In three-phase transformer connections, the primary leads are labeled with the letter _____ and the secondary leads are labeled with the letter _____.

A. X; H
B. H; X
C. L; X
D. X; L


Answer: B

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The IRC requires a heating unit to be installed in any residence built in an area where the winter design temperature is below ____°F.

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A. 78 B. 1.98 C. 15.62 D. 19.8

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Answer the following statement true (T) or false (F)

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