49 CFR § 236.529
Roadway element inductor; height and distance from rail
November 18, 2020
Inductor of the inert roadway element type shall be maintained with the inductor pole faces at a height above the plane of the tops of the rails, and with its inner edge at a hmrizontal distance from the gage side of the nearest running rail, in accordance with specifications of the carrier.
[49 FR 3386, Jan. 26, 1984]