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Question 1 of 205eccefa4bacbc34ba4d482c4

Utilizing the instructions and data provided in the illustration, what size overload relay heater would be the proper selection for a motor with the nameplate data shown? Assume the motor operates at sea level and that the motor and its starter share the same ambient temperature. Illustration EL-0171

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🔍 Key Concepts

• Using the motor nameplate full-load amps to start your selection • Applying Chart A – Variations by Operating Conditions based on service factor and ambient temperature • Finding the correct heater in Table 24 – NEMA Size 6, three overload relays per starter, by matching the current range

💭 Think About

• From the motor nameplate, what is the full-load current (AMPS), and what is the service factor and ambient temperature rating? • Given that the motor and starter are in the same ambient temperature and the motor has that service factor, does Chart A tell you to adjust the heater size up, down, or not at all? • Once you know there is (or isn’t) an adjustment, which heater catalog number in Table 24 has a current range that actually contains the motor’s full-load current?

✅ Before You Answer

• Confirm the motor’s full-load current (AMPS), service factor, and ambient temperature directly from the nameplate on the illustration. • Verify in Chart A which row applies to a 1.15 service factor, 40°C rise, with the same ambient at motor and starter. • Check that the chosen heater catalog number’s Min–Max motor current range in Table 24 actually brackets the nameplate full-load current, with no adjustment needed.

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