As shown in the illustration, which of the...

Question 1 of 2707066636eed28f7522a1c51db57

As shown in the illustration, which of the following pieces of equipment is supplied with a circuit breaker providing both overload and short-circuit protection? Illustration EL-0165

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Question 1 of 27070

As shown in the illustration, which of the following pieces of equipment is supplied with a circuit breaker providing both overload and short-circuit protection? Illustration EL-0165

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🔍 Key Concepts

• Difference between overload protection and short-circuit protection in motor circuits • How circuit breakers with dual ratings (e.g., AT / AF) are shown on one‑line diagrams • The role of motor starters/overload relays (LVP/LVR) versus breakers in protecting equipment

💭 Think About

• For each piece of equipment, trace its feeder from the bus and note every protective device shown on that branch. Which branch shows only a breaker symbol and no separate overload relay or starter? • Ask yourself: on which load must the breaker itself provide both overload and short‑circuit protection because there is no other device that could provide overload protection? • Compare the labels (e.g., 75AT/100AF, 150AT/225AF, 60AT/100AF, 40AT/100AF). How does this information help you identify which breaker is intended to carry and trip at the full‑load current of the equipment?

✅ Before You Answer

• Verify which loads have an LVP or LVR motor starter box indicated between the breaker and the motor, and which load does not. • Confirm that the device labeled with AT/AF on the branch you pick is the only protective device for that equipment (no separate overload relay shown). • Make sure the equipment you choose is the one whose breaker rating (AT) most closely matches the power rating (HP or kW) shown for that load, supporting that it handles both overload and short‑circuit protection.