Exam (elaborations)
Ch. 8 - Feeder Load Calculations And Insulation: Qs & As
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Ch. 8 - Feeder Load Calculations And Insulation: Qs & As
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Ch. 8 - Feeder Load Calculations And Insulation: Qs &As
____________ are the part of the electrical system that connect the branch-circuit
panelboards to the electrical service equipment. Right Ans - Feeders
Conductors from on-site generators and transformers are also feeders, not
____________. Right Ans - service conductors.
____________ extend from the utility source to the service disconnecting means.
Right Ans - Service conductors
Voltage. Unless other voltages are specified, for purposing of calculating
branch-circuit and feeder loads, nominal system voltages of: Right Ans -
120, 120/240, 240, 208Y/120, 240, 347, 480Y/277, 480, 600Y1347 and 600
volts shall be used.
Fractions of an Ampere. Except where the calculations result in, such major
fraction of an ampere (0.5 or larger) fractions are ____________. Right Ans -
permitted to be dropped.*
The calculated load of a feeder or service shall ____________ than the sum of the
loads on the branch circuits supplied, as determined by Part II of this article,
after any applicable demand factors permitted by Part III or IV or required by
Part V have been applied.* Right Ans - not be less
____________ loads can either be a calculated load based on the area in square
feet (square meters), using a unit load as determined from NEC Table 220.12,
or may be the actual connected load obtained by referring to the nameplate on
the equipment. Always use the larger load determined by the methods.
Right Ans - Lighting
The phrase ____________ load will be used to designate when the value is in
compliance with the requirements of NEC Article 220. Right Ans -
calculated
, The phrase ____________ load will be used to designate the value of the load as it
actually exists and is to be connected to the electrical system. Right Ans -
connected
Section 220.12 allows the use of the locally adopted ____________ code to be
used in place of the factors found in Table 220.12 but places strict conditions
on such use. Right Ans - energy
Use NEC Table ____________ to find the value of volt-amperes per square foot (or
per square meter) for general lighting loads, or use the actual volt-amperes if
that value is higher. Right Ans - Table 220.12
A sign outlet is assigned a minimum allowance of ____________ volt- amperes in
NEC 220.14(F) for each branch circuit required in NEC 600.5(A). Right Ans
- 1200
The heating load is used rather than the air-conditioning equipment, because
only one of the loads will ____________. Right Ans - operate at any one time.
The branch circuit for fixed electric space heating equipment is required to be
considered a continuous load by NEC 424.3(B). However, the load on the
____________ is shown as a noncontinuous load based on NEC 220.51. Right
Ans - Feeder
Referring to NEC 220.61, a feeder neutral conductor may be reduced in size in
certain situations. It may not be reduced in feeders consisting of: Right Ans
- 2-phase wires and a neutral conductor of a 3-phase, 4-wire, wye-connected
system because it carries approximately the same current as the ungrounded
conductors.
If the ampacity of a feeder does not match a standard OCPD rating then the
next ____________ standard rating may be used NEC 240.4(B), provided the
rating is 800 amperes or less. ampacity Right Ans - higher
This "round up" rule, as it is often referenced, does not allow the load to be
greater than ____________ amperes. The conductor must always be adequate for
the load. Right Ans - 130
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