In part 1 of this 4 part short video series, we will help you understand the complicated process of copper bussing your chrome tank properly. General rule : The diameter of the copper should be 1 sq in for each 1,000 amps carried. If the rectifier is more than 20 ft from the plating tank you may need thicker copper. Contact Plating International for more information! Info@PlatingInternational.com