NESC Rule 320 B5 and Above-Ground Gas Lines

Location
Northeast
Occupation
Engineer
Hi everyone,

Does NESC Rule 320 B5 (12" spacing between steam, gas lines, etc) apply only to buried conduit? Given it's in Part 3 I assume it only applies to underground, but the definition of conduit in Rule 302 doesn't seem to only apply to underground conduit.

Is there an equivalent separation between supply & gas lines applicable to above ground conduit as well?
 
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