Marking of equipment (see Appendix B)

1) Each piece of electrical equipment shall bear those of the following markings necessary to identify the equipment and ensure that it is suitable for the particular installation:

a) the maker’s name, trademark, or other recognized symbol of identification;
b) catalogue number or type;
c) voltage;
d) rated load amperes;
e) watts, volt amperes, or horsepower;
f) whether for ac, dc, or both;
g) number of phases;
h) frequency in hertz;
i) rated load speed in revolutions per minute;
j) designation of terminals;
k) whether for continuous or intermittent duty;
l) short-circuit current rating or withstand rating;
m) evidence of approval; or
n) other markings necessary to ensure safe and proper operation.

2) At the time of installation, each service box shall be marked in a conspicuous, legible, and permanent manner, to indicate clearly the maximum rating of the overcurrent device that may be used for this installation.

3) At each distribution point, circuit breakers, fuses, and switches shall be marked, adjacent thereto, in a conspicuous and legible manner to indicate clearly

a) which installation or portion of installation they protect or control; and
b) the maximum rating of overcurrent device that is permitted.

4) Where the maximum continuous load allowed on a fused switch or circuit breaker as determined in accordance with Rule 8-104 5) and 6) is less than the continuous operating marking of the fused switch or circuit breaker, a permanent, legible caution marking shall be field applied adjacent to the fused switch or circuit breaker nameplate to indicate the maximum continuous loading permitted for connection to the fused switch or circuit breaker.

5) The marking on electrical equipment shall not be added to, or changed, to indicate a use under this Code for which the equipment has not been approved.

Source: Rule 2-100, CSA C22.1:21, Canadian Electrical Code, Part 1 (25th Edition), Safety Standard for Electrical Installations. © 2021 Canadian Standards Association. Please visit