NESC Rule 320 B5 and Above-Ground Gas Lines

Merry Christmas
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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