---
kind: "section"
citation: "30 C.F.R. § 77.805"
title: "30"
number: "77.805"
heading: "Cable couplers and connection boxes; minimum design requirements."
url: "https://uscodex.org/cfr/30/77.805"
---

# §77.805. Cable couplers and connection boxes; minimum design requirements.

- (a)
  - (1) Couplers that are used in medium- or high-voltage power circuits shall be of the three-phase type and enclosed in a full metallic shell, except that the Secretary may permit, under such guidelines as he may prescribe, no less effective couplers constructed of materials other than metal.
  - (2) Cable couplers shall be adequate for the intended current and voltage.
  - (3) Cable couplers with any metal exposed shall be grounded to the ground conductor in the cable.
  - (4) Couplers shall be constructed to cause the ground check continuity conductor to break first and the ground conductor last when being uncoupled when pilot check circuits are used.
- (b) Cable connection boxes shall be of substantial construction and designed to guard all energized parts from personal contact.

## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 36 FR 9364, May 22, 1971, unless otherwise noted.