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Title 17 . Transportation and Public Facilities
Chapter 90 . Miscellaneous Provisions
Section 470. Watthour meter test

17 AAC 90.470. Watthour meter test

(a) The watthour meter test must consist of a light load test, a full load test, and 50 percent power factor as follows:

(1) the light load test is 10 percent of the meter current rating or test amperage, 100 percent power factor;

(2) the full load test is 100 percent of the meter current rating or test amperage, 100 percent power factor;

(3) the 50 percent factor is at 100 percent of the current rating or test amperes of the meter, 50 percent power factor with lagging current.

(b) The meter disk must complete at least

(1) one revolution during the light load test; and

(2) 10 revolutions during the full load test.

(c) A meter may not creep.

(d) Maximum tolerances for watthour meter are as follows:

TABLE (4)

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(e) The director will accept a manufacturer's certificate of accuracy for new single phase, single stator meters when the following conditions are met:

(1) the manufacturer must show primary tractability of its standards and acceptability of its test equipment and procedures to the NIST;

(2) the manufacturer must provide a meter test card or a valid certificate for each meter that it certifies to the utility;

(3) the meter test card must display the meter serial number and the results of the full load, light load, and 50 percent power factor test and must be available for inspection by the division; the procedures and accuracy requirements must be those described in this section.

(f) The division may test selected meters that are received by the utilities from the manufacturers to determine whether the meters meet the requirements of this section. Acceptance or rejection of a meter lot based on the sample test procedures will be determined by the division.

(g) The procedure in (e) of this section does not relieve the utility company of its responsibility for testing and assurance of accuracy as stated in 17 AAC 90.500, but will be accepted as a substitute by the division, if the utility desires to use the manufacturer's services and the manufacturer can meet the division's conditions.

(h) The division will provide testing assistance to utilities that do not have test equipment to ensure the accuracy of meters.

History: Eff. 1/18/2002, Register 161

Authority: AS 45.75.040

AS 45.75.050

AS 45.75.070

AS 45.75.080


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Last modified 7/05/2006