structures of overhead conductors over 600v.

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Structures of _______ shall be provided for support of overhead conductors over 600 volts.

a. concrete
b. metal
c. wood
d. any of these.

Code reference please!

** I found that "vegetation can not be used as support" HOWEVER, it doesn't clarify volts or any other info. ANY DIRECTION AND/OR actual code reference would be greatly appreciated!
 
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