuracy x , estimated standard deviation (s) and total estimated percent defective (P); projected annual rates of change for x , s and P at both full and light load analysis points; lots requiring testing and actual x, s and P data from meters where entire lot tests were required under the program; group and lot numbers; a description of meters in each lot and the number of meters in each lot for the succeeding test year.
PSC 113.0919(4)(4)Computerized meter record system. Utilities with more than 5,000 metered customers shall acquire or develop a computerized meter records system and use it for maintaining all required meter equipment records, scheduling and implementing all required meter testing and analyzing meter accuracy performance. The reporting system and software must be acceptable to the commission.
PSC 113.0919 HistoryHistory: Cr. Register, July, 2000, No. 535, eff. 8-1-00; CR 13-033: r. and recr. (1), (2), cr. (3) (title), (4) (title) Register July 2015 No. 715, eff. 8-1-15.
PSC 113.0920PSC 113.0920Statistical sample testing plan for new self-contained single phase and 3-wire network meters. The new meter sample testing plan described in subs. (1) to (5) may be used for testing new self-contained, single phase and 3-wire network meters without mechanical demand registers or mechanical pulsing devices instead of the new meter test requirements of s. PSC 113.0911 (1) (a), if the commission authorizes the adoption of the plan by a utility.
PSC 113.0920(1)(1)Meters, as received from the manufacturer, shall be divided into homogeneous lots by manufacturers and type. The maximum number of meters in any lot may not exceed 1,000 or be less than 96. From each such lot assembled, there shall be drawn a coded sample size specified in Military Standard 414, (MIL-STD-414) dated 11 June 1957, as shown for the various group sizes using Inspection Level IV of Table A-2 on page 4 and a corresponding actual sample size as shown in Table B-3 on page 45. The sample shall be drawn by a random method that ensures that each meter in the lot has an equal chance of being selected.
PSC 113.0920(2)(2)The test criterion for acceptance or rejection of each lot shall be based on a separate analysis conducted at both the full load and light load test points at unity power factor, as specified in s. PSC 113.0811 (1) (c), by means of the Standard Deviation Method, Double Specification Limit and with an Acceptable Quality Level (AQL) of 0.25 for the full load accuracy analysis and an AQL of 0.40 for the light load accuracy analysis as shown in Table B-3, MIL-STD-414, page 45. The statistical analysis calculations shall be made following the example outlined on page 43 of MIL-STD-414 with the upper and lower specification limits U and L designated at 101% and 99% respectively.
PSC 113.0920(3)(3)One non-registering meter may be removed from the sample lot for analysis purposes and replaced with another randomly selected meter. If more than one meter in a sample lot is found not to be registering, the entire lot shall be rejected.
PSC 113.0920(4)(4)A lot shall be deemed acceptable for installation if the total estimated percent defective (P) is less than the appropriate maximum allowable percent defective (M) as determined from Table B-3 under the procedures of sub. (2). All meters in an acceptable lot shall be deemed to have met the accuracy requirements of s. PSC 113.0811 for placement in service without further testing.
PSC 113.0920(5)(5)A lot shall be considered rejected (not acceptable for installation) if the total estimated percent defective (P) is greater than or equal to the appropriate maximum allowable percent defective (M) as determined from Table B-3 under the procedures of sub. (2). All meters in a rejected lot shall be tested and adjusted in accordance with the procedures of s. PSC 113.0811 or replaced with meters meeting these requirements.
PSC 113.0920 HistoryHistory: Cr. Register, July, 2000, No. 535, eff. 8-1-00.
PSC 113.0921PSC 113.0921Statistical sample testing plan for in-service, electronic (solid state) meters and electromechanical, self-contained, single phase and 3-wire network meters.
PSC 113.0921(1)(1)The statistical sample testing plan described in pars. (a) to (e) may be used for testing electronic (solid state) meters and self-contained, single phase and 3-wire network meters without mechanical demand registers or mechanical pulsing devices in place of the periodic testing requirements of s. PSC 113.0911 if the commission authorizes the adoption of the plan by a utility.
PSC 113.0921(1)(a)(a) All extended range, surge proof designed meters shall be divided into homogeneous groups based on meter design features and age. The groups shall be further divided into lot sizes categorized by manufacturer, type, serial number, group size or load duty cycle with lot sizes containing a minimum of 26 meters and a maximum of 110,000 meters. The number of lots or lot composition and size may be changed at the end of the sample testing year to allow for increasing or decreasing analysis of accuracy testing requirements on any segment of meters in any lot.
PSC 113.0921(1)(b)(b) Annually, from each of the assembled lots, a coded sample size specified in Table A-2, Inspection Level IV, page 4 of Military Standard 414, (MIL-STD-414) dated 11 June 1957 and a corresponding actual sample size as shown on Table B-3 page 45, (MIL-STD-414), shall be randomly selected for testing and analysis purposes. Each meter in the lot sample shall be provided with a full load and light load test for accuracy at unity power factor, as specified under s. PSC 113.0811 (1) (c). A separate statistical analysis shall be performed on each lot sample at each of these 2 load ranges. All meters not registering at either full or light load test points shall be removed from the lot sample and replaced with a different randomly selected meter and not more than two lot sample meters operating outside of the accuracy bandwidth of 95% to 105% at either test load point shall be removed and replaced from the lot sample.
PSC 113.0921(1)(c)(c) The statistical analysis calculations for both the full and light load accuracy results from the sample lot tests shall be made following the example outlined on page 43 of MIL-STD-414 with the upper and lower specification limits, U and L designated at 102% and 98% respectively. The test criterion for acceptance or rejection of each lot shall be by the Standard Deviation Method, Double Specification Limit with an Acceptable Quality Level (AQL) of 1.00 for the full load analysis and 4.00 for the light load analysis (both normal inspection) as shown on Table B-3, page 45 of MIL-STD-414.
PSC 113.0921(1)(d)(d) A lot shall be deemed acceptable for continued use if the total estimated percent defective (P) is less than the appropriate maximum allowable percent defective (M) as determined from Table B-3, page 45 of MIL-STD-414, following the procedure of par. (c) for both the full load and light load analysis test points at the respective designated Acceptable Quality Levels. All of the meters in the accepted lot may be retained in use without further accuracy adjustments and will be concluded to have the accuracy characteristics specified in s. PSC 113.0811 (1) (c). Meters in the sample lot may be adjusted for acceptable accuracy as required or maintained as necessary and returned to the lot.
PSC 113.0921(1)(e)(e) A lot shall be deemed unacceptable and rejected for continued use if the total estimated percent defective (P) is greater than or equal to the appropriate maximum allowable percent defective (M) as determined from Table B-3, page 45 MIL-STD-414, following the procedure of par. (c) for both the full load and light load analysis test points at the respective designated Acceptable Quality Levels on any 2 annual sample testing analysis years within a five-year period for the lot or any meters in the lot. All meters in a rejected lot shall be provided with an appropriate test within a period of 48 months from the date of completion of the sample analysis and all the meters tested in the rejected lot shall be adjusted to the accuracies specified in s. PSC 113.0811 (1) (c). All meters in a rejected lot that will not be returned to service shall be removed within 48 months from the date of completion of the sample analysis. These meters may be retired without a test. Annual statistical sample testing shall be terminated during the period when all of the meters in a rejected lot are being provided with a test and accuracy adjustment.
PSC 113.0921(1)(f)(f) All meters in any lot may be tested and adjusted for proper accuracy over a 48-month period at the discretion of the utility without a sample analysis determination specifying the lot test is necessary.
PSC 113.0921(1)(g)(g) Any meter that is included in this plan, which is removed from service for retirement, may be retired without a test.
PSC 113.0921 HistoryHistory: Cr. Register, July, 2000, No. 535, eff. 8-1-00.
PSC 113.0922PSC 113.0922Customer request and commission referee tests.