PC Load Calculations and Service Entrance

Question 1

Which NEC article covers service conductors and equipment for electrical services?

Accepted Answer

Article 230

Answer

NEC Article 230 covers service conductors and service entrance equipment including disconnecting means and overcurrent protection.

Question 2

Per NEC Table 220.12, what is the general lighting load volt-ampere value per square foot for commercial office buildings?

Accepted Answer

3.5 VA per sq ft

Answer

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.

Question 3

What is the minimum number of 20-ampere small appliance branch circuits required in a residential kitchen per NEC 210.11(C)(1)?

Accepted Answer

Two 20A circuits

Answer

NEC 210.11(C)(1) mandates a minimum of two 20-ampere small appliance branch circuits to serve receptacle outlets in kitchen areas.

Question 4

Per NEC Table 220.42, what demand factor applies to the first 3,000 VA of residential lighting load?

Accepted Answer

100%

Answer

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.

Question 5

What is the minimum ampere rating for service entrance equipment in a new single-family dwelling per NEC 230.79(C)?

Accepted Answer

100 amperes

Answer

NEC 230.79(C) requires that the service disconnecting means for a single-family dwelling be rated at not less than 100 amperes.

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