7.3.4.3.Insulation of Support

(1) Where a hanger or support for copper tube or brass or copper pipe is of a material other than brass or copper, it shall
  be suitably separated and electrically insulated from the pipe or tube to prevent galvanic action.

  (2) Where a hanger or support for stainless steel pipe or tube is of a material other than stainless steel, it shall be
  suitably separated and electrically insulated from the pipe or tube.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.