Hevi-Bar II, 600 Amp Tandem Standard Collector With Shoe. 42" Long Pigtails, 2 AWG, are Supplied on the Collector. The 600 Amp Tandem Collector has an Additional Tension Spring on the Arm Versus the 400 Amp Tandem Collector. Customer Supplied Wiring Connects to the Collector Pigtail With in-Line Connectors. USED ONLY ON 700 - 1500 AMP CONDUTOR BAR. Do Not Use Single Collectors if Expansion Sections, Radio Controls, or Transfers Exist on the System.