485. All transformers shall be kept inside a room with a door that is to be kept locked, unless they are inside a locked box that prevents any contact with a live component.
A transformer room installed on or after 1 April 1993 in which there are exposed live components shall be separated from the control panel section by a non-combustible partition.
O.C. 213-93, s. 485; Erratum, 1993 G.O. 2, 2603; O.C. 1236-98, s. 27.