Power over Ethernet for Cameras - Switches, Watts and Cable Runs
Last verified: October 2026
A plain-English guide to PoE: how one cable carries both power and video, how to size the switch, and how far the cable can run. Rather have a hand? My number is (330) 200-8042.
Power over Ethernet, at a Glance
Most business cameras use Power over Ethernet — PoE — where a single network cable carries both the camera's power and its video back to a switch. The two things people miss: a switch has a total power budget shared across its ports, so it must supply enough for every camera (add up the makers' figures and leave headroom), and a single cable run tops out at about 100 meters — roughly 328 feet, with a midway switch or extender needed past that. For a building full of cameras, wired PoE is steadier than Wi-Fi. There's a printable 29-page version up top.
Common Questions
1 What does Power over Ethernet actually do?
It sends both power and video over one network cable, so each camera needs just a single run back to a switch — no separate power outlet at the camera. It's why professional camera installs almost always use it.
2 How do I size the PoE switch?
Count your cameras for the ports, then add up each camera maker's stated power draw and pick a switch whose total power budget comfortably exceeds that sum. Leave headroom for growth and for cold nights when heaters run. A switch can have free ports and still be full on power.
3 How far can one cable run?
About 100 meters — roughly 328 feet — for a single run carrying power and data, measured along the cable's real path through walls and ceilings, not the straight-line distance. Past that, add a switch or extender partway and continue with a fresh run.
4 Why not just use Wi-Fi cameras everywhere?
A Wi-Fi camera still needs a power outlet nearby, so it doesn't really skip the wiring — and a building full of them can bog down the network and drop out when it's busy. Wired PoE gives each camera its own steady line. Save Wi-Fi for the odd spot a cable can't reach.
5 Can a camera draw too much power?
Yes — a hungry camera (a heater, a pan-and-tilt motor) on an underpowered switch, or too many cameras for the switch's total budget, can leave a camera unable to power up even with free ports. Size the budget with headroom and match hungry cameras to a switch that can feed them.
6 Should I run the cable myself?
Plugging cameras into a switch and setting it up is within reach, but pulling cable through finished walls, soffits, or outdoors between buildings is usually best left to a pro. I'll plan it and set it up, and coordinate a licensed local pro for the cable pulls.
Would You Rather I Just Help?
Power over Ethernet has a few technical corners — the switch's power budget, the cable-run limit, matching hungry cameras — and getting them right once means years of trouble-free cameras. I'll help you plan the runs and size the switch, and line up a trustworthy local pro for the in-wall and outdoor cable pulls. $99 flat for a visit, $49 for help on your screen, 30-day come-back-free.
Would you rather I just do this for you?
No shame in it — plenty of folks would rather hand it off, and that's what I'm here for. I'll come to your home, set it up right, and make sure it's working before I leave. Flat $99 per visit — no jargon, no upsell, and every visit is 30-day come-back-free.
Not a hardware job? I can often fix it remotely for $49 — a secure screen-share, up to 2 hours, that you watch the whole time and can end whenever (included free for $39/mo Support Plan members, and it counts toward the $99 if it turns out I need to come out).