Commercial Occupancy General Purpose Receptacles Questions are often included on master and journeyman electrician exams.
How would you answer this question?
How many general purpose receptacles are required for a 10,000 square foot office building?
Step #1
Refer to NFPA 70 220.14 (K)(2) “Banks and Office Buildings” to determine what the minimum total receptacle load requirement is in volt-amps.
1 volt-amp/sq.ft. X 10,000 sq.ft. = 10,000 volt-amps required.
Step #2
Refer to NFPA 70 220.14 (I) “Receptacle Outlets” to determine the volt-amps rating per receptacle outlet.
The rating for receptacle outlets shall be calculated at not less than 180 volt-amps per outlet.
Step #3
Determine the number of receptacles required by dividing total minimum receptacle load in volt-amps by the rating per outlet.
10,000 volt-amps/180 volt-amps = 55.6 or 55 receptacles.
Did you know that whenever you are determining the number of receptacles if the calculation results in a remainder you round down and not up? To pass your exam you need to know not only how to find code references-you need and how they should be applied.
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