As shown in figure "B" of the illustration,...

Question 1 / 205eccefa3bacbc34ba4d47e62

Question 1 of 205eccefa3bacbc34ba4d47e62

As shown in figure "B" of the illustration, after the high voltage circuit has been properly de-energized and isolated, and tested for the absence of voltage, what is the proper sequence for grounding high voltage motor terminals prior to commencing work? See illustration EL-0158.

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🔍 Key Concepts

• High voltage grounding safety – which point must be safely grounded to the ship’s hull before touching any energized parts? • Current path on a fault – if the motor terminals unexpectedly become energized while you are installing grounds, where do you want that current to go first? • Difference between common hull ground and motor terminal connections in the diagram (figure B).

💭 Think About

• Look at figure B: if a fault occurs while you are still in the process of making connections, which part being connected first will give you a safe, low‑resistance path back to the hull? • Think about the principle: when applying grounds, do you want the ‘earth/hull’ side established first or last, and why? • If you reversed the intended safe order, what extra risk would that create for anyone touching the motor terminals or clamps?

✅ Before You Answer

• Verify which lead in the drawing represents the common hull ground and which ones go to the high voltage motor terminals. • Ask yourself: which connection must be made first to ensure any accidental voltage has a direct path to hull? • Eliminate any options that say the sequence doesn’t matter or that everything is done simultaneously, because high‑voltage safety procedures are very specific about order.

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Question 1 of 20

the motor terminal connections to the common ground connection should be made first and the common hull ground connection to the common ground connection should be made last

the common hull ground connection to the common ground connection should be made first and the motor terminal connections to the common ground connection should be made last

the common hull ground and the motor terminal connections should all be made to the common ground connection simultaneously

Question 1 / 205eccefa3bacbc34ba4d47e62

Question 1 of 205eccefa3bacbc34ba4d47e62

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Question 1 of 20

5eccefa3bacbc34ba4d47e62

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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