1. (a) Initial and test adjustments.

   1. (1)

      1. (A) No watt-hour meter that has an incorrect register constant, test constant, gear ratio, or dial train, or that registers upon no load (“creeps”) shall be placed in service or allowed to remain in service without adjustment and correction.
      2. (B) An in-service meter “creeps” when, with potential applied to all stators and with all load wires disconnected, the moving element makes one (1) complete rotation in ten (10) minutes or less.

   2. (2)

      1. (A) No watt-hour meter that has an error in registration of more than the limits allowed in subdivision (b)(1) of this section shall be placed in service or be allowed to remain in service without adjustment.
      2. (B) When meter error is found to exceed any one (1) of the test limits in subdivision (b)(1) of this section, it must be adjusted and a correction made to the customer's bill in accordance with the Arkansas Public Service Commission's General Service Rules, 23 CAR § 455-519.
   3. (3) Meters must be adjusted as closely as practicable to the condition of zero error but no greater than plus or minus five-tenths percent (0.5%).

2. (b) Acceptable performance.

   1. (1) Watt-hour meter accuracy. The average error of the watt-hour meter shall not exceed plus or minus two percent (2%). Test Current Power Factor Accuracy Heavy Load 100% Test Amperes 1.0 ±2% 100% Test Amperes 0.5 ±2% Light Load 10% Test Amperes 1.0 ±2%
   2. (2) Demand meter accuracy. The error of the demand register shall not exceed plus or minus four percent (4%) of full-scale value when tested between twenty-five percent (25%) and one hundred percent (100%) of full-scale value.

   3. (3) Pulse recorders.

      1. (A) Pulse recorders shall not differ by more than plus or minus two percent (2%) from the corresponding kilowatt-hour meter registration.
      2. (B) The timing error shall not exceed plus or minus two (2) minutes per day.
   4. (4) Time-of-use meters. The timing element of time-of-use meters shall not be in error with central standard/daylight savings time by more than plus or minus fifteen (15) minutes.

3. (c) Average error.

   1. (1) The average error of a service watt-hour meter shall be determined as follows: WA = LL + 4HL 5 Where: WA = weighted average error of a service watt-hour meter LL = error at light load for 100 percent power factor HL = error at heavy load for 100 percent power factor
   2. (2) The average error of the watt-hour portion of a demand meter shall be determined as follows: WA = LL+ 4HL + 2HHL 7 Where: WA = weighted average error of the watt-hour portion of a demand meter LL = error at light load for 100 percent power factor HL = error at heavy load for 100 percent power factor HHL = error at heavy load with 50 percent lagging power factor

Codification Notes: This section was promulgated as Rule 7.05 of the Special Rules — Electric prior to codification in the Code of Arkansas Rules.