20:25:03:02Membership classes.

One-call members are divided into three classes. A member that falls into more than one class is considered a member in only the higher class. The membership classes are as follows, with Class A as the highest class: (1) Class A: (a) Operators of intrastate gas transmission pipelines, interstate gas transmission pipelines, liquid pipelines, and interstate telecommunications companies; (b) Operators issuing 10,000 customer bills or more per billing cycle; (2) Class B: (a) Operators issuing more than 5,000 customer bills per billing cycle, but less than 10,000 bills per billing cycle; (3) Class C: (a) Operators issuing 5,000 customer bills or less per billing cycle; (b) All other operators not covered in Class A or Class B.

Source: 21 SDR 27, effective August 21, 1994; 24 SDR 30, effective September 14, 1997.