Appendix B Rule 12-506
Specific requirements pertaining to materials suitable as thermal barriers can be found in Article 3.1.5.11 of the National Building Code of Canada.
Source: Appendix B Rule 12-506, 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