Wire them in parallel. Like this crappy pic shows lol.
The white wire is connected to the heat tape. Then the wire curves up to the next shelf and connects to that strip. Then you run another curve to the above shelf and just do that for as many shelves as you have. You can see that one white wire goes into the shakf and one comes out and goes to the next shelf. It's easy. At the end, instead of having another wire, just attach the plug. All 6 shelves of my rack are on one plug into my VE 200 thermostat.
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