Telephones and Signaling Devices

  1. Law
  2. CFR 30
  3. Mineral Resources
  4. Mine Safety and Health Administration, Department of Labor
  5. Testing, Evaluation, and Approval of Mining Products
  6. Telephones and Signaling Devices

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Section
23.1

Purpose.

Section
23.2

Definitions.

Section
23.3

Application procedures and requirements.

Section
23.4

§ 23.4 [Reserved]

Section
23.5

Conditions governing investigations.

Section
23.6

General requirements for approval.

Section
23.7

Specific requirements for approval.

Section
23.8

Inspection and tests.

Section
23.9

Special requirements for complete devices.

Section
23.10

Material required for MSHA records.

Section
23.11

How approvals are granted.

Section
23.12

Wording, purpose, and use of approval plate.

Section
23.13

Withdrawal of approval.

Section
23.14

Instructions for handling future changes in design.