You can't run heat tape in series. That would mean cutting the voltage to each section of heat tape. All heat tape and racks are wired in paralell, the only thing that changes is how sections are wired. Some people use seperate pugs for each section then plug them all into the same power strip, for example. Others (me included) wire them into one plug per rack. some use one long section of heat tape snaked back and forth through the rack, but I'm cheap and like to save the 6"-8" of tape per shelf.







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