Calculated Industries 5065 - Manual (Page 47)

42 — ElectriCalc Pro
IMPORTANT NOTE ON
VOLTAGE DROP CALCULATIONS
The ElectriCalc Pro calculates Voltage
drop and wire size using DC resistance as
defined by the 2005 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 maxi-
mum 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
Clear calculator
o o
0.
Set to 1-phase
S 1
1 PH
Set to 75°C
S 7
1Ø 75 Cu 1 PH
Enter Amps
1 1 A
AMPS 11.
Enter Volts
2 0 8 U VOLT 208.
Enter Length
1 7 5 l FEET 175.
Enter wire size*
8 w
AWG 8 CU
WIRE SIZE
Solve volt. drop
v
DROP 3.0 V
Solve % v.drop
v
DROP 1.4 V %
* Wire size can also be entered in Circular
Mils (e.g.,
1 6 5 1 0 w
enters
16,510 CMILs and displays 8 AWG wire
size).