[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: 30CFR19.6]



[Page 132]

 

                       TITLE 30--MINERAL RESOURCES

 

  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR

 

PART 19_ELECTRIC CAP LAMPS--Table of Contents

 

Sec.  19.6  Specific requirements for approval.



    (a) Design. In the determination of the adequacy of the lamp, with 

respect to design, the following points will be considered: (1) The 

materials used; (2) construction; (3) weight; (4) amount of light; (5) 

distribution of light; and (6) exclusion of dust from the headpiece. The 

suitability of the materials and the construction shall be determined by 

preliminary inspection, by dropping tests, \1\ by durability tests of 

the cord and cord armor, \2\ and by the general behavior of the lamp 

equipment during the investigation. The amount and distribution of the 

light shall be judged both by observation of the illumination on a white 

screen and by photometric measurements.

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    \1\ Batteries are dropped 3 feet, at least 20 times onto an oak 

floor. Headpieces are dropped 6 feet, at least 20 times, onto concrete.

    \2\ Ten cords, assembled with the cord armor and outlet of the lamp 

with which it is to be used, are slatted at least 100,000 times through 

an arc of 50 degrees at approximately 90 slattings per minute.

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    (b) Angle of light beam. MSHA recommends that the angle of the light 

beam be at least 130 degrees horizontally to insure that the contrast 

edge of the beam is away from the more sensitive sector of the wearer's 

vision; however, to allow for manufacturing and assembly tolerances and 

the use of multiple filament bulbs, MSHA will approve lamps giving a 

minimum beam angle of 120 degrees. If the bulb has more than one major 

filament, the one giving the smaller angle will be used in the 

determination.

    (c) Light distribution, visual. Excepting special headpieces for 

inspection purposes, the area illuminated by the beam shall be free from 

sharp gradations in light intensity and spectral shadows.

    (d) Light distribution, photometric. (1) Excepting special 

headpieces for inspection purposes, the maximum candlepower of the light 

beam shall not be greater than 25 times the average or mean candlepower 

of the beam. \3\

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    \3\ The minimum allowable angle of 120 degrees will be used in 

determining the mean candlepower of the beam.

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    (2) The minimum candlepower of the beam based upon readings at the 

design voltage of the bulb shall not be less than 1.