🔍 Key Concepts
• Compare the insulation resistance values shown (kΩ vs MΩ) and what they mean about a ground fault.
• Notice how conductors v and w are connected or disconnected between figures 3, 5 and 6.
• Think about how opening the switch and disconnecting one conductor should isolate which side of the circuit is grounded.
💭 Think About
• In figures 3 and 4, when v and w are tied together at the fixture, which test point shows the low resistance to ground, and what does that imply about where the fault might be?
• After the wire between v and the fixture is disconnected in figure 5, which conductor (v or w) still shows the low resistance reading, and which now shows a high resistance?
• If a conductor is truly clear of grounds, what insulation resistance range (kΩ vs MΩ) would you expect to see on the tester for that path?
✅ Before You Answer
• Identify which readings are very low (indicating a likely ground fault path) and which are very high (indicating good insulation).
• Track, step‑by‑step, whether the low-resistance reading stays with v, moves to w, or disappears as connections are changed.
• Before choosing, be sure you can say clearly: 'Conductor v is ___ of grounds' and 'Conductor w is ___ of grounds,' based only on the final test setup in figures 5 and 6.