As shown in figures "E" and "F" of the...

Question 1 / 270705eccefa4bacbc34ba4d48309

Question 1 of 270705eccefa4bacbc34ba4d48309

As shown in figures "E" and "F" of the pictured high voltage rack mounted circuit breaker, what figure represents the circuit breaker position when in the test position for testing the various shunt trips? See illustration EL-0167.

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🔍 Key Concepts

• Relationship between main contacts and auxiliary contacts in a draw‑out breaker • What must be energized to test shunt trips without energizing the bus • How the breaker’s position in the cubicle changes between connected, test, disconnected, and withdrawn

💭 Think About

• Look at diagrams A–D and decide in which one the main power contacts are clearly not connected to the bus, but the control/auxiliary contacts still can be used for testing. • Compare where the wheels of the breaker sit relative to the front and rear of the switchboard/cubicle and imagine how far it must rack in to engage only control circuits. • Think about safety: in which position can you safely test shunt trips without putting the feeder fully on the live bus?

✅ Before You Answer

• Verify which figure shows main contacts open/not engaged with the bus bars. • Verify which figure still shows auxiliary contacts connected so that control power and trip circuits can operate. • Confirm that the figure you choose would allow the breaker to be inside the cubicle (for safety interlocks) but not actually carrying load current on the main contacts.

Question 1 of 27070

Question 1 / 270705eccefa4bacbc34ba4d48309

Question 1 of 270705eccefa4bacbc34ba4d48309

Back

Question 1 of 27070

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