Electrical Level 3 Module 1 Load Calculations and Branch Feeder Circuits

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?
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)?
225%
Conductors must be derated when installed in conduit
on or above rooftops
Continuous loads are calculated at what percentage of the maximum current rating of
the overcurrent device?
80%
For a given load and length, the branch circuit voltage drop should not exceed
3%
For resistance welders, the rating for the overcurrent protection device should not
exceed what percentage of the primary current rating of the welder?
300%
We have an expert-written solution to this problem!
Show window lighting is calculated at 200VA per linear foot plus
125%
The allowable ampacity for eleven No. 12 THHN copper conductors in a cable must be
adjusted by
50%
The load for 10' of multi-outlet assembly used to supply several loads simultaneously is
1,800VA
The maximum size dual-element fuse for a 40hp, 3Ø, 460V motor with a Design Letter
D is
100A
What is the demand load for one household range with a nameplate rating of 11.75kW,
240V, 1Ø?
8kW
What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit
run through an ambient temperature of 38°C?
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
13.75A

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