---
kind: "section"
citation: "30 C.F.R. § 18.42"
title: "30"
number: "18.42"
heading: "Explosion-proof distribution boxes."
url: "https://uscodex.org/cfr/30/18.42"
---

# §18.42. Explosion-proof distribution boxes.

- (a) A cable passing through an outside wall(s) of a distribution box shall be conducted either through a packing gland or an interlocked plug and receptacle.
- (b) Short-circuit protection shall be provided for each branch circuit connected to a distribution box. The current-carrying capacity of the specified connector shall be compatible with the automatic circuit-interrupting device.
- (c) Each branch receptacle shall be plainly and permanently marked to indicate its current-carrying capacity and each receptacle shall be such that it will accommodate only an appropriate plug.
- (d) Provision shall be made to relieve mechanical strain on all connectors to distribution boxes.

## Notes

### Authority

Authority: 30 U.S.C. 957, 961.

### Source

Source: 33 FR 4660, Mar. 19, 1968, unless otherwise noted.