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Normally, the power wires have some resistance. There is some loss during voltage
transmission. The longer the wire is and the smaller the wire diameter is, the worse loss will be.
Please refer to following wire diameter and distance requirement in order to avoiding the
abnormal work caused by insufficient voltage.
Power wires diameter
0.5mm
2
(20#)
1.0 mm
2
(18#)
1.5 mm
2
(16#)
2.5 mm
2
(14#)
Dome camera distance
11m(37 ft)
18m(60 ft)
29m(95 ft)
46m(152 ft)
For example: the distance to power supply from the dome camera is 35mm. It must take 2.5 mm
2
above section copper-core power wires or it may cause insufficient power supply leading to
abnormal work
Ask: what is the MAX. Distance of video wire and what requirements does it have to wire materials?
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The video wire also has inner loss as the power wire. The more the wire is and the small the
specification is, the worse loss it will be. The high the signal frequency is, the obvious the loss
is. The normal video wires models and the MAX. Transmission distance is listed in following
table:
Video
cable
model
Max.
transmission
distance
Video cable model
Max.
transmission
distance
75-2
About 150m
75-5
About 370m
75-3
About 200m
75-7
About 500m
75-4
About 270m
75-9
About 680m
Ask: what wire and transmission distance should RS RS-485 control line take?
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Transmission distance of RS RS-485 is related to wire diameter and transmission speed. Max.
transmission distance for RS RS-485 is 1200M according to the specified 9600b/s transmission
speed for 1.0mm2 UTP.
Remarks: the same model wires may be different for produced by different manufacturers. Above
data is the normal wire transmission reference distance.
