Due to the location of the sign (at the end of a run of about a dozen or more light poles)it is a great deal easier to install the transformer than to run a new ckt. There is already a conduit at the sign from the last pole (about 20' away). Installing a new ckt. would entail multiple pulls through each handhole of each pole. And the panel is about 300 ft. away.
My main concern is whether or not this application of the transformer is acceptable, assuming all fusing, grounding, and disconnecting requirements are observed.