GroundRules
30 CFR 18.24: Electrical clearances.
Where this section sits in the code
- Title 30—Mineral Resources
- CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
- SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS
- PART 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES
- Subpart B—Construction and Design Requirements
Minimum clearances between uninsulated electrical conductor surfaces, or between uninsulated conductor surfaces and grounded metal surfaces, within the enclosure shall be as follows:
Minimum Clearances Between Uninsulated Surfaces
Phase-to-Phase Voltage (rms) Clearances (inches)
Phase-to-Phase Phase-to-Ground or Control Circuit
0 to 250 0.25 0.25
251 to 600 0.28 0.25
601 to 1000 0.61 0.25
1001 to 2400 1.4 0.6
2401 to 4160 3.0 1.4
Collected 2026-08-27T02:25:24Z. Source file · JSON