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The additional arm with (3) disconnects usually was seen with (3) transformers mounted on a pole, (3 phase) commercial service.  (3) Small transformer would be mounted on (2) additional cross arms.  More modern, heavy, transformers are mounted on a tri-bracket that still allows one side of the pole for climbing and service of equipment above the transformers.

From Norm Charbonneau's website.

Last edited by Mike CT

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