According to its nameplate, a power...

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Question 1 of 205eccefa4bacbc34ba4d48596

According to its nameplate, a power transformer has Class F insulation and is rated for 40°C ambient temperature. According to 46 CFR, Subchapter J (Electrical Engineering) what would be the maximum winding temperature allowable as taken by the resistance method?

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🔍 Key Concepts

• Class F insulation system temperature rating and what that number represents • How ambient temperature and temperature rise are combined to get maximum winding temperature • Adjustment (if any) required when using the resistance method instead of a direct thermometer reading, per 46 CFR Subchapter J

💭 Think About

• What is the standard total temperature limit (in °C) associated with Class F insulation systems? • If the transformer is rated for 40°C ambient, what temperature rise does that allow before the insulation limit is reached? • Does 46 CFR specify an extra margin or correction when the temperature is measured by the resistance method rather than by thermometer, and how does that change the final number?

✅ Before You Answer

• Look up the table in 46 CFR Subchapter J that lists maximum temperature rises for different insulation classes and measurement methods • Confirm the total allowable temperature for Class F insulation (not just the rise) • Verify whether the resistance method limit is higher or lower than the thermometer method for the same insulation class and ambient temperature

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