[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: 30CFR19.9]

[Page 126]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 19--ELECTRIC CAP LAMPS--Table of Contents
 
Sec. 19.9  Performance.

    In addition to the general design and the safety features, MSHA 
considers that a lamp of permissible type should meet certain minimum 
requirements with respect to performance, as follows:
    (a) Time of burning and candlepower. Permissible electric cap lamps 
shall burn for at least 10 consecutive hours on one charge of the 
battery and shall give during that period a mean candlepower of light 
beam of not less than 1.
    (b) Bulb life. The average life of the bulbs shall be not less than 
200 hours, and at least 92 percent of the bulbs shall have a life of 150 
hours. The life of a bulb is the number of hours its main filament will 
burn in the cap lamp or its equivalent.
    The life of a bulb having main filaments in parallel is considered 
ended when the first filament ceases to burn; the life of a bulb having 
independent main filament is considered ended when the last filament 
ceases to burn.
    (c) Bulb uniformity. (1) The bulbs submitted shall meet the 
following minimum requirements for variation in current consumption and 
candlepower:
    (2) The current consumption of at least 94 percent of the bulbs 
shall not exceed the average current by more than 6 percent. The 
candlepower (s. cp.) of at least 90 percent of the bulbs shall not fall 
short of the average candlepower by more than 30 percent.
    (d) Corrosion of contacts. Battery terminals and leads therefrom, as 
well as the battery gas vents, shall be designed to minimize corrosion 
of the electrical contacts.

[Sched. 6D, 4 FR 4003, Sept. 21, 1939, as amended at 47 FR 11369, Mar. 
16, 1982]