49 C.F.R. § 192.189 Vaults: Drainage and waterproofing.
Title 49 - Transportation
(a) Each vault must be designed so as to minimize the entrance of water. (b) A vault containing gas piping may not be connected by means of a drain connection to any other underground structure. (c) Electrical equipment in vaults must conform to the applicable requirements of Class 1, Group D, of the National Electrical Code, ANSI/NFPA 70. [35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192–76, 61 FR 26122, May 24, 1996]
Title 49: Transportation
PART 192—TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS
Subpart D—Design of Pipeline Components
§ 192.189 Vaults: Drainage and waterproofing.
