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30 pole mount transformers
2 ea High-Voltage bushings per transformer (allows you to make it either a Single or Three Phase Transformer depending on wiring)
2 ea of five different kinds of insulators per transformer
Choosing Single or Three Phase and voltage depends on what the service supplies - residential, commercial or industrial. This is all explained in – Wiring Utility Pole Transformers
Once you determine the type of transfomer you can then use - Single-Phase Transformer Wiring or Three-Phase Transformer Wiring to correctly wire the transformers. (this will also dictate the quanity and placement of insulators)
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