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Title 30: Mineral Resources
CHAPTER I: MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
SUBCHAPTER B: TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS
PART 23: TELEPHONES AND SIGNALING DEVICES
23.9 - Special requirements for complete devices.
Telephones and signaling devices will be considered nonpermissible if used under any of the followings conditions:
(a) Without the approval plate, mentioned hereafter.
(b) With unprotected openings in any of the explosion-proof compartments. This condition refers to any openings in these compartments, but especially to those equipped with removable covers.
(c) If not complete with all of the parts considered in the approval.
(d) If installed or connected otherwise than in accordance with the instructions furnished by the manufacturer.
(e) If modified in any manner not authorized by MSHA.
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