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

Question 1 / 270705eccefa4bacbc34ba4d48392

Question 1 of 270705eccefa4bacbc34ba4d48392

As shown in figure "A" of the illustration, what statement is true concerning the door interlock? See illustration EL-0172.

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Question 1 of 27070

As shown in figure "A" of the illustration, what statement is true concerning the door interlock? See illustration EL-0172.

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

🔍 Key Concepts

• Door interlock purpose in medium‑voltage switchgear (protecting personnel from exposed live parts) • Relationship between door position (open/closed) and disconnect switch position (open/closed) • Fail‑safe design: what positions are allowed when access to live equipment is possible

💭 Think About

• When the door is open, should the disconnect switch be allowed to energize the compartment? Think about personnel safety. • When the disconnect switch is closed (energized), should you be able to open the door and expose the bus bars? Why or why not? • Which answer choice describes a typical safety interlock that prevents access to live parts AND prevents energizing when the door is open?

✅ Before You Answer

• Make sure the correct choice prevents the door from opening when the disconnect is closed (energized). • Make sure the correct choice also prevents the disconnect from being closed when the door is open. • Eliminate any option that would allow the compartment to be energized with the door open, or the door to be opened while everything is still energized.

Question 1 of 27070

As shown in figure "A" of the illustration, what statement is true concerning the door interlock? See illustration EL-0172.

The door cannot be opened unless the disconnect switch is open, and if the door is open the disconnect switch cannot be opened.

The door cannot be opened unless the disconnect switch is closed and if the door is open the disconnect switch cannot be opened.

The door cannot be opened unless the disconnect switch is open, and if the door is open the disconnect switch cannot be closed.

The door cannot be opened unless the disconnect switch is closed and if the door is open the disconnect switch cannot be closed.

Question 1 / 270705eccefa4bacbc34ba4d48392

Question 1 of 270705eccefa4bacbc34ba4d48392

As shown in figure "A" of the illustration, what statement is true concerning the door interlock? See illustration EL-0172.

Back

Question 1 of 27070

As shown in figure "A" of the illustration, what statement is true concerning the door interlock? See illustration EL-0172.

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