29 CFR Part 1926
§ 1926.408 — Special systems
OSHA 1926 · Subpart K — Electrical. Full current text with cross-references on BuildSpec.
§ 1926.408 Special systems. (a) Systems over 600 volts, nominal. Paragraphs (a)(1) through (a)(4) of this section contain general requirements for all circuits and equipment operated at over 600 volts. (1) Wiring methods for fixed installations—(i) Above ground. Above-ground conductors shall be installed in rigid metal conduit, in intermediate metal conduit, in cable trays, in cablebus, in other suitable raceways, or as open runs of metal-clad cable designed for the use and purpose. However, open runs of non-metallic-sheathed cable or of bare conductors or busbars may be installed in…
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