0.5
1.0
2.0
4.0
10.0
Distance
(Feet)
25
22
22
22
20
18
50
22
22
20
18
14
100
22
20
18
16
12
200
22
18
16
12
-
300
20
16
14
10
-
400
18
16
12
10
-
500
16
14
12
-
-
0.5
Amps
1.0
Amps
2.0
Amps
4.0
Amps
10.0
Amps
AWG
10
.10
.20
.40
.80
2.00
12
.16
.32
.64
1.25
3.2
14
.25
.50
1.0
2.0
5.0
16
.40
.80
1.60
3.20
8.00
18
.64
1.32
2.64
5.28 12.80
20
1.01
2.02
4.04
8.08 20.20
22
1.60
3.20
6.40 12.80 32.00
VOLTAGE DROP
MINIMUM WIRE GAUGE FOR
MAXIMUM 3.2 VOLT DROP
This table lists the required minimum wire size necessary to complete a paired
wire run of the stated length and experience no more than a 3.2 volt drop be-
tween the power supply and the camera or other powered device. In the exam-
ple above, should the cable run have been 200 feet rather than 100, with a 2
amp load, in order to not have a drop in excess of 3.2 volts, the wire size would
need to be at least 16 AWG. An alternative solution would be to power the load
with an original voltage of 28 VAC.
This chart illustrates voltage drop
per 100 feet of paired wire
as a function of
wire gauge and load current. By matching load current (Amps) across the top of
the chart with wire gauge (AWG) down the left side of the chart, one can deter-
mine voltage drop per 100 feet of paired wire run. Note: at 24 volts, 2 amps = 48
watts. For that size load the voltage drop for 100 feet of 18AWG would be 2.64
volts.
PS1-24 Owners Manual.pub
page 5
Tuesday, September 26, 2006 13:27
