26401-20 - Load Calculations Feeders and Services Exam Questions
And Accurate Answers Graded A+
What NEC Article covers feeder circuits? - Answer NEC Article 215
The conductors and equipment for delivering electric energy from the serving utility to
the wiring system of the premises served is a? - Answer Service
The overhead conductors between the utility electric supply system and the service point
is _____? - Answer Service drop
What sections make up electrical Calculations? - Answer Feeders, Services, & Branch
Circuits
What NEC Article covers the loads supplied as continuous duty? - Answer 215.2(A)(1)(a)
Which NEC article discusses the adjustment factors for above 3 current carrying
conductors in a raceway? - Answer 310.15(C)(1)
Which NEC article discusses the correction factors for the ambient temperature the
conductors will traverse? - Answer 310.15(B)(1)
Which article of the NEC addresses the non-compulsory requirement of upsizing
conductor size when voltage drop over 3% for feeders and over 5% for combination
feeder & branch circuits? - Answer 215.2(A)(1)(b) Informational Note No. 2
A continuous duty load is a load that operates without interruption for more than
______hours straight? - Answer 3
, When figuring voltage drop, in what table in the code book would you find conductor
resistance? - Answer NEC Chapter 9, Table 8
In what NEC table can you find allowable ampacities for insulated conductors which are
rated up to and including 2,000V - Answer 310.16
How do you calculate the load center length? Answer Multiply each tap load by its
physical routing distance from the supply add product of these together and divide them
by sum of the individual loads (total load I) producing load centre length (L)
What do you do when sizing amperage of a circuit but the wire is rated at 75 degree C and
the lugs are rated at 60 degree C? - Answer Size ampacity off the 60-degree column
If a feeder is rated at _____ the 60-degree rating for the feeder conductor is used unless
all feeder components are rated higher temperature. - Answer Less than or equal to 100A
I = VA/V What does the formula above calculate? Answer Feeder ampacity for a
single-phase circuit
I = VA/ (VX1.732) What does the above formula calculate? Answer Feeder ampacity of a
3-phase circuit
VA, if known in KW what is it multiplied by? -Answer 1,000
If overcurrent protection is installed where on the tap conductor is it? -Answer Ahead of
the point of supply
Which of the following is TRUE with respect to the 10' tap rule? - Answer Tap conductors
cannot extend beyond the switchboard, panelboard or control device it supplies
Which of the following is TRUE with respect to the 25' tap rule - Answer Must be rated no
less than 1/3 the capacity of the device protecting the feeder
And Accurate Answers Graded A+
What NEC Article covers feeder circuits? - Answer NEC Article 215
The conductors and equipment for delivering electric energy from the serving utility to
the wiring system of the premises served is a? - Answer Service
The overhead conductors between the utility electric supply system and the service point
is _____? - Answer Service drop
What sections make up electrical Calculations? - Answer Feeders, Services, & Branch
Circuits
What NEC Article covers the loads supplied as continuous duty? - Answer 215.2(A)(1)(a)
Which NEC article discusses the adjustment factors for above 3 current carrying
conductors in a raceway? - Answer 310.15(C)(1)
Which NEC article discusses the correction factors for the ambient temperature the
conductors will traverse? - Answer 310.15(B)(1)
Which article of the NEC addresses the non-compulsory requirement of upsizing
conductor size when voltage drop over 3% for feeders and over 5% for combination
feeder & branch circuits? - Answer 215.2(A)(1)(b) Informational Note No. 2
A continuous duty load is a load that operates without interruption for more than
______hours straight? - Answer 3
, When figuring voltage drop, in what table in the code book would you find conductor
resistance? - Answer NEC Chapter 9, Table 8
In what NEC table can you find allowable ampacities for insulated conductors which are
rated up to and including 2,000V - Answer 310.16
How do you calculate the load center length? Answer Multiply each tap load by its
physical routing distance from the supply add product of these together and divide them
by sum of the individual loads (total load I) producing load centre length (L)
What do you do when sizing amperage of a circuit but the wire is rated at 75 degree C and
the lugs are rated at 60 degree C? - Answer Size ampacity off the 60-degree column
If a feeder is rated at _____ the 60-degree rating for the feeder conductor is used unless
all feeder components are rated higher temperature. - Answer Less than or equal to 100A
I = VA/V What does the formula above calculate? Answer Feeder ampacity for a
single-phase circuit
I = VA/ (VX1.732) What does the above formula calculate? Answer Feeder ampacity of a
3-phase circuit
VA, if known in KW what is it multiplied by? -Answer 1,000
If overcurrent protection is installed where on the tap conductor is it? -Answer Ahead of
the point of supply
Which of the following is TRUE with respect to the 10' tap rule? - Answer Tap conductors
cannot extend beyond the switchboard, panelboard or control device it supplies
Which of the following is TRUE with respect to the 25' tap rule - Answer Must be rated no
less than 1/3 the capacity of the device protecting the feeder
