As shown in figures "A" and "B" of the...

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Question 1 of 205eccefa4bacbc34ba4d48523

As shown in figures "A" and "B" of the illustration, the potable water pump trips out on overload shortly after each start attempt. In an attempt to troubleshoot the problem, the following voltage readings are taken during the brief run period: At load side of disconnect: L1 to L2 is 230 VAC L2 to L3 is 230 VAC L3 to L1 is 230 VAC At load side of contactor: T1 to T2 is 105 VAC T2 to T3 is 106 VAC T3 to T1 is 229 VAC At load side of overloads: T1 to T2 is 100 VAC T2 to T3 is 101 VAC T3 to T1 is 223 VAC What is most likely the problem? See illustration EL-0043.

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🔍 Key Concepts

• Compare the line-to-line voltages at each test point (disconnect load side, contactor load side, overload load side). • Trace the L2 phase path on the schematic and match it with the low voltage readings (around 100–106 VAC). • Think about how a high‑resistance connection vs. a motor winding fault would change voltages measured before the motor terminals.

💭 Think About

• Which pair of lines still shows a normal 230 VAC at the load side of the contactor and overloads, and what does that say about L1 and L3? • All three voltages are normal at the load side of the disconnect, but two readings drop to about half value at the load side of the contactor. What specific component is between those two test points on the suspect phase? • If the problem were inside the motor windings, would you expect the abnormal voltages to appear at the contactor/overload terminals, or only at the motor terminals when loaded?

✅ Before You Answer

• Verify exactly where each reading is taken: after the disconnect, after the contactor (M), and after the overloads (OL). • Confirm which phase (L1, L2, or L3) is common to the two low voltage readings at each test point; that is your suspect line. • Check whether the voltage drop gets much worse across any one device (disconnect, contactor, or overload) on that line; the device with the biggest drop is most likely at fault.

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