Electrical Level 3 Module 1 Load Calculations And
Branch Feeder Circuits – Questions & Answers
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? Right Ans - 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)? Right Ans - 225%
Conductors must be derated when installed in conduit Right Ans - on or
above rooftops
Continuous loads are calculated at what percentage of the maximum current
rating of the overcurrent device? Right Ans - 80%
For a given load and length, the branch circuit voltage drop should not exceed
Right Ans - 3%
For resistance welders, the rating for the overcurrent protection device
should not exceed what percentage of the primary current rating of the
welder? Right Ans - 300%
Show window lighting is calculated at 200VA per linear foot plus Right Ans
- 125%
The allowable ampacity for eleven No. 12 THHN copper conductors in a cable
must be adjusted by Right Ans - 50%
The load for 10' of multi-outlet assembly used to supply several loads
simultaneously is Right Ans - 1,800VA
The maximum size dual-element fuse for a 40hp, 3Ø, 460V motor with a
Design Letter D is Right Ans - 100A
What is the demand load for one household range with a nameplate rating of
11.75kW, 240V, 1Ø? Right Ans - 8kW
Branch Feeder Circuits – Questions & Answers
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? Right Ans - 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)? Right Ans - 225%
Conductors must be derated when installed in conduit Right Ans - on or
above rooftops
Continuous loads are calculated at what percentage of the maximum current
rating of the overcurrent device? Right Ans - 80%
For a given load and length, the branch circuit voltage drop should not exceed
Right Ans - 3%
For resistance welders, the rating for the overcurrent protection device
should not exceed what percentage of the primary current rating of the
welder? Right Ans - 300%
Show window lighting is calculated at 200VA per linear foot plus Right Ans
- 125%
The allowable ampacity for eleven No. 12 THHN copper conductors in a cable
must be adjusted by Right Ans - 50%
The load for 10' of multi-outlet assembly used to supply several loads
simultaneously is Right Ans - 1,800VA
The maximum size dual-element fuse for a 40hp, 3Ø, 460V motor with a
Design Letter D is Right Ans - 100A
What is the demand load for one household range with a nameplate rating of
11.75kW, 240V, 1Ø? Right Ans - 8kW
