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<br />3. A solid copper conductor, insulated, covered, or bare, not smaller than No.8 <br /> <br />4. Rigid metal conduit or intermediate metal conduit of brass or other identified corrosion- <br />resistant metal conduit <br /> <br />Structural reinforcing steel or the walls of bolted or welded metal pool structures shall be <br />permitted as a common bonding grid for nonelectrical parts where connections can be made in <br />accordance with Section 250-8. <br />