All styles of class A circuits using physical conductors shall be installed such that the outgoing and return conductors exiting from and returning to the control unit, respectively, are routed separately. The outgoing and return circuit conductors may be installed in the same raceway.

All styles of class A circuits using physical conductors shall be installed such that the outgoing and return conductors exiting from and returning to the control unit, respectively, are routed separately. The outgoing and return circuit conductors may be installed in the same raceway.

• A. True
• B. Sometimes
• C. Not specified
• D. False

Answer: (D)

Class A circuits are built for fault tolerance, so the paths from the control unit and back to it must run on separate physical routes. If the outgoing and return conductors share the same raceway, a single damage event could affect both directions at once, undermining the circuit’s ability to maintain signaling or supervision. Because of this, the conductors should be routed separately and not placed in the same raceway. The statement is false because it implies that sharing a raceway is permissible, which it is not for Class A wiring. The requirement is clear: separate routing to preserve independence of the two directions.

Class A circuits are built for fault tolerance, so the paths from the control unit and back to it must run on separate physical routes. If the outgoing and return conductors share the same raceway, a single damage event could affect both directions at once, undermining the circuit’s ability to maintain signaling or supervision. Because of this, the conductors should be routed separately and not placed in the same raceway. The statement is false because it implies that sharing a raceway is permissible, which it is not for Class A wiring. The requirement is clear: separate routing to preserve independence of the two directions.