Is it your contention that this is a "feeder" going out to the garage, and not a branch circuit(multiwire), because it is fed from a circuit breaker that is not the final overcurrent device. The final overcurrent device being the branch circuit breakers in the panel that's in the garage.
Branch Circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlets.
Russ
[This message has been edited by russ m (edited 01-28-2004).]