How does power enter the monorail?
Through a power feed adapter. A power feed adapter is a two-piece assembly that clamps around the rail and energizes conductors. It is included in all surface mount transformers. Powers feed canopies cover a junction box and are used with remote transformers. There are wall mount, cable mount and ceiling mount canopies. The power feed also provides a point of support for the rail, and can be placed at any point along the rail.