CCTV cable drop

[Flash]

Can any one point me in the right direction, I've been asked to quote for power supply only for 5-6 cctv cameras the distance of the cable is 1500 metres and have been told a maximum of 30 amps, doing cable drop calculations I'm coming out at over 95mm swa??? I must be doing something wrong? my heads hurting!!

 

[westward10]

That's nearly a mile away?

 

[Flash]

Yes that's correct, its the perimeter of a prison

 

[Richard Burns]

Calculate for the actual current draw not the absolute maximum, 30 A sounds a lot for 5 cameras but perhaps they are PTZ. Run the cable as a ring if possible to reduce volt drop.

 

[snowhead]

Is it cameras only or also local lighting, maybe why it's 30a ?

 

[James]

I think the solution might be to run a 230v ring, then a small local psu at each camera location?
Current will then be so low, volt drop will be negligible

 

[Flash]

just cameras, apparently they are roughly 5 amps per camera, but i have since found out that each column will have a poe that converts to 24v ac

 

[westward10]

Find it difficult to believe the power supplies will draw 5A.

 

[Charlie_]

5 amp @ 24v
So approx half an amp @ mains

 

[DPG]

As Charlie says - it won't be 5A at mains voltage.

 

[buzzlightyear]

for the distance that you require would be 24volt / 3amp

• Input : 100V-240V 50/60Hz
• Output : DC 24V 3A

 

[telectrix]

5 amp @ 24v
So approx half an amp @ mains

that's about 500mA in techno-speak.

 

[Jon Bateson]

Why not just run cat 5 with baluns, POE the cameras or use coax and inject dc into them. Loads of easier options

 

[Jon Bateson]

But if I was your wholesaler I would suggest the 95mm swa