ELECTRICAL LEVEL 3 MODULE 1 LOAD CALCULATIONS AND BRANCH FEEDER CIRCUITS

According to the NEC®, the ampacity of branch circuit conductors must be derated when there are more than how many current-carrying conductors in a raceway? - correct answer 3 Air conditioning overcurrent protective devices can never exceed what percentage of the motor-rated load current or the branch circuit selection current (whichever is greater)? - correct answer 225% Conductors must be derated when installed in conduit - correct answer on or above rooftops Continuous loads are calculated at what percentage of the maximum current rating of the overcurrent device? - correct answer 80% For a given load and length, the branch circuit voltage drop should not exceed - correct answer 3% For resistance welders, the rating for the overcurrent protection device should not exceed what percentage of the primary current rating of the welder? - correct answer 300% Show window lighting is calculated at 200VA per linear foot plus - correct answer 125% The allowable ampacity for eleven No. 12 THHN copper conductors in a cable must be adjusted by - correct answer 50% The load for 10' of multi-outlet assembly used to supply several loads simultaneously is - correct answer 1,800VA The maximum size dual-element fuse for a 40hp, 3Ø, 460V motor with a Design Letter D is - correct answer 100A What is the demand load for one household range with a nameplate rating of 11.75kW, 240V, 1Ø? - correct answer 8kW What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit run through an ambient temperature of 38°C? - correct answer 44 Amps What is the lighting load on a 120V circuit for six 100W incandescent lights and four fluorescent fixtures with a ballast rating of 1.5A, all operating continuously for 8 hours per day? 13.75A - correct answer 13.75A What is the load center distance for a 208V, four-wire, three-phase branch circuit with fixed noncontinuous loads from the source of 60A at 45', 40A at 60', 30A at 75', and 25A at 100' - correct answer 63.55' What is the load center length for a branch circuit consisting of noncontinuous loads of 125A at 80', 75A at 110', and 50A at 100'? - correct answer 93' What is the load center length for a branch circuit with noncontinuous loads of 20A at 60' and 50A at 125'? - correct answer 106.43' What is the load for 55' of show window using the linear foot method? - correct answer 13,750VA What is the motor full-load current for a motor with a nameplate rating of 50hp, 460V, 3Ø? - correct answer 65A What is the required circuit ampacity of a noncontinuous, single-phase load of 8.5kW at 277V? - correct answer 30.69A What is the required circuit ampacity for a noncontinuous, three-phase load of 6kW at 208V? - correct answer 16.65A What is the total ampacity for a 120V branch circuit consisting of four duplex receptacles rated noncontinuous duty and six duplex receptacles rated continuous duty? - correct answer 17.25A What is the total load required by the NEC® for two appliance branch circuits plus a laundry branch circuit? - correct answer 4,500VA What is the voltage drop for a 120V, single-phase, two-wire branch circuit, 100' long, using copper conductors of 6,530 circular mils with a noncontinuous load of 13A? 5.14V - correct answer 5.14V What size copper conductor would be required for a 240V, 1Ø circuit supplying a noncontinuous load of 27.5A at a distance of 145', and a maximum voltage drop of 3%? - correct answer No. 10 When connected to 15A or 20A multi-outlet general-purpose branch circuits, which of the following shall not exceed 50% of the branch circuit ampere rating? - correct answer Fastened-in-place utilization equipment