FIR2021-0153+Fire_Alarm_Voltage_Calculations+12.27.2021_11.48.31_AM+2592480RECEIVED
Dec 27 2021
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
F I R2021-0153
REVIEWED
BY
CITY OF EDMONDS
-•::::: COSCO
Fire Protection
EOL Voltage Drop Calculation
Starting Voltage
20.4 Volts
Minimum Voltage @ EOL
16 Volts
Voltage Drop Warning %
10.00%
Current Draw
Wire Type
Resistance
Length
Actual Resistance
Voltage @ EOL
Percent Drop
Circuit Name
Amps
AWG
Ohms/1000ft.
Feet (One Way)
Ohms
Volts
Percent
NAC 1
0.605
1#14 Solid
3.07
200
1.23
19.66
3.64
NAC 2
0.000
#14 Solid
3.07
0
0.00
20.40
0.00
NAC 3
0.000
1#14 Solid
1 3.07
0
0.00
20.40
0.00
NAC 4
0.000
1#14 Solid
1 3.07
0
0.00
20.40
0.00
Resistance Table
Wire Type
Resitance
AWG
Ohms/1000ft.
#10 Solid
1.21
#10 Stranded
1.24
#12 Solid
1.93
#12 Stranded
1.98
#14 Solid
3.07
#14 Stranded
3.14
#16 Solid
4.89
#16 Stranded
4.99
#18 Solid
7.77
#18 Stranded
7.95
Note: All Resistance values are taken from Table 8 Conductor
Properties of the NFPA 70 National Electrical Code. All values are
for Direct Current Resistance at 75°C (1670F).