Sure, each gantry comprises two columns and one pole.
Since string insulators and live parts terminate to the pole, one (who has to be familiar with the hazardous area) can go up the column an change the lamp.
I would like to know how can I size the insulation level for both primary and secondary neutral bushings of a solidly grounded 400/132/20 KV Ynyn0d11 power transformer.
Regards
Massoud