Chapter PSC 113

PSC 113.0912(1) (1) Self-contained polyphase meters together with associated equipment such as demand equipment, control devices, etc., shall be tested on the customer’s premises, a central testing facility or in a mobile test facility, except pars. (a) and (d), for accuracy at unity and 50% power factor under the following circumstances:

PSC 113.0912(1)(a) (a) Before being placed in service. For new meters given a prior test by the manufacturer, the manufacturer’s certified test results may be substituted for this requirement.

PSC 113.0912(1)(b) (b) When they are suspected of being inaccurate or damaged.

PSC 113.0912(1)(c) (c) When the accuracy is questioned by a customer. (See s. PSC 113.0922.)

PSC 113.0912(1)(d) (d) Within 60 days after they are removed from service.

PSC 113.0912(1)(e) (e) Within a period of 6 months before or 6 months after 8 years of service for non-surge-proof and 12 years for surge-proof meters. Exception: Thermal and mechanical lagged-demand meters shall be tested every 8 years. Electronic (solid state) meters may be tested instead in accordance with the plan outlined in s. PSC 113.0921.

PSC 113.0912(2) (2) A stator balance test shall be performed on all new meters before being placed in service.

PSC 113.0912(3) (3) Meters with electronic programmable registers may be shop tested on a periodic basis.

PSC 113.0912 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00; CR 02-027: am. (1) (intro.) and (a), Register December 2002 No. 564, eff. 1-1-03.

PSC 113.0913 PSC 113.0913 Testing of meters used with instrument transformers on single-phase service. In this section, “meter” or “meters” may refer to metering system(s).

PSC 113.0913(1) (1) Meters used with instrument transformers on single-phase service, together with associated equipment such as demand equipment, control devices, etc., shall be tested on the customer’s premises, a central testing facility or in a mobile test facility, except pars. (a) and (d), for accuracy at unity power factor under the following circumstances:

PSC 113.0913(1)(a) (a) Before being placed in service. For new meters given a prior test by the manufacturer, the manufacturer’s certified test results may be substituted for this requirement.

PSC 113.0913(1)(b) (b) When they are suspected of being inaccurate or damaged.

PSC 113.0913(1)(c) (c) When the accuracy is questioned by a customer. (See s. PSC 113.0922.)

PSC 113.0913(1)(d) (d) When they are removed from service.

PSC 113.0913(1)(e) (e) Within a period of 6 months before or 6 months after 8 years of service for non-surge-proof and 12 years for surge-proof meters. Exception: Lagged-demand meters shall be tested every 8 years. Electronic (solid state) meters may be tested instead in accordance with the plan outlined in s. PSC 113.0921.

PSC 113.0913(2) (2) Meters equipped with electronic programmable registers may be shop tested on a periodic basis.

PSC 113.0913 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00; CR 02-027: am. (1) (intro.) and (a), Register December 2002 No. 564, eff. 1-1-03.

PSC 113.0914 PSC 113.0914 Testing of polyphase electromechanical and completely solid state electronic meters used with instrument transformers at fixed periodic intervals. In this section, “meter” or “meters” may refer to metering system(s).

PSC 113.0914(1) (1) Polyphase meters used with instrument transformers, together with associated equipment such as demand equipment, pulsing devices, phase-shifting transformers, control devices, etc., shall be tested on the customer’s premises, a central testing facility or in a mobile test facility, except for pars. (a) and (d), for accuracy at unity and 50% power factor under the following circumstances.

PSC 113.0914(1)(a) (a) Before being placed in service. For new meters given a prior test by the manufacturer, the manufacturer’s certified test results may be substituted for this requirement.

PSC 113.0914(1)(b) (b) When they are suspected of being inaccurate or damaged.

PSC 113.0914(1)(c) (c) When the accuracy is questioned by a customer. (See s. PSC 113.0922.)

PSC 113.0914(1)(d) (d) When they are removed from service.

PSC 113.0914(1)(e) (e) Within a period of 4 months before or 4 months after 2 years of service for non-magnetic-bearing electromechanical meters, 4 years of service for electromechanical magnetic-bearing surge-proof meters and 6 years of service for completely solid state electronic meters with electronic registers capable of down-loading voltage and current monitoring readings from the instrument transformers to digital meter reading devices at meter reading intervals. Exception: Electronic (solid state) meters may be tested instead in accordance with the plan outlined in s. PSC 113.0921.

PSC 113.0914(2) (2) A stator balance test shall be performed on all new meters before being placed in service.

PSC 113.0914(3) (3) Meters with electronic programmable registers may be shop tested on a periodic basis.

PSC 113.0914 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00; CR 02-027: am. (1) (intro.) and (a), Register December 2002 No. 564, eff. 1-1-03.

PSC 113.0915 PSC 113.0915 Testing of metering installations utilizing pulse devices.

PSC 113.0915(1) (1) Metering installations utilizing pulse initiators and pulse recorders shall be checked for accuracy each billing period by comparing the recorded pulse count against the registration of the corresponding meter. When the results are not in agreement within the accuracy limits of s. PSC 113.0812 (2) the pulse devices shall be promptly tested and adjusted to required accuracy or replaced.

PSC 113.0915(2) (2) Pulse devices shall be tested before use and as part of the complete metering installation whenever the associated watthour meter is tested.

PSC 113.0915 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00.

PSC 113.0916 PSC 113.0916 Testing of instrument transformers.

PSC 113.0916(1) (1) No instrument transformer shall be placed in service, or allowed to remain in service, if it shows evidence of physical damage, discolored terminals due to overload, change in texture or resiliency of insulation, or arc tracking on the insulation or bushings.

PSC 113.0916(2) (2) Instrument transformers of all utilities shall be tested for voltage withstand by the manufacturer, the utility, or a laboratory approved for such test by the commission before being placed in service. Each instrument transformer that has been removed from service shall be tested for voltage withstand prior to reinstallation if the reason for removal or physical appearance, gives cause to doubt its reliability. The utility shall maintain a record of all such tests.

PSC 113.0916(3) (3) Instrument transformers of class A privately-owned utilities shall be tested at the utility meter shop or the manufacturers’ certified test reports may be used to determine accuracy (ratio correction factor and phase angle):

PSC 113.0916(3)(a) (a) Before being initially placed in service.

PSC 113.0916(3)(b) (b) When removed from service.

PSC 113.0916(3)(c) (c) When there is evidence from outward appearance or performance to suspect inaccuracy.

PSC 113.0916(3)(d) (d) The manufacturer’s calibration results may be acceptable on all new voltage transformers rated above 15,000 volts. Removal tests of these transformers may also be omitted except in those cases where there is reason to suspect that a transformer malfunction has occurred.

PSC 113.0916(4) (4) Instrument transformers of other than class A private-owned utilities shall be tested at the utilities meter shop, the manufacturer’s laboratory or a laboratory approved by the commission for accuracy (ratio correction factor and phase angle):

PSC 113.0916(4)(a) (a) Before being initially placed in service.

PSC 113.0916(4)(b) (b) When there is evidence from outward appearance or performance to suspect inaccuracy.

PSC 113.0916(5) (5) Instrument transformers in service shall be given an approved check (such as the variable burden method in the case of current transformers or a field check of the secondary voltage with a good quality voltmeter in the case of voltage transformers) made in conjunction with each field test of the associated watthour meter. When such check provides evidence that the instrument transformer may be inaccurate, that instrument transformer shall be tested for accuracy.

PSC 113.0916 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00.

PSC 113.0917 PSC 113.0917 Phase-shifting transformers and loss compensators.

PSC 113.0917(1) (1) For phase-shifting transformers in service, all terminal connections shall be in such condition as to provide good electrical contact and the terminal designations shall be clearly visible. Where there is evidence of physical damage or evidence of thermal overload the unit shall be replaced.

PSC 113.0917(2) (2) Phase-shifting transformers shall be tested on the same schedule and at the same time as the meters with which they are associated. The test shall consist of a single-phase test to be performed as follows: With the approximate rated voltage applied to the input terminals and no burdens connected to the tap terminals all tap voltages, converted to percentage of input voltage, shall agree within plus or minus 2.0% of the theoretical values given in the manufacturer’s published data.

PSC 113.0917(3) (3) In addition, all units shall be tested before use and when returned to the utility’s meter laboratory. For these tests the output-voltage values in terms of percentage of input voltage and under the conditions of sub. (2) immediately above shall agree within plus or minus 1.0%.

PSC 113.0917(4) (4) For transformer-loss compensators in service all terminal connections shall be in such condition as to provide good electrical contact and the terminal designations shall be clearly visible. Where there is evidence of physical damage to the component parts, their adjustments, or to the internal wiring or evidence of thermal overload on the insulation, resistors, terminals, etc., the affected parts shall be replaced or the entire transformer-loss compensator replaced.

PSC 113.0917(5) (5) Transformer-loss compensators shall be tested on the same schedule and at the same time as the meters with which they are associated.

PSC 113.0917(6) (6) The tests shall be made at the normal service test points of the meter. Performance deviations from desired performance shall not exceed plus or minus 0.3%.

PSC 113.0917 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00.

PSC 113.0918 PSC 113.0918 Adoption of standard by reference.

PSC 113.0918(1) (1) Adoption of standard. Military Standard 414 (Mil-STD-414) dated June 11, 1957, is hereby incorporated by reference into ch. PSC 113 in part consisting of the cover page and pages 1, 2, 3, 4, 41, 42, 43, 45, 47, 48, 49, 50, 51 and 110. This published standard is entitled “Sampling Procedures and Tables for Inspection by Variables for Percent Defective” and is referenced in ss. PSC 113.0920 and 113.0921 herein for application of these rules on maintenance of electric meter accuracy by statistical sample testing methods. Interim amendments to MIL-STD-414 will not be effective in this state until such time as this chapter is revised to reflect such changes.

PSC 113.0918(2) (2) Consent to incorporate. Pursuant to s. 227.21, Stats., the attorney general and the legislative reference bureau have consented to the incorporation by reference of MIL-STD-414 in part as designated in sub. (1). Copies are on file in the offices of the commission, the secretary of state and the legislative reference bureau.

PSC 113.0918(3) (3) Availability of standard. Copies of that part of MIL-STD-414 adopted herein may be obtained from the commission. Copies of the entire MIL-STD-414 may be ordered from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.

PSC 113.0918 History History: Cr. Register, July, 2000, No. 535, eff. 8-1-00; correction made in (2) under s. 13.92 (4) (b) 6., Stats., Register April 2013 No.688.

PSC 113.0919 PSC 113.0919 Metering equipment records.

PSC 113.0919(1) (1) Meter test records.

PSC 113.0919(1)(a) (a) A utility shall keep a record of a test whenever a unit of metering equipment is tested. The meter test record shall include all of the following:

PSC 113.0919(1)(a)1. 1. Information to identify the unit of metering equipment.

PSC 113.0919(1)(a)2. 2. The service address at which the unit of metering equipment is installed.

PSC 113.0919(1)(a)3. 3. The equipment with which the unit of metering equipment is associated.

PSC 113.0919(1)(a)4. 4. The date of the test.

PSC 113.0919(1)(a)5. 5. The reason for the test.

PSC 113.0919(1)(a)6. 6. A statement of “as found” accuracies.

PSC 113.0919(1)(a)7. 7. A statement of “as left” accuracies, when applicable.

PSC 113.0919(1)(a)8. 8. The name of the person making the test.

PSC 113.0919(1)(a)9. 9. The readings before and after the test.

PSC 113.0919(1)(a)10. 10. A statement as to whether or not the unit of metering equipment “creeps” and in case of creeping, all of the following:

PSC 113.0919(1)(a)10.a. a. The rate.

PSC 113.0919(1)(a)10.b. b. A statement of “as found” and “as left” accuracies sufficiently complete to permit checking of the calculations employed.

PSC 113.0919(1)(a)10.c. c. Indications showing that all required checks have been made.

PSC 113.0919(1)(a)10.d. d. A statement of repairs made by the utility, if any, or a notation that the unit was returned to the manufacturer for repairs.

PSC 113.0919(1)(a)10.e. e. Identification of the testing standard.

PSC 113.0919(1)(b) (b) Meter test records and meter history records may be kept as separate records or one record.

PSC 113.0919 Note Note: Meter test records need not be separately retained from meter history records provided that the meter test records are incorporated into the meter history records.

PSC 113.0919(2) (2) Meter history records.

PSC 113.0919(2)(a) (a) Each utility shall keep a history record for each unit of metering equipment showing all of the following:

PSC 113.0919(2)(a)1. 1. The date the unit was purchased.

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.