Load Calculations and Service Entrance Flashcards
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Which NEC article covers service conductors and equipment for electrical services?
Answer: Article 230
NEC Article 230 covers service conductors and service entrance equipment including disconnecting means and overcurrent protection.
Per NEC Table 220.12, what is the general lighting load volt-ampere value per square foot for commercial office buildings?
Answer: 3.5 VA per sq ft
NEC Table 220.12 assigns a general lighting load of 3.5 VA per square foot for office buildings used in branch circuit and feeder calculations.
What is the minimum number of 20-ampere small appliance branch circuits required in a residential kitchen per NEC 210.11(C)(1)?
Answer: Two 20A circuits
NEC 210.11(C)(1) mandates a minimum of two 20-ampere small appliance branch circuits to serve receptacle outlets in kitchen areas.
Per NEC Table 220.42, what demand factor applies to the first 3,000 VA of residential lighting load?
Answer: 100%
NEC Table 220.42 specifies a 100% demand factor for the first 3,000 VA of residential lighting load; demand factors drop for additional load.
What is the minimum ampere rating for service entrance equipment in a new single-family dwelling per NEC 230.79(C)?
Answer: 100 amperes
NEC 230.79(C) requires that the service disconnecting means for a single-family dwelling be rated at not less than 100 amperes.
When sizing a feeder supplying multiple motors, how is the largest motor's FLA factored into the load calculation per NEC 430.24?
Answer: Added at 125% of its FLA
NEC 430.24 requires that the largest motor's FLA be included at 125% when calculating the total feeder load for a group of motors.