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20.50.06.00.htm 20.50.06.00. Title 20 PUBLIC SERVICE COMMISSION Subtitle 50 SERVICE SUPPLIED BY ELECTRIC COMPANIES Chapter 06 Inspections and Tests Authority: Public Utilities Article, §2-121, 5-101, 7-301, and 7-302, Annotated Code of Maryland
20.50.06.01.htm 20.50.06.01. 01 Meter Shop.. A. Meter Shop.. 1) A utility shall maintain its own meter shop or use an outside meter shop, including one operated by a meter manufacturer, for testing, inspecting, or repairing a meter.2) A meter shop used by a utility for testing, inspecting, or repairing meters shall be approved by the Commission and be open for inspection upon request by an authorized representative of the Commission during normal business hours.B. Available Voltage. Each meter shop shall have a
20.50.06.02.htm 20.50.06.02. 02 Standard Watt-Hour Meters.. A. Requirements. Each utility shall have the following standard watt-hour meters for the purposes indicated:1) Secondary Standard. Each utility shall have at least one portable secondary standard watt-hour meter to be used to check the accuracy of the working standard watt-hour meters.2) Working Standard. Each utility shall have at least one portable working standard watt-hour meter to be used to check the accuracy of watt-hour meters.
20.50.06.03.htm 20.50.06.03. 03 Test Procedures and Accuracies.. A. Procedure. The following procedures shall apply to the testing and adjusting of meters and associated devices:1) General. The test of any unit of metering equipment shall consist of a comparison of its accuracy with the accuracy of a standard.2) Adjusted to Zero. All meters and associated devices, when tested, shall be adjusted as closely as practicable to the condition of zero error.3) Use of Tolerances. All tolerances are to be int
20.50.06.04.htm 20.50.06.04. 04 Preinstallation Inspections and Tests.. A. Authorization by Commission. A meter may be installed for use for revenue-billing purposes if it meets the following conditions:1) Approved Type. Its type and design meet the requirements of COMAR 20.50.02.02.. 2) Accuracy. The registration of the meter is within the tolerances specified in Regulation .03 of this chapter. A representative of the Commission will check the condition of meters in the meter shop of the utility from time
20.50.06.05.htm 20.50.06.05. 05 Post-Installation Inspections.. Post-installation inspections on new or upgraded service installations which incorporate instrument transformers to determine proper operation and wiring connections shall be made within 60 days after installation by a qualified person who shall be someone other than the original installer.
20.50.06.06.htm 20.50.06.06. 06 Request Tests.. A. Request For Test.. 1) Upon request by a customer and at no charge, the utility shall test the accuracy of the meter serving the customer.2) A utility may not perform a customer-requested meter test more than once during an 18-month period.3) A customer-requested test may be performed at:. a) The metering location;. b) The utility's meter shop; or. c) An approved meter shop.. B. Customer May Observe. The customer, or his representative, may be presen
20.50.06.07.htm 20.50.06.07. 07 Referee Tests.. A. Application for Test. Upon written application to the Commission by a customer or a utility, a test will be made of the customer's meter as soon as practicable by a representative of the Commission.B. Deposit for Test. The application shall be accompanied by a deposit as indicated below:. 1) Watt-hour meter - $10;. 2) Combination watt-hour and demand meter - $20.. C. Notice to Utility. On receipt of the request from a customer, the Commis
20.50.06.08.htm 20.50.06.08. 08 As Found Tests.. Each meter shall be tested before the meter is adjusted or repaired..
20.50.06.09.htm 20.50.06.09. 09 In-Service Performance Tests.. A. Test Program. In-service performance tests shall be made in accordance with the requirements of COMAR 20.50.02.02.B. Location of Tests. In-service performance tests may be made on the customer's premises, in the utility's meter shop, or in an approved meter shop.C. Tests for Other Purposes. Tests, such as request or referee tests, which are made for purposes other than to determine the in-service performance of a group of meters, may
20.50.06.10.htm 20.50.06.10. 10 Instrument Transformer Tests.. A. Preinstallation Test. All instrument transformers used for billing purposes shall conform to the requirements of Regulation .03E of this chapter before being placed in service.B. Current Transformers. Current transformers should be tested with a suitable variable burden device to determine if the windings of the secondary circuit have developed an open circuit, short circuit, or unwanted grounds.C. Potential Transformers. Potential transformers
20.50.06.11.htm 20.50.06.11. 11 Generating Station Meter Tests.. Generator output watt meters and watt-hour meters in the utility's generating station shall be tested according to a suitable schedule by comparison with the utility's standards but may not exceed the appropriate test intervals as required under COMAR 20.50.02.02.
20.50.06.9999.htm 20.50.06.9999. Administrative History Effective date: May 22, 1942 (Order No. 38330). Chapter revised effective May 18, 1960 (Order No. 54348). Chapter revised effective June 1, 1965 (Order No. 55819). Regulations .04A and .07F amended effective October 1, 1967 (Order No. 56893). Regulation .04 amended effective January 23, 1981 (8:2 Md. R. 117). Regulation .07B amended effective September 2, 1991 (18:17 Md. R. 1921) ―. Chapter revised effective June 2, 1997 (24:11 Md. R. 795).
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