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Finding Voltage Drop Distance
How far from a single-phase 240-volt
source can you install a 15 amp load
using 60°C #10 Al branch circuit con-
ductors? Assume a 3% allowable volt-
age drop.
Steps
Keystrokes
Reset calculator [Set] [x]
Set to single ph. [Set] 1
Set to aluminum [CU/AL]
Enter amps
15 [Amps]
Enter volts
240 [Volts]
Enter wire size
10 [WireSz]
Enter 3% VD
3 [VD%]
Find distance
[Length]
Find actual
voltage drop
[VD%]
Find % v.drop
[VD%]
NOTE: The calculator automatically
makes adjustments for resistance using
NEC Chap 9, Table 8, if the insulation
type is other than 75°C.
Display
0.
1 PH
1Ø 60 Al 1 PH
15. AMPS
240. VOLT
10. AL
AWG WIRE SIZE
3. DROP V %
123.77387 FEET
7.2 DROP V
3.0 DROP V
User's Guide — 35
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