ANSI C12。9-2014涵盖了变压器额定功率电表与仪表变压器一起使用时的电表测试开关的尺寸和功能。它还增加了与测试开关一起使用的测试插孔的规格。这些附加装置确保与符合本标准的开关一起使用的测试插孔能够正确、安全地工作。

ANSI C12.9-2014 covers the dimensions and functions of meter test switches for transformer-rated watthour meters when used in conjunction with instrument transformers. It also adds specifications for test jacks used in conjunction with the test switches. These additions ensure that test jacks used in conjunction with switches meeting this standard will operate properly and safely.