Final answer:
The recommended allowable voltage drop for a branch circuit depends on the percentage voltage drop in the service wires.
Step-by-step explanation:
The recommended allowable voltage drop for a branch circuit (wires) depends on the percentage voltage drop in the service wires. If there is a 2% voltage drop in the service wires, the recommended allowable voltage drop for the branch circuit would typically be lower than 2%. This is because the total voltage drop from the source to the end of the branch circuit should not exceed a certain percentage to ensure proper functioning of the appliances connected to the circuit.