Load Calculations and Service Entrance Flashcards
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Read the first 6 Load Calculations and Service Entrance flashcards as text
Per NEC 220.14(I), what volt-ampere value is assigned to each single or duplex receptacle outlet for load calculation purposes?
Answer: 180 VA
NEC 220.14(I) assigns 180 VA to each single or duplex receptacle outlet when calculating branch circuit and feeder loads.
Which NEC table provides demand factors for household electric ranges and counter-mounted cooking units?
Answer: Table 220.55
NEC Table 220.55 provides demand factors and column notes for calculating feeder loads for household electric ranges, wall ovens, and counter-mounted cooking units.
What is the minimum clearance required between service entrance conductors and openable windows per NEC 230.9?
Answer: 3 feet
NEC 230.9 requires service conductors to maintain a minimum clearance of 3 feet from windows that are designed to be opened.
Which NEC table provides demand factors for commercial kitchen cooking equipment?
Answer: Table 220.56
NEC Table 220.56 provides demand factors for commercial electric cooking equipment; Table 220.55 is for residential cooking equipment.
Per NEC 230.24(B), what is the minimum clearance required for service drop conductors above public streets subject to truck traffic?
Answer: 18 feet
NEC 230.24(B) requires service drop conductors to maintain at least 18 feet of clearance above public streets, alleys, roads, and driveways subject to truck traffic.
Per NEC Table 310.15(C)(1), what ampacity correction factor applies when 4 to 6 current-carrying conductors are bundled in the same conduit?
Answer: 80% derating
NEC Table 310.15(C)(1) requires an 80% derating factor when 4 to 6 current-carrying conductors are installed in the same raceway or cable.