---
kind: "unit"
title: "30"
title_heading: "Mineral Resources"
key: "chI/subchB/part7/subpartJ"
level: "subpart"
label: "Subpart J"
heading: "Electric Motor Assemblies"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/30/chI-subchB-part7-subpartJ"
sections_count: 11
---

# Subpart J — Electric Motor Assemblies

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 › Part 7 — Testing by Applicant or Third Party

## Sections

- [§7.301. Purpose and effective date.](/cfr/30/7.301.md)
- [§7.302. Definitions.](/cfr/30/7.302.md)
- [§7.303. Application requirements.](/cfr/30/7.303.md)
- [§7.304. Technical requirements.](/cfr/30/7.304.md)
- [§7.305. Critical characteristics.](/cfr/30/7.305.md)
- [§7.306. Explosion tests.](/cfr/30/7.306.md)
- [§7.307. Static pressure test.](/cfr/30/7.307.md)
- [§7.308. Lockwasher equivalency test.](/cfr/30/7.308.md)
- [§7.309. Approval marking.](/cfr/30/7.309.md)
- [§7.310. Post-approval product audit.](/cfr/30/7.310.md)
- [§7.311. Approval checklist.](/cfr/30/7.311.md)