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

Question 1 / 2066636eed28f7522a1c51dd4f

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 20

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

the power circuit of the starter up to the load side of the overload relay heaters

the power circuit of the starter up to the load side of the main contacts

the power circuit of the starter up to the load side of the disconnect switch

the entire starter, including the power and control circuits, up to the load side of the disconnect switch

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Question 1 / 2066636eed28f7522a1c51dd4f

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?

Quick actions

— No credit card needed