---
kind: "section"
citation: "30 C.F.R. § 19.9"
title: "30"
number: "19.9"
heading: "Performance."
url: "https://uscodex.org/cfr/30/19.9"
---

# §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.

## Notes

### Amendments

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

### Authority

Authority: 30 U.S.C. 957, 961. Secs. 19.1(b) and 19.7(a) also issued under 30 U.S.C. 811.

### Source

Source: Schedule 6D, 4 FR 4003, Sept. 21, 1939, unless otherwise noted.

### Amendments

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