(225 ILCS 705/15.02) (from Ch. 96 1/2, par. 1502)
Sec. 15.02.
Air lines shall be grounded at the compressor and, if practicable, at other low-resistance ground connections. Air lines shall not be connected to tracks, water lines, or other electric-power return conductors.
(Source: Laws 1953, p. 701.)