# Vaults: Drainage and waterproofing.

**Citation:** 49 CFR 192.189  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(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 

## Document text

(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, NFPA-70 (incorporated by reference, see § 192.7).

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-76, 61 FR 26122, May 24, 1996; Amdt. 192-119, 80 FR 181, Jan. 5, 2015]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-192.189>
- Source ID: `ecfr`
- SHA-256: `eedb536719475718dc02e489e490cf80fcf78724dd79a6ab1403969e1dd40a23`
- Retrieved: 2026-08-20T05:54:34.435Z
- Exported: 2026-08-24T13:34:58.333Z
- Document slug: `49-cfr-192-189`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "192",
  "section": "192.189",
  "subpart": "Subpart D—Design of Pipeline Components",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```