Equipotential bonding conductor size

1) Except as permitted by Subrule 2), the size of an equipotential bonding conductor shall be not smaller than

a) No. 6 AWG if of copper; or
b) No. 4 AWG if of aluminum.

2) The size of an equipotential bonding conductor installed as concealed wiring and mechanically protected shall be permitted to be a minimum No. 10 AWG copper or No. 8 AWG aluminum.

Source: Rule 10-708, CSA C22.1:21, Canadian Electrical Code, Part 1 (25th Edition), Safety Standard for Electrical Installations. © 2021 Canadian Standards Association. Please visit store.csagroup.org