C22.3 NO. 4-1974 (R2020)
Control of Electrochemical Corrosion of Underground Metallic Structures
This is the third edition of C22.3 No. 4, it supersedes previous editions published in 1936 and 1958.
The provisions of this Standard, forming a part of the Canadian Electrical Code, Part III, embody the applicable principles and general practices where underground metallic structures are subject to the risk of electro-chemical corrosion.
This Standard is issued for the guidance of all parties owning, controlling, or operating grounded electric systems and subsurface structures such as metallic pipes, metallic cable sheaths, or other structures with underground metallic components.