20:10:39:30Use

of a milliammeter to conduct the cow contact test. When using an in-line milliammeter or a clamp-around milliammeter to measure current between contact points and one of those points is the floor surface or earth, a metal plate must make a high-quality conductive contact with the floor surface or earth, using the procedures described in § 20:10:39:31.

Source: 42 SDR 174, effective June 21, 2016.