The 24 volt low voltage wire can depressurize up to 300 meters.
1, the best transmission distance of DC12V is controlled at about 50 meters, generally more than 50-100 meters, the voltage begins to drop, it is not recommended to use 12V after 100 meters, you can use 24V or 36V, and then 12V.
2, DC24V transmission distance of about 300 meters is more reasonable, more than 300 meters of voltage began to drop significantly, the farthest can generally be used 500-800 meters, every hundred meters of pressure drop of about 1V.
3, AC220V transmission is far away (1000 meters are stable), but in the actual construction will not be long-distance transmission, because the construction site generally has 220V AC for use, such as residential buildings, buildings, commercial squares, squares, stations, etc., so the principle is to take electricity nearby.
4, monitoring installation to ensure the safety of the use of safe voltage (below 36V), so generally use 100 meters of monitoring probe with 12V direct transmission, more than 100 meters to 500 meters or so with 24V-36V transmission, at the end of the buck module to 12V, if more than 800 meters of monitoring probe, It is recommended that the nearby mains power supply be 220V and then DC transmission.
5, in addition, the above transmission distance, pressure drop and the use of cable diameter, material has a direct relationship, according to the distance of economic and reasonable line diameter DC12V with 0.75-1.5 square, DC24-36V with 1.5-2.5 square.
6, and the DC switching power supply should also be reasonable choice, greater than the power of all the cameras in the line and about 1.5 times, to ensure that the night infrared lights need to start.
The current I=P\/U=1000\/24=41.67A voltage drop is assumed to be calculated according to 5% (depending on the working voltage requirements of the equipment), and the allowable voltage drop of 24V is 5%. That is, 1.2V cable allows maximum resistance R=U\/I=1.2\/41.67=0.0288Ω copper resistivity is 1.75x10^-8Ω·m copper cable resistance = resistivity * length\/cross-sectional area so cross-sectional area S= resistivity * length\/resistance =1.75x10^-8 (m*Ω) x200m÷0.0288 (Ω) =1.215m2x10^-8 =121.5mm2 Because there is no 121.5mm2 cable specification, choose the specification larger than this cross-sectional area closest, that is, 150mm2
24v low voltage wires can be depressurized up to 17 meters