30 CFR § 18.24 - Electrical clearances.

---
identifier: "/us/cfr/t30/s18.24"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 18.24 - Electrical clearances."
title_number: 30
title_name: "Mineral Resources"
section_number: "18.24"
section_name: "Electrical clearances."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "B"
subchapter_name: "TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS"
part_number: "18"
part_name: "ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 957, 961."
regulatory_source: "33 FR 4660, Mar. 19, 1968, unless otherwise noted."
cfr_part: "18"
---


# 18.24 Electrical clearances.

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

|  |  |  |
| --- | --- | --- |
| 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 |

[57 FR 61209, Dec. 23, 1992]