20:10:39:29Use

of a voltmeter to conduct the cow contact test. When using a voltmeter to measure voltage between contact points where 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.