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Florida Administrative Code (Last Updated: April 18, 2024) |
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25. Public Service Commission |
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D25. Departmental |
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25-6. Electric Service By Electric Public Utilities |
1(1) Average Meter Registration Error for Watthour Registers.
9(a) If the metering installation is used to measure a load which has practically constant characteristics, such as a street-lighting load, the meter shall be tested under similar conditions of load and the registration error of the meter “as found” shall be considered as the average meter error.
57(b) If a single-phase metering installation is used on a varying load, the average registration error shall be determined by one of the following methods. The utility shall select the method that best fits the customer’s usage pattern.
951. The weighted algebraic average of the error at approximately 10 percent and at 100 percent of the rated test amperes for the meter, the latter being given a weight of four times the former;
1302. The simple average of the error at approximately 10 percent and at approximately 100 percent of the rated test amperes of the meter, each being given an equal weight; or
1613. A single point, when calculating the error of an electronic meter, and the single point is an accurate representation of the error over the load range of the meter.
191(c) If a polyphase metering installation is used on a varying load, the average registration error shall be determined by one of the following methods. The utility shall select the method that best fits the customer’s usage pattern.
2291. The weighted algebraic average of its error at light load (approximately 10 percent rated test amperes) given a weight of two, its error at heavy load (approximately 100 percent rated test amperes) and 100 percent power factor given a weight of four, and at heavy load (approximately 100 percent rated test amperes) and 50 percent lagging power factor given a weight of one; or
2942. A single point, when calculating the error of an electronic meter, and the single point is an accurate representation of the error over the load range of the meter.
324(2) Average Meter Registration Error for Demand Registers.
332(a) For mechanical or lagged demand meters, registration error shall be determined by testing the meter at both 40 percent and 80 percent of its full-scale value, as read on the reference or standard meter, or as near to these two points as practicable. The following two formulas shall be used to estimate the kilowatt error of the meter at 25 percent of full scale and at 100 percent of full scale:
404E40525 406= [E40880 409– E41140412]/[R41380 414– R41640417]*[R41825 419– R42140422] + E42540
426E427100 428= [E43080 431– E43340434]/[R43580 436– R43840439]*[R440100 441– R44340444] + E44740
448where:
449R45025 451and R453100 454denote the kilowatt readings on the reference meter at 25 percent and 100 percent of the full scale value of the meter being tested, respectively;
479R48040 481and R48380 484denote the kilowatt readings on the reference meter at 40 percent and 80 percent of the full scale value of the meter being tested, respectively;
509E51040 511is the difference in kilowatts between the reference reading (R52140522) and the reading on the meter being tested;
531E53280 533is the difference in kilowatts between the reference reading (R54380544) and the reading on the meter being tested;
553E55425 555is the estimated kilowatt error corresponding to R56325; 564and
565E566100 567is the estimated kilowatt error corresponding to R575100576.
577The greater of these two estimated kilowatt errors, E58625 587or E589100, 590shall be expressed as a percentage of the full-scale value of the meter being tested to determine if the meter meets the accuracy requirement of paragraph 61625-6.052(3)(a), 617F.A.C.
618(b) For electronic demand meters, demand registration need not be separately tested provided the meter has been inspected to contain the correct demand algorithm whenever watthour registration is tested.
647Rulemaking Authority 649366.05(1) FS. 651Law Implemented 653366.05(3) FS. 655History–New 7-29-69, Formerly 25-6.58, Amended 5-19-97, 7-3-06, 10-27-14.
