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Re: Proper way to tap into 12VDC wire?
Rat Shack probably included two front panels because it takes up less inventory than two types of boxes. If you are installing switches or sockets in the box, aluminum is less likely to break when you tighten them down. Did you have to go to the "adult only" section in the back of the store to buy them? (G)
You might also want to put a couple of large zip ties on the wires just inside the box, next to the grommet. That makes them too wide to be pulled back out, ensures that anything tugging on the wire run can't pull something loose in the box. Cheap insurance.
"Real" wiring hardware has options to actually clamp the wires where they pass through, but finding that at Rat Shack, haha, not these days, except maybe for AC power cords.