Licensed Electrical Contractor Load Calculation and Services Questions and Answers Flashcards
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Read the first 6 Licensed Electrical Contractor Load Calculation and Services Questions and Answers flashcards as text
When performing a standard load calculation for a single-family dwelling per NEC Article 220, what is the general lighting load allowance per square foot?
Answer: 3 VA per square foot
The NEC specifies a general lighting load of 3 VA per square foot for dwelling units.
What is the demand factor applied to the first 10 kVA of general lighting and receptacle loads in a dwelling unit calculation?
Answer: 100%
The first 10 kVA of general lighting and receptacle loads is calculated at 100% demand factor per NEC Table 220.42.
A 200-amp residential service uses a split-bus panel. How many main disconnect throws are permitted maximum?
Answer: 6
NEC 230.71 permits a maximum of six switches or circuit breakers to serve as the service disconnecting means.
When calculating dryer load for a multifamily dwelling with 15 dryers, what demand factor applies per NEC Table 220.54?
Answer: 47%
For 15 dryers, NEC Table 220.54 specifies a demand factor of 47%.
What minimum service size does the NEC require for a single-family dwelling?
Answer: 100 amperes
NEC 230.79(C) requires a minimum 100-ampere service for single-family dwellings.
In a commercial load calculation, what demand factor is applied to the first 12.5 kVA of general lighting for an office building?
Answer: 100%
NEC Table 220.42 requires the first 12.5 kVA of general lighting load to be calculated at 100% for commercial occupancies.