I'm relocating a battery in my son's Impreza (from the front to the back). I have to run the positive battery cable from the rear up to the front in order to power the electrics which need to be powered. To run the new cable, I want to use line clamps to provide support for the cable and so it will not rub on the frame and create a short circuit. For reference, here's what a line clamp looks like:
I want to ensure I'm doing it correctly, so my question is, How do you properly size the line clamp to what you are trying to support? In my case, the cable I'm running has a width of ~.41". I selected 1/2" clamps. What I'm worried about is whether the extra space left in the clamps will allow for wiggle room and cause abrasion to the cable. Should I have picked a smaller size which would stretch the clamp around the cable and hold it more firmly or would have that been a mistake? Is there a rule of thumb for selecting these regardless of the size of what is being supported?