The Canadian Standards Association (CSA, www.csa.ca) has published CSA C22.2 No. 126. 1-09, providing technical requirements for metal cable tray systems.  It is also available from the National Electrical Manufacturers Association (NEMA) as VE 1-2009, “Metal Cable Tray Systems”.

It is the third edition of the standard, superseding the second edition
published in 2002. Revision include changes to the fill-depth section
and requirements for load testing for wire mesh. The load class
designation table was also split into separate tables for Canada and
the U.S.

The standard can be purchased online at www.shopcsa.ca.