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A set of questions and answers related to electrical engineering, specifically focusing on the national electrical code (nec) and its application to utilization equipment and branch circuits. It covers topics such as branch circuit ratings, overcurrent protection, load calculations, and voltage drop. Useful for students studying electrical engineering or those seeking to understand the nec.
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Utilization Equipment - Correct AnswersIs defined by NEC as an equipment that utilizes electrical energy. NEC Article 210 - Correct AnswersCovers branch circuits ( except for branch circuits that supplies only motor loads). NEC Article 210.2 - Correct AnswersProvides a listing of other code articles for specific- purpose branch circuits. NEC Article 210.3 - Correct AnswersBranch circuits are rated by the maximum rating or setting of thr overcurrent devices NEC Article 210.19 - Correct AnswersBranch circuit conductors are required to be sized with an ampacity rating that is no less than the Max. load to be carried Per NEC Article 240.4 - Correct AnswersBranch circuit overcurrent protection is required to have a rating or setting not exceeding the rating in this code for Conductors, NEC Article 240.3 - Correct AnswersFor Equipment, and NEC Article 210.21 - Correct AnswersFor Outlet devices including lampholders and receptacles NEC Article 430 - Correct AnswersApplies to branch circuit supplying only motor load NEC Article 440 - Correct AnswersApplies to branch circuits supplying only air conditioning equipment, refrigerating equipment, or both Noncontinuous Load - Correct AnswersAmpacity is 125% of the continuous load before the application of any adjustment or correction factor per NEC Section 210.19(A)
3VA/sq ft - Correct AnswersThe unit lighting load for a barber shop, and a store also 1/4 VA/sq ft - Correct AnswersThe unit lightng load for a warehouse Single-Phase Branch Circuit Max Load - Correct AnswersIs determined by multiplying the rating or setting of the overcurrent protection device (circuit breaker or fuse) by the circuit voltage MaxLoad =Amperage x Voltage Three-Phase Branch Circuit Max Load - Correct AnswersMax Load =Amperage x Voltage x 1.732 (Square Root of 3) 125% - Correct AnswersBranch Circuits may supply noncontinuous loads, continuous loads, or both. Per NEC Section 210.20(A), the branch circuit rating shall not be less than the noncontinuous load plus ______ of the continuous load Continuous load - Correct AnswersIs a load whose max current is expected to continue for 3 hours or more Continuous load - Correct AnswersAre loads that are calculated at 125% of the maximum current rating of the load 180VA - Correct AnswersPer NEC Section 220.14(I), each outlet is assigned a load of _______. NEC Chapter 9 Table - Correct AnswersResistance table for Solid Conductors Load Center Length (L) - Correct AnswersLoad1= Length1 x Load Amp Load2= Length2 x Load Amp Load3= Length3 x Load Amp Total Load = Load1 + Load2 + Load
NEC Sections 21 0.11(C) and 210.52(F) - Correct AnswersRequire the installation of at least one receptacle to supply laundry equipment NEC Sections 220.52(B) - Correct AnswersRequires that the feeder load be computed at 1,Load1= Length x Load Amp500VA for each laundry circuit