CCTV wiring question

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Im in the process of having a CCTV set up in my house.

Installed cat6 to all camera points.

My question is that do i need to put in separate power supply ie a 2 core flex
Or shall i use a cat 6 pair.

My only worry is if a use a pair for Power from cat6 will it cause any interference

also a installer advised to use separate power supply to avoid interference .

Is this true
 
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Never had a problem as long as they are not long cable runs and you use quality baluns, quality power supply.
 
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When you say should not be long runs. What is the minimum run before you start having problems.

One of my longest run will be less than 20 metres
 
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you don't use 1 pair for power

use 1 pair for video

use all the remaining pairs for power, in parallel (all solid colours to +, all stripey colours to -) to reduce volt drop
 
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