When splitting the secondary protection into multiple devices, which articles' conditions must be satisfied?

When splitting the secondary protection into multiple devices, which articles' conditions must be satisfied?

• A. 110 and 70
• B. 240 and 408
• C. 450 and 695
• D. 200 and 240

Answer: (B)

When you split secondary protection into multiple devices, you have to meet the rules that govern both overcurrent protection and the proper use of panelboards or distribution equipment. This means you must comply with Article 240, which covers how overcurrent protection is sized, coordinated, and applied to feeders and conductors, ensuring each portion of the circuit is protected appropriately. It also means you must satisfy Article 408, which sets the requirements for panelboards and similar distribution equipment—their construction, listing, and how multiple branch-circuit devices can be arranged inside them. Together these two areas ensure that the protection scheme is safe and properly integrated into the equipment layout: the overcurrent devices must provide correct protection for the conductors (Article 240), and the panelboard setup that houses those devices must be allowed and correctly installed according to its own rules (Article 408). Other article areas don’t cover both aspects simultaneously, so both sets of conditions must be satisfied.

When you split secondary protection into multiple devices, you have to meet the rules that govern both overcurrent protection and the proper use of panelboards or distribution equipment. This means you must comply with Article 240, which covers how overcurrent protection is sized, coordinated, and applied to feeders and conductors, ensuring each portion of the circuit is protected appropriately. It also means you must satisfy Article 408, which sets the requirements for panelboards and similar distribution equipment—their construction, listing, and how multiple branch-circuit devices can be arranged inside them.

Together these two areas ensure that the protection scheme is safe and properly integrated into the equipment layout: the overcurrent devices must provide correct protection for the conductors (Article 240), and the panelboard setup that houses those devices must be allowed and correctly installed according to its own rules (Article 408). Other article areas don’t cover both aspects simultaneously, so both sets of conditions must be satisfied.