(a)Adequate means appropriate and sufficient, as determined by
mutual agreement of the manufacturer, operators, and MSHA.
(b)Approval means official notification by letter, from MSHA to a
responsible organization, stating that the device under consideration has
been judged to meet the requirements of this part.
(c)Normal operation means the performance by each part of the device
of those functions for which the part was designed.
(d)Permissible as used in this part means completely assembled and
conforming in every respect with the design formally approved by MSHA under
this part. (Approvals under this part are given only to equipment for use in
gassy and dusty mines.)
(e)Protected means effectively covered, enclosed, or otherwise
guarded by adequate covers.
(f)Signaling device. As used in this part, a signaling device is one
that gives visual or audible signals.
(g)MESA means the United States Department of the Interior, Mining
Enforcement and Safety Administration. Predecessor orgainzation to MSHA,
prior to March 9, 1978.
(h)MSHA means the U.S. Department of Labor, Mine Safety and Health
Note: Paragraph (f) of this section is issued under the authority of §
101 of the Federal Mine Safety and Health
Act of 1977, Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 (30
U.S.C. 811). All other paragraphs in this section continue under the original
[Sched. 9B, 4 FR 1555, Apr. 11, 1939, as amended by Supp. 1, 20 FR 2975, May
4, 1955; 39 FR 24001, June 28, 1974; 43 FR 12315, Mar. 24, 1978; 47 FR 11370,
Mar. 16, 1982]
U.S. Department of Labor | Mine Safety and Health Administration (MSHA) | 1100 Wilson Boulevard, 21st Floor | Arlington, VA 22209-3939 www.msha.gov | Telephone: (202) 693-9400 | Fax-on-demand: (202) 693-9401