---
kind: "unit"
title: "30"
title_heading: "Mineral Resources"
key: "chI/subchB/part23"
level: "part"
label: "Part 23"
heading: "Telephones and Signaling Devices"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/30/chI-subchB-part23"
sections_count: 14
---

# Part 23 — Telephones and Signaling Devices

Title 30 C.F.R. — Mineral Resources › Chapter I — Mine Safety and Health Administration, Department of Labor › Subchapter B — Testing, Evaluation, and Approval of Mining Products

## Sections

- [§23.1. Purpose.](/cfr/30/23.1.md)
- [§23.2. Definitions.](/cfr/30/23.2.md)
- [§23.3. Application procedures and requirements.](/cfr/30/23.3.md)
- [§23.4. Reserved](/cfr/30/23.4.md)
- [§23.5. Conditions governing investigations.](/cfr/30/23.5.md)
- [§23.6. General requirements for approval.](/cfr/30/23.6.md)
- [§23.7. Specific requirements for approval.](/cfr/30/23.7.md)
- [§23.8. Inspection and tests.](/cfr/30/23.8.md)
- [§23.9. Special requirements for complete devices.](/cfr/30/23.9.md)
- [§23.10. Material required for MSHA records.](/cfr/30/23.10.md)
- [§23.11. How approvals are granted.](/cfr/30/23.11.md)
- [§23.12. Wording, purpose, and use of approval plate.](/cfr/30/23.12.md)
- [§23.13. Withdrawal of approval.](/cfr/30/23.13.md)
- [§23.14. Instructions for handling future changes in design.](/cfr/30/23.14.md)