dont forget the volt drop if your using CAT-5, 12vdc will suffer more than 24vac. measure your cable runs! it may be to much for 3x cameras over one power supply pair (brown/brown white) and you may overload your psu.

It may be better to run the signals (up to 4) over NVT/CAT-5 and run a seperate low volt feed. say using "cctv-1" power cable or evan 6 or 8 core with the cores twisted to lower the voltdrop over the one core.

POIP (power over ip) routers use massive supplies to push power over the cat_5 network but have to be bigger due to the power loss. loner cable run - bigger volt-drop.

what i tend to do is use .75 2 core cable (flex) for 12vdc or 24v ac and beldon for any telemetry on pan tilts etc, and either cat5 and baluns or coax for video signals.

dont forget the volt drop if your using CAT-5, 12vdc will suffer more than 24vac. measure your cable runs! it may be to much for 3x cameras over one power supply pair (brown/brown white) and you may overload your psu.

It may be better to run the signals (up to 4) over NVT/CAT-5 and run a seperate low volt feed. say using "cctv-1" power cable or evan 6 or 8 core with the cores twisted to lower the voltdrop over the one core.

POIP (power over ip) routers use massive supplies to push power over the cat_5 network but have to be bigger due to the power loss. loner cable run - bigger volt-drop.

if any of that is going to be a problem the O/P has bigger worries