You are in the process of replacing an...

Question 1 / 205eccefa4bacbc34ba4d4857c

Question 1 of 205eccefa4bacbc34ba4d4857c

You are in the process of replacing an ammeter in a generator control panel of an AC switchboard, and you notice that the current transformer secondary circuit is not fused. In accordance with 46 CFR, Subchapter J (Electrical Engineering), what should be your action?

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🔍 Key Concepts

• Current transformer (CT) secondary behavior when opened vs. shorted • 46 CFR Subchapter J requirements for protection of instrument circuits on generators • The safety reason behind not interrupting a CT secondary circuit under load

💭 Think About

• Think about what happens to voltage on a CT secondary if the circuit is suddenly opened while current is flowing in the primary. • Ask yourself whether adding fuses or breakers could ever create an unintended ‘open circuit’ in the CT secondary under fault or maintenance conditions. • Consider whether regulations prefer CT secondaries to be shorted or opened when they are not connected to meters/relays.

✅ Before You Answer

• Verify in 46 CFR Subchapter J whether overcurrent protection is permitted in CT secondary circuits feeding instruments. • Check if there is any explicit prohibition or warning about opening or fusing CT secondaries. • Confirm which condition is considered inherently safer for CT secondaries: always having a solid, unfused path, or one that might open under fault.

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Question 1 of 20

install a suitable fuse (for one line only) since this must have been missed during initial inspection

install two suitable fuses (one for each line) since this must have been missed during initial inspection

install a two pole circuit breaker in the secondary circuit

do nothing, as the secondary circuit of a current transformer must never be fused

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Question 1 / 205eccefa4bacbc34ba4d4857c

Question 1 of 205eccefa4bacbc34ba4d4857c

Back

Question 1 of 20

5eccefa4bacbc34ba4d4857c

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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