['Specialized Industries']

['Mining']

07/19/2025

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§18.29 Access openings and covers, including unused lead-entrance holes.

...

§18.29 Access openings and covers, including unused lead-entrance holes.

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

(a) Access openings in explosion-proof enclosures will be permitted only where necessary for maintenance of internal parts such as motor brushes and fuses.

(b) Covers for access openings shall meet the same requirements as any other part of an enclosure except that threaded covers shall be secured against loosening, preferably with screws having heads requiring a special tool. (See Figure 1 in Appendix II.)

(c) Holes in enclosures that are provided for lead entrances but which are not in use shall be closed with metal plugs secured by spot welding, brazing, or equivalent. (See Figure 10 in Appendix II.)

['Specialized Industries']

['Mining']

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