If you’d like to see updated information on this topic, please check out these more recently published articles: Brushing Up on Class 1 Circuit Requirements and Class 2 Circuit Requirements. Note: ...

Fig. 1. Firestop requirements for Class 1, 2, and 3 circuits are outlined in Sec. 725.3(B) and 300.21. Let’s take a quick look at the types of circuits involved: • A remote-control circuit controls ...

To draw an accurate circuit diagram, follow these steps: Step 1 - Draw the circuit symbols. Step 2 - Draw all the wires to connect the symbols together. Use a ruler and do not let the wires cross ...