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Today’s automation industry quiz question comes from ISA’s course, Electrical Controls for the Control Systems Technician (TI23). This course focuses on electrical controls that are frequently overlooked in a formal training program. It is geared toward any level technician who wants a thorough review of electrical process concepts to reinforce their knowledge of basic electricity and develop skills required to install and maintain electrical control devices. The next class starts Dec. 7.
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The phase difference between each phase in a three-phase system is which of the following?
a) 180 degrees
b) 120 degrees
c) 270 degrees
d) 90 degrees
e) none of the above
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Here’s the answer to today’s quiz from the instructor for ISA’s December course offering, Electrical Controls for the Control Systems Technician (TI23).
The three phases of three-phase power are electrically separated by 120 degrees. In the case of 480 volt three-phase the voltage is approximately 477 VAC across any two legs when connected in a “Y” configuration. Three-phase power provides more constant power due to a constant differential.
The correct answer is B.
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