Revision of code for electric meters

The Code for Electric Meters, approved as an American Standard by the A. E. S. C. in 1922, covers many phases of electric metering practise. It includes specifications for the test and acceptance of types of watthour and demand meters with their accessory devices, such as currentand voltage transformers and shunts, and recommendations on installation, maintenance, and meter testing methods. This code is the basis of American practise in the manufacture of electricity meters, and their use, test, and maintenance by public utility operators. Approval tests of types of meters by public utility commissions are based on the code, and therules for periodic meter testing formulated by state commissions are in accordance with its general provisions.