Grounding of sub-transmission insulator bases

[stevenal]

Please see thread 483294

I cannot believe I asked about this 24 years ago. A little more than idle curiosity today as I'm looking into a specific event. Consider a wooden H-frame structure. 69 kV three wire on suspension insulators hanging from the upper crossarm, 12470 four wire on the arm below. No static line. Practice is to ground the distribution neutral at every structure, so every structure has a pole ground. Would you run the ground up and out the upper crossarm to bond the 69 kV insulator bases? Why or why not? Thanks.

 

[waross]

Yes I would ground the bases.
Leakage current through insulator bases has conducted through damp wood and caused cross arm fires.

 

[stevenal]

I fixed the link above.

Waross,
Thanks for the feedback. Shouldn't we be bonding the distribution post insulator bases as well then? I note that in the linked thread, Bacon4life spoke of bonding to prevent fire at much higher voltage and tighter spacing.