bman- If I read correctly your original post said you were dealing with a panelboard:
Got a 75KVA 480V xfmr needing to go in a tight spot. Q- clearance in 110.26 151-600v . Got my xfmr sitting across an aisle from a branch panel, the top of xfmr housing is some distance lower elevation than the bottom of branch panel with nothing on wall below panel , therefore this would not be a condition 3?(exposed on both sides) I’m supposing the key phase in 110.26 (1) is "in the direction of live parts" Also is there anything to prohibit mounting a disconnect on side of Xfmr if disc is supplied by said xfmr and meets clearance requirements?
so the work space of the panelboard must be provided including the depth. The transformer only needs to have clearances specified by the manufacturer and is not required to meet 110.26. I would expect that there should be access to the transformer for servicing however.
[This message has been edited by George Little (edited 08-02-2006).]
