When using the test set-up shown in figure...

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Question 1 of 2066636eed28f7522a1c51dd4f

When using the test set-up shown in figure "A" of the illustration, besides the motor windings and the motor feeder cable, what circuit components are actually being meggered? Illustration EL-0027

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Question 1 of 20

66636eed28f7522a1c51dd4f

When using the test set-up shown in figure "A" of the illustration, besides the motor windings and the motor feeder cable, what circuit components are actually being meggered? Illustration EL-0027

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🔍 Key Concepts

• Follow the megohmmeter L lead connection from the motor terminals back through the starter power circuit in figure "A". • Notice which devices are open and which are closed (disconnect switch blades, main starter contacts, and overload relay heaters). • Remember that the megger only tests components that are electrically continuous with its test lead; open contacts stop the test voltage from going farther.

💭 Think About

• Starting at T1–T3 in the illustration, what components (heaters, contacts, wiring) are on the same side of any open switches as the megger lead? • Does the megger ever connect into the control circuit (start/stop pushbuttons, coil M), or is it limited to the three-phase power circuit? • Upstream, where does the first effective insulation break occur that prevents the megger voltage from reaching the ship’s power system?

✅ Before You Answer

• Verify exactly where the disconnect switch is open and decide whether its line side or load side is being tested. • Check whether the main power contacts of the starter are shown open or closed in figure "A"—this determines how far the megger voltage travels. • Confirm that the control wiring and coil are not tied to T1–T3 for this test, so they are either fully included or fully excluded.

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Question 1 of 2066636eed28f7522a1c51dd4f

When using the test set-up shown in figure "A" of the illustration, besides the motor windings and the motor feeder cable, what circuit components are actually being meggered? Illustration EL-0027

Back

Question 1 of 20

66636eed28f7522a1c51dd4f

When using the test set-up shown in figure "A" of the illustration, besides the motor windings and the motor feeder cable, what circuit components are actually being meggered? Illustration EL-0027

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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