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Powers Supply Amperage

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Is it  necessary to use all 3 pairs of remain wires in cat5e cable for the power supply
as shown in this diagram?
 The cameras are just a few metres from the DVR and the cat5e cable is about 12 to 15 metres long    



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On 4/1/2019 at 8:24 AM, Kalip said:

Does anyone know what amperage powers supply is required to power two of these cameras?

The manual is silent on this issue.


The cameras draw aprpx 500ma per camera with infrared active and colour day is about 400ma no infrared you don't need all the pairs for power I use brown and white brown as pos and blue pair as neg 

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.I tried using this 2.5 amp. power adapter splitter to power both cameras.
However, I noticed that I am getting   ground loop problems.
When I used two separate power supplies the ground loop problems stopped.
Are these power splitter power adapters any good?
On another note, I noticed is that the guy who installed the other 5 cameras used an
 Although the adapter says 4 channels, he doubled the connection on one terminal to 
accommodate two cameras on that single terminal. Is this normal?







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