[Code of Federal Regulations]

[Title 30, Volume 1]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 30CFR18.42]



[Page 108]

 

                       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.