Commercial Service Load Calculations Flashcards

What is the unit lighting load per square foot for office occupancies per NEC Table 220.12?

Answer: 3.5 VA/sq ft

NEC Table 220.12 specifies 3.5 VA per square foot as the unit lighting load for office occupancies.

Per NEC 220.44, what demand factor applies to the portion of non-dwelling receptacle load that exceeds 10 kVA?

Answer: 50%

NEC 220.44 permits a 50% demand factor on non-dwelling receptacle loads exceeding the first 10 kVA.

What is the unit lighting load per square foot for a mercantile (retail store) occupancy per NEC Table 220.12?

Answer: 3.0 VA/sq ft

NEC Table 220.12 lists 3 VA per square foot as the unit lighting load for mercantile occupancies.

How many volt-amperes is assigned to each duplex receptacle outlet in a non-dwelling commercial occupancy per NEC 220.14(I)?

Answer: 180 VA

NEC 220.14(I) assigns 180 VA to each single or multiple receptacle on one yoke in non-dwelling occupancies.

For 'all other' commercial occupancies per NEC Table 220.42, what demand factor applies to lighting loads exceeding 50,000 VA?

Answer: 50%

NEC Table 220.42 allows a 50% demand factor on lighting loads over 50,000 VA for most commercial occupancies.

Which NEC article primarily governs branch circuit, feeder, and service load calculations for commercial buildings?

Answer: Article 220

NEC Article 220 specifically covers load calculation methods for branch circuits, feeders, and services.

A 25,000 sq ft office building is being permitted. What is the minimum general lighting load before applying any demand factors?

Answer: 87,500 VA

Office occupancies use 3.5 VA/sq ft per NEC Table 220.12, so 25,000 × 3.5 = 87,500 VA.