As a matter of convenience, the illustrated...

Question 1 / 205eccefa4bacbc34ba4d483b2

Question 1 of 205eccefa4bacbc34ba4d483b2

As a matter of convenience, the illustrated test in figure "A" is being performed to determine whether or not the motor windings are grounded. In order for this megger test to be effective in detecting a ground, what condition must be met prior to conducting the test? See illustration EL-0027.

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🔍 Key Concepts

• How a megohmmeter (megger) detects a ground fault between motor windings and the equipment grounding system • The role of equipment bonding and continuity between the motor frame, starter enclosure, cable armor, and the ship’s hull • Why disconnecting a bonding conductor can prevent a megger from seeing a winding‑to‑ground fault

💭 Think About

• Look at where the megger leads are connected in illustration A. If a winding is shorted to the motor frame, how does that fault current (or test voltage) get back to the megger’s E terminal? • If the motor frame, starter enclosure, and cable armor were floating (not bonded to the hull), would the megger be able to show a ground fault to the ship’s hull? Why or why not? • Which choice would help create a solid return path for the megger test, and which choices would actually defeat the purpose of checking for a ground?

✅ Before You Answer

• Verify which components in the drawing are shown tied to the hull/earth symbol and how that relates to the megger’s E (earth) terminal. • Check whether a megger test for grounds should ever be done with the disconnect switch closed and power available—think about both safety and measurement accuracy. • Identify which option ensures continuous bonding between the motor frame, cable armor, starter enclosure, and hull, so any winding‑to‑frame fault will be seen by the megger.

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Question 1 of 20

the disconnect switch must be closed and power available to the starter

the motor starter enclosure equipment ground bonding cable should be disconnected

the motor starter enclosure, the motor feeder cable armor, and the motor frame must have a path of continuity and be bonded to the hull

the motor frame equipment bonding cable must be disconnected

Question 1 / 205eccefa4bacbc34ba4d483b2

Question 1 of 205eccefa4bacbc34ba4d483b2

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Question 1 of 20

5eccefa4bacbc34ba4d483b2

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💭 Think About

✅ Before You Answer

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