18 C.F.R. § 154.103 Composition of tariff.
Title 18 - Conservation of Power and Water Resources
(a) The tariff must contain sections, in the following order: A table of contents, a preliminary statement, a map of the system, currently effective rates, composition of rate schedules, general terms and conditions, form of service agreement, and an index of customers. (b) Rate schedules must be grouped according to class and numbered serially within each group, using letters before the serial number to indicate the class of service. For example: FT–1, FT–2 may be used for firm transportation service; IT–1, IT–2 may be used for interruptible transportation service; X–1, X–2 may be used for schedules for which special exception has been obtained.
Title 18: Conservation of Power and Water Resources
PART 154—RATE SCHEDULES AND TARIFFS
Subpart B—Form and Composition of Tariff
§ 154.103 Composition of tariff.

