1. Scope 1.1 The symbols contained in this Standard are intended for those who
prepare or use electrical wiring and layout diagrams associated with
architecture and building construction. These symbols have purposely
been made simple and are not intended in any way to depict the
structure of the particular devices shown. 1.2 It is not the intention of this Standard to determine the size of the
particular symbols used on a drawing. They shall be drawn to a size
commensurate with the particular drawing being made. The size of wire
or conduit is not to be designated or implied by the symbol, although
the following factors are so intended: (a) Number of wires in a conduit; (b) use (branch circuit, feeder, auxiliary system); and (c) Location (ceiling, floor). Wire and conduit sizes shall be as designated in CSA Standard C22.1,
Canadian Electrical Code, Part I, and shall be marked on the drawings. 1.3 The symbols may be modified by upper-case letters and other
distinguishing marks placed in the centre and by subscript letters or
numbers placed at the lower right. Upper-case letters used as
subscripts shall refer to standard types. Numerals shall refer to
standard numerical variations. Lower-case letters used as subscripts
shall have a meaning varying with each drawing or set of drawings and
shall be explained in a key symbols accompanying the drawings. 1.4 Examples of special outlets and switches, designated by upper-case
letter identification beside the symbol, are: (a) Dust-tight - DT; (b) Explosion-proof - EP; (c) Rain-tight - RT; (d) Vapour-tight - VT; (e) Weatherproof - WP; (f) Recessed - R; (g) Undergrounded - UNG. 1.5 Drawings prepared using symbols from this Standard are intended to show
the physical location of the outlets and devices required, as well as
the location of the required wiring. Supplementary notes are to be
used where necessary. For clarity, separate drawing sheets may be used
for different systems in the same location, e.g., signal systems and
lighting systems may be shown separately.