TABLE 6.—Estimated Percentage of Meters of Various Sizes in Use. TABLE 7.-Summary of Tests of Watthour Meters Made by Operating Company as Required by Rules of the Public Utilities Commission, District of Columbia. TABLE 8.-Summary of Tests of Watthour Meters Made Under the Supervision of the Public Utilities Commission of the District of Columbia. Found creeping. More than 4 per More than 4 per Years. Meters Between 4 per cent fast and 4 per cent slow. Number. Per cent. Number. Per cent. Number. Per cent. Number. Per cent. TABLE 9.-Intervals in Months for the Periodic Testing of Meter as Required by Commission Rules. [Periods are given in months. Starred periods (*) are for meters as per requirements of Meter Code, types being mentioned in the State rules.] Single and polyphase meters over 100 kw. on 2,000 volts and over 6 months. • Same as for single-phase meters. Each electric meter shall be tested at least once a year. Single and polyphase meters up to 100 kw. on 2,000 volts and over, 12 months. "No meter shall be in service longer than 3 years without being tested. Oregon.. Pennsylvania. South Carolina. Washington 7. West Virginia. Wisconsin. 1 Each service meter shall be tested at least once in two years. Same as for self-contained types. TABLE 10.-Voltage Regulation Requirements in Commission Rules. Within 5 per cent plus or minus. Total variation not to exceed 10 per cent minimum to maximum. Not to exceed 8 per cent. Not to exceed 10 per cent.. At any time. 'Applicable to utilities selling more than 50,000 kilowatt hours annually or having more than 50 consumers. Applicable to all other utilities. 'Applicable only in towns of more than 1,500 population. TABLE 11.—Comparative Summary of Commercial and Municipal Plants, 1917. (From Census of Electric Industries, 1917-Central Electric Light and Power Station.] Total income. $2,933, 016, 941 $127, 375, 200 95.8 4.2 Sale of current for light, heat, and power, including free service. $526, 894, 240 $486, 634, 021 $40, 260, 219 92.4 7.6 $502, 059, 980 $24, 834, 260 $462, 473, 917 $39, 586, 063 92.1 7.9 $24, 160, 104 $674, 156 97.3 2.7 In addition to salaries and wages, includes the cost of supplies and materials used for ordinary repairs and replacements, advertising, fuel, mechanical power, electrical energy purchased, taxes, charges for depreciation and charges for sinking fund, and all other expenses incident to operation and maintenance. Resales not deducted. Figures not complete for commercial plants. 94, 679 10,862 89.7 10.3 10,387 3,408 75.3 24.7 12,077,657 859,098 93.4 6.6 3,437 74.4 25.6 582, 463 93.5 6.5 1,231,858, 488 96.0 4.0 1,039, 320, 089 95.9 4.1 |