Transformers Level II Lesson 4: Understanding Transformer Overcurrent Protection (22 Questions; Third Year)

Transformers Level II Lesson 4: Understanding Transformer Overcurrent Protection (22 Questions; Third Year)
Question 1: The National Electrical Code® (NEC)
requirements found in Section 450.3 are for the protection of
?
CORRECT ANSWER: The windings of the transformer only
Question 2: Where primary-only protection for transformers
is provided with rated currents of nine amperes or more, the
basic rule requires that each transformer rated 1,000 volts,
nominal, or less be protected by an individual overcurrent
protective device on the primary side, rated or set at not more
than ? of the rated transformer primary current.
CORRECT ANSWER: 125%. Table 450.3(B)
Question 3: For an installation with a 25-kVA, 3-phase
transformer, a 440-volt primary, and a 120-volt secondary,
calculate the maximum overcurrent protection value (not the
standard fuse or circuit breaker rating) using the protection
method for primary-only protection. (Round the final answer
to two decimal places.)
CORRECT ANSWER: 41.05 A

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