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26401 Load Calculations Feeders And Services Questions And Answers Latest Top Score.
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26401 Load Calculations Feeders And Services Questions And Answers Latest Top Score.
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26401 Load Calculations Feeders AndServices Questions And Answers Latest
Top Score.
Load vcalculated vat v2 vcircuit v1500VA. v- vcorrect vanswer. v v v vSmall vAppliance vCiruit
Voltage vdrop vformula v1
VD v= v(2*L*R*I)/1,000 v- vcorrect vanswer. v v v vVD v= vvoltage vdrop v(in vvolts)
L v= vload vcenter vor vtotal vlength vin vfeet
R v= vconductor vresistance vper vNEC vChapter v9, vTable v8
I v= vcurrent
The vnumber v1,000 vrepresents v1,000' vor vless vof vconductor.
Show vwindow vloads vshould vbe vcalculated vat v_____ vper vlinear vfoot vof vshow vwindow. v-
vcorrect vanswer. v v v v200VA
What vis vthe vminimum vdemand vrequired vfor vthe vportion vof va vfeeder vthat vsupplies v30' vof
vshow v windows?
6,000 vVA
5,400 vVA
3,000 vVA
2,700 vVA v- vcorrect vanswer. v v v vft vx vva v= vva
30ft vx v200VA v= v6,000VA
NEC v220.14(C)(2)
At v200 vVolt-amperes vper vlinear v300 vmm v(1 vft) vof vshow vwindow
Voltage vdrop vformula v2
VD v= v(2*L*K*I)/CM v- vcorrect vanswer. v v v vVD v= vvoltage vdrop
L v= vload vcenter vor vtotal vlength vin vfeet
, K= vconstant v(12.9 vfor vcopper vconductors; v21.2 vfor valuminum vconductors)
I v= vcurrent
CM= varea vof vthe vconductor vin vcircular vmils v(from vNEC vChapter v9, vTable v8)
Feeder vconductor vsize vis vadjusted vwhen?
The vload vsupplied vis va vcontinuous-duty vload.
More vthan vthree vcurrent-carrying vconductors vare vin va vraceway.
The vambient vtemperature vsurrounding vconductors vexceeds vtemperature vratings.
Voltage vdrop vexceeds v3% vfor vfeeders vor v5% vfor vthe vcombination vof vthe vfeeder vand
vbranch vcircuit.
All vof vthe vabove v- vcorrect vanswer. v v v vAll vof vthose vabove
In vcalculating vfeeder-circuit vconductors, vif vnoncontinuous vloads vequal v450 vamperes vand
vcontinuous vloads vequal v550 vamperes, v what vis vthe vtotal vcalculated vfeeder vload vthat vthe
vconductors vmust vhandle?
A. v1137.50 vamperes
B. v1100 vamperes
C. v950 vamperes
D. v1317.50 vamperes v- vcorrect vanswer. v v v vIn vorder vto vcalculate vthe vtotal vfeeder vload, vyou
vmust vadd v100% vof vnoncontinuous vloads vto v125% vof vcontinuous vloads.
450 v+ v(1.25 v× v550) v= v1137.50 vamperes
Using vthe v25' vtap vrule, vwhat vis vthe vminimum vsize vcopper vTHWN vconductor vrequired vfor
va vtap vfrom va v400A, v480V, v3Phase vfeeder?
1/0
2/0
No. v1
No. v2 v- vcorrect vanswer. v v v v1/0
Which vof vthe vfollowing vfactors vdoes vnot vaffect vconductor vampacity vadjustments?
A. vAmbient vtemperature
B. vNumber vof vphases
C. vContinuous vor vnoncontinuous vload
D. vNumber vof vconductors vin va vraceway v- vcorrect vanswer. v v v vThe vnumber vof vphases vis
vnot vlisted vas va vfactor vthat vaffects vthe vallowable vcurrent-carrying v capacity v(ampacity) vof
va v conductor, v while vthe vothers vlisted vdo vaffect vit.
Switchboard v- vcorrect vanswer. v v v vA vlarge vsingle vpanel, vframe, vor vassembly vof vpanels von
v which vare vmounted von vthe vface, vback, vor vboth, vswitches, vovercurrent vand vother
vprotective vdevices, vbuses, vand vusually v instruments. vSwitchboards vare v generally
vaccessible vfrom vthe vrears v well vas vfrom vthe vfront vand vare vnot vintended vto vbe vinstalled v in
vcabinets.
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