Appendix B Rule 10-604

Supplementary bonding is required for service entrance equipment as the supply authority side conductors are considered unprotected. Once past the main protective devices, standard bonding
methods apply.

Source: Appendix B Rule 10-604, CSA C22.1:21, Canadian Electrical Code, Part 1 (25th Edition), Safety Standard for Electrical Installations. © 2021 Canadian Standards Association. Please visit