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Does a 1200A switchboard require a separate fire rated room? Is a locked cage around the equipment adequate?

NEC 110-26 defines the dedicated electrical space as the width and depth of the equipment and extending from the floor to a height of 6ft above or to structure. I know this applies to panelboards, but does this apply to dry-type transformers, or can an hvac duct be routed over a transformer?

Is it a code violation to route conduit through ductwork?

what are the primary advantages to using non-fusible as opposed to fusible disconnects? (despite the cost)

what is meant by a "polyphase" motor?

Is there such a thing as 240V 3 phase? I thought 3 phase was only achievable at 208V??

We are in the process of having construction documents put together for a new 6,000 square foot Medical Office Building on our campus. We had planned on a 208V, 3-phase electrical service, however the x-ray machine we are planning to purchase is only available at 480V, 3-phase, wye...

The local inspector is telling us we need to replace a number of panels in our facility "due to the fire hazard with this equipment." Is anyone aware of this and able to offer any insight?

I am feeding a new panel in a building from an adjacent building through an underground sleeve we installed between the two buildings. The panelboard manufacturer is telling me I want the feeder to be series rated. What does this mean? Thanks.

what is the advantage of using 480v lighting versus 277v lighting? can i save any money on wiring? klubie