[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR18.42]

[Page 102]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 18--ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES--Table of Contents
 
             Subpart B--Construction and Design Requirements
 
Sec. 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.