['Specialized Industries']

['Mining']

07/19/2025

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§18.24 Electrical clearances.

...

§18.24 Electrical clearances.

RegSense CFR Regulations Mining Specialized Industries CFR Section English Focus Area USA

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 Surface Clearances
Phase-to-Phase Voltage (rms)	Clearances (inches)
Phase-to-Phase Voltage (rms)	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

['Specialized Industries']

['Mining']

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