I am going to run a new circuit from my QO electrical panel to my laundry room for a dedicated freezer plug. The panel is located in my garage and appears to be drywalled in all the way.
Here is a picture of the panel from when the house was being framed; sadly I don't have anything closer up than this. The style of strain relief clamp is visible on the top:
If I cannot easily access the top of the panel (as it is behind the drywall) then are there strain relief clamps that meet code which can be inserted from the inside?
Google has not been forthcoming and I haven't tackled an electrical panel before.