1910.303 - General Requirements
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303(a) - The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in Sec. 1910.399.
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303(g)(2)(i) - Except as required or permitted elsewhere in this subpart, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by approved cabinets or other forms of approved enclosures, or by any of the following means:
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