A building has a 120/240 high leg three phase service.
The contractor wants to install a delta-wye 240/480 volt x-fmr that will directly feed a piece of equipment (industrial lathe, in a commercial building).
I am not sure how far away the equipment will be from the x-fmr, but lets say more than 25 feet for this question.
First off, can this be done?
Looking at 240-21 (c)(2) and (3), over 25 feet would not be allowed.
But even if it is not over 10 feet 240-21(c)(2)(c) says the conductors must terminate at an enclosed switchboard, panelboard, or control device, or back of an open switch board. Is a fused disconnect a control device as used in this section?
If so, does the neutral need to go to the disconnect? To the machinery?
Does the secondary transformer winding need to be grounded to all available grounding electrodes on site? What size does it have to be.? (15KVA x-fmr)
