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Master Electrician Questions & Answers 100%Correct!!
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    Master Electrician Questions & Answers 100%Correct!!

  • A 150 kVA service transformer has a 480Y/277 volt 3-phase primary and a 208Y/120 volt, 3-phase secondary. What is the approximate full-load ampere rating of the primary of the transformer? - ANSWER180 amperes A 50 kVA transformer with a 480-volt, 3-phase, primary and a 208Y/120 volt, 3-phase secondary is to be installed. Overcurrent protection is required on both primary and secondary sides of the transformer. Determine the MAXIMUM standard size overcurrent protection device permitted on the ...
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