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Electrical Systems 1 Exam 2 Study Guide Test.
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Electrical Systems 1 Exam 2 Study Guide Test. Standard Ratings for Transformers (written on back page of NEC) - CORRECT ANSWER 15, 30, 45 ,75, 122.5, 150, 225, 300, 500, 750, 1000 ALL IN KVA (apparent power) What are the 2 types of transformers? - CORRECT ANSWER Dry type and liquid filled...

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  • December 12, 2024
  • 12
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • electrical systems 1 exam 2 study guide test

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Electrical Systems 1 Exam 2 Study
Guide Test.
Standard Ratings for Transformers (written on back page of NEC) - CORRECT ANSWER 15, 30, 45 ,75,
122.5, 150, 225, 300, 500, 750, 1000

ALL IN KVA (apparent power)



What are the 2 types of transformers? - CORRECT ANSWER Dry type and liquid filled type



Dry type transformer - CORRECT ANSWER Commonly indoors and outdoors

For 480 - 208/120V transformers

Cooling medium is air



Liquid type tranformer - CORRECT ANSWER Used for higher voltages

Cooling medium is typically oil

Must have containment if indoors



What is the most common transformer in buildings? (we drew this in our notes pretty recently) -
CORRECT ANSWER 480V, 3 phase delta primary with a 208/120v 3 phase 4 wire wye secondary



Where can transformers be mounted? - CORRECT ANSWER Floor (needs 3.5" pad)

Wall

Suspended

Stacked

*75 KVA and smaller can be suspended or wall mounted*



If you have higher voltage, you have _____ amperage. - CORRECT ANSWER Lower



If you have lower voltage, you have _____ amperage. - CORRECT ANSWER Higher

, Rated primary/secondary current (Ip and Is) - CORRECT ANSWER Ip = (VA of xfrmr / primary voltage)

Is = (VA of xfrmr / secondary voltage)



What is the square footage range for having an electrical room on a floor? - CORRECT ANSWER 1
electrical room per every 25,000 - 30,000 SF



How many electrical rooms per floor would a 3 story, 300'x150' base plate need? - CORRECT ANSWER 2
electrical rooms per floor



Standard panelboard bus ratings (written on back page of NEC) - CORRECT ANSWER 100, 225, 250, 400,
600

All in amps



Standard distribution panel ratings (written on back page of NEC) - CORRECT ANSWER 400, 600, 800,
1000, 1200

All in amps



What tab do I look under in my NEC to figure out the different clearances and spacing for equipment
and room layout? - CORRECT ANSWER Working Clearances (110.26(A)(1) and the next couple pages
have helpful pictures)



What distance is always safe for clearance distance? - CORRECT ANSWER 4 feet (depends on voltage for
this distance but 4 feet is the max value and therefore always safe)



What tab do I look under in my NEC to figure out the difference dedicated space requirements? -
CORRECT ANSWER Working Clearances then flip a few pages forward to pg 43 (NEC 110.26 E)



What is the minimum distance to use for dedicated space? - CORRECT ANSWER 6 feet or to the
structural ceiling



Are transformers included in the requirements for dedicated spaces? - CORRECT ANSWER No

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