My existing service (circuit breaker) panel is installed on an outside wall of our garage. The garage is not completely finished, but its sheet rocked and taped which makes pulling in new circuits difficult. The easiest way to connect our new 50A spa circuit to the panel is to run PVC conduit up the outside of the garage wall and then through the wall using an LB connector into a knockout on the rear (back) of the service panel. Basically, the new circuit will come into one of the knockouts on the rear (back) of the service panel instead of using knockouts on the bottom, side, or top. Is this an acceptable way to bring the new circuit into the breaker panel (vs. coming in the top / bottom or sides)?