NOT NEEDED RESUB1 BLD2023-0699+VOLTAGE Summary+9.21.2023_3.07.26_PM+37976899/20/2023
ELECTRICAL Voltage Drop Calculation for Edway Taphouse
SUPPORT COMPANY
We utilized the formula method for calculating voltage drop and took direct readings of load
on the lighting circuit.
Breaker size:
Voltage measured at breaker:
Measured amperage under load
Length of wire to furthest load:
Conductor Size:
K constant for copper wire:
Formula:
VD=2*K*I*D/CM
Single pole 20 amp
120.0 V
2.4 amps
140 feet (estimated maximum)
AWG #12 (6.53 kcmil)
12.9 ohms
VD = (2 * 12.9 * 2.4 * 140)/(6530 cmil) = 1.32 Volts
VD for lighting circuit:
1.10%
The overall voltage drop for the lighting circuit is 1.1%, well within the 5% maximum allowed
by the Washington Energy Code.