User`s guide

User’s Guide — 43
IMPORTANT NOTE ON
VOLTAGE DROP CALCULATIONS
The ElectriCalc Pro calculates voltage
drop and wire size using DC resistance
as defined by the 2002 NEC. To find
the voltage drop for a specific wire size,
you must first enter amps and the one-
way wire length (and other required
variables), entering the specific wire
size last . Otherwise, for your safety the
calculator will recalculate the wire sizes
based on the ‘99 NEC Ampacity Tables
and maximum allowable voltage drop.
Finding Single-Phase
Voltage Drop
You are installing 175 feet of 75°C, #8
THW branch circuit copper conductors
to supply an 11A load on a 208V 1Ø
system. What is the source voltage
drop at the load?
Steps Keystrokes Display
Reset calculator [Set] [x] [On/C] 0.
Set to 1-phase [Set] [1] 1 PH
Set to 75°C [Set] [7] 1Ø 75 Cu 1 PH
Enter amps 11 [Amps] 11. AMPS
Enter volts 208 [Volts] 208. VOLT
Enter length 175 [Length] 175. FEET
Enter wire size 8 [WireSz] 8 CU
AWG WIRE SIZE
Solve volt. drop [VD%] 3.0 DROP V
Solve % v.drop [VD%] 1.4 DROP V %
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