Tables > Conduit and Tubing > Voltage Drop > Steel Conduit Voltage Drop Multiplier
Multiplier for steel conduit voltage drop calculations

Wire Size Ampacity Direct Current Three Phase
(60 Cycle, Lagging Power Factor)
Single Phase
(60 Cycle, Lagging Power Factor)
Type Type Type
T, TW
(60 degrees Celsius Wire)
RH,
THWN,
RHW,
THW
(75 degrees Celsius Wire)
RHH,
THHN,
XHHW
(90 degrees Celsius Wire)
100% 90% 80% 70% 60% 100% 90% 80% 70% 60%
1420202561405369488743713848332262005643504744443836
1225253038603464316928412508217240003659328128972508
1030354024202078191817281532133424002214199517691540
84050551528135012641148102690015601460132611841040
6556575982848812745673597980937860777690
4708595616536528491450405620610568519468
385100110490433434407376341500501470434394
29511513038834635433631228640409388361331
1110130150308277292280264245320337324305283
0125150170244207228223213200240263258246232
0145175195193173196194188178200227224217206
0165200225153136162163160154158187188184178
0195230260122109136140139136126157162161157
25021525529010393123128129128108142148149148
300240285320867710811511711790125133135135
35026031035073679810610910978113122126126
4002803353806460919910310470105114118120
5003203804305250819094965894104109111
6003554204754343758489892508697103106
75040047553534366878848842799197102
10004555456152631627278823672849095
 
 
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