CCTV Camera Wire 90 Mtr Roll: How Far and How Many Cameras

A cctv camera wire 90 mtr roll is simply the amount of cable on the drum, not the distance a camera can send video. Every camera needs its own unbroken run from the recorder, measured along the real route plus spare at both ends, so one roll is shared out between cameras rather than stretched across them. In practice one roll often covers only a few cameras, and you only know the real number once you have measured every route.

This guide shows how to measure, how to split a roll, what "3+1" on the label means, and what to check before you cut anything. If you are still deciding on cable type and connectors, start with our guide to coax, Siamese cable and BNC plugs and come back here to plan quantities.

What is actually on a 90 m roll

Most rolls sold as CCTV camera wire for wired analog systems are Siamese cable: a coax cable for video moulded alongside a pair of thin wires for 12V power. Labels such as "3+1" or "4+1" usually describe how the cable is built, for example a video core plus power cores, but sellers use these labels loosely. Read the printed description on the drum or box, not just the short name, and check three things:

• What the "+1" or "+2" is. On many rolls it refers to the power pair. On some it refers to an extra core or a different layout. If the description is unclear, ask the seller before you buy.
• The centre conductor. Solid copper carries video further than copper-coated steel. The label or listing should say which.
• Indoor or outdoor jacket. Anything that runs outside needs an outdoor-rated jacket or conduit.

A roll sold as a "100m cctv cable" is the same idea with a little more cable. Treat the printed length as a nominal figure, and if your plan is tight, measure what is left as you go rather than assuming the roll is exact.

Note that this cable is for coax (analog or HD-over-coax) cameras with a DVR. Network cameras run on network cable instead. If you are not sure which kind of system you have, the comparison of IP and analog cameras explains how to tell.

Why each camera needs its own run

Wired coax systems are built as "home runs": one cable from each camera straight back to its own input on the recorder. You cannot loop one cable past several cameras the way you might with a mains lighting circuit, because:

1. Each camera sends its own video signal, and the recorder needs a separate input for each one.
2. Each camera is powered through its own pair of power cores, ideally from its own fused output on the power supply, so a fault on one camera does not take down the others.
3. Joints weaken the signal and invite water. A run made from several offcuts joined together has more places to fail, especially outdoors.

So the question is not "how far will 90 m reach" but "how many complete, unjoined runs can I cut from 90 m".

Step 1: Decide where the recorder goes

Every run starts at the recorder, so its position decides how long all your cables are. A recorder in a central spot shortens every run. A recorder in a far corner can make the longest run much longer than you expected.

Pick a dry, cool, hard-to-reach spot with a power socket and a router nearby. Our guide on where to put a CCTV recorder covers the trade-offs between a locked cupboard, a lockbox and a small wall rack. Once the location is fixed, measure from there.

Step 2: Measure each route the way the cable will really go

Straight-line distances on a floor plan are always too short. Walk each route with a tape measure or a measuring wheel, or measure section by section:

1. From the recorder up or along the wall to where the cable enters the ceiling, roof space or trunking.
2. Across the ceiling or loft, following joists or existing cable routes rather than a diagonal you cannot actually use.
3. Down or out to the exit hole in the wall, including the thickness of the wall.
4. Along the outside wall to the camera bracket, following gutters, corners or conduit where the cable will be fixed.
5. Around corners and obstacles. Every bend, door frame and beam adds length.

Write each section down and add them up for each camera. Label the cameras now (for example "Front door", "Gate", "Back yard") and use the same names on the cable labels later.

Step 3: Add slack at both ends

A run measured to the exact length will be short once you terminate it. Add a margin to every run:

• At the recorder end, enough to reach the back of the recorder and the power box with a neat loop, and to let you pull the recorder forward on its shelf.
• At the camera end, enough for a service loop, a drip loop below the entry hole, and a fresh termination if a plug ever needs to be cut off and refitted.
• A general margin for measuring errors and small route changes during the install.

How much slack you need depends on your building and how neat you want it. Many installers add a fixed allowance to each end plus a small extra on long runs. Whatever you choose, apply it to every run so your totals are honest.

Step 4: Fit the runs into the roll

Now list your runs, longest first, and see how many fit into 90 m.

A worked example, with assumptions stated. Imagine a house with the recorder in a cupboard near the middle. After measuring the real routes and adding slack at both ends, the four runs come out like this:

• Back yard: 32 m
• Gate: 28 m
• Front door: 24 m
• Side passage: 20 m

The total is 104 m, which is more than one 90 m roll. The three longest runs together use 84 m and leave 6 m, which is too short for the side passage. In this example, one roll covers three cameras and the fourth needs a second roll or a different cable source. Your own numbers will be different: the point is to add up real routes, not to divide 90 by a guess.

Two habits make this step easier:

• Cut the longest run first. If anything goes wrong later, it is easier to find a home for a short leftover than to discover the last long run does not fit.
• Do not plan on joining leftovers. A 6 m offcut is useful for a test lead or an indoor camera close to the recorder, not as an extension stuck onto an outdoor run.

Step 5: Check the length will actually work for video and power

A run fitting on the roll does not guarantee it will work well. Two limits matter on longer runs:

• Video distance. How far a clear picture travels depends on the cable quality, the camera's output format and the recorder. HD-over-coax formats often handle longer coax runs than old standard-definition cameras, but check the camera and recorder manuals for your models rather than relying on a figure from a forum or a box.
• Voltage drop on the power pair. The thin power cores in Siamese cable lose some voltage over distance. The camera may start fine during the day and then reboot, flicker or lose its picture at night when the infrared lights switch on and draw more current.

If your longest run is near the edge of what the manual suggests, plan for it now: use a better cable for that one run, or have a qualified electrician fit a weatherproof outdoor socket so the camera can be powered locally.

Step 6: Pull, label and test before you cut the next run

1. Label the cable with the camera name at the drum end before you pull it, and again at the far end once it is in place.
2. Pull the run, then cut it from the roll with the agreed slack at each end.
3. Fit the BNC and DC plugs and connect a camera on the bench or at the recorder end to confirm picture and power before you mount anything.
4. Note the remaining length on the roll. If you marked the length printed on the jacket at the start, you can read the difference instead of guessing.

Testing each run straight away means a fault is found when you still have cable to replace it.

What each problem usually means

• No picture on one channel, but the camera appears to have power (for example, its infrared glows faintly in the dark). Often a poorly fitted BNC plug, a video format mismatch, or a run longer than the video signal can manage. Our guide to a TVI camera showing no picture on a DVR walks through the format settings.
• Picture fine by day, drops or reboots at night. Usually voltage drop on a long, thin power pair when the infrared lights come on. Measure voltage at the camera end with the infrared running.
• Rolling lines or interference bars. The cable may run alongside mains wiring, or the shield may be damaged or poorly terminated.
• Soft, smeared or colourless picture only on the longest run. The run may be beyond what that cable and camera format handle well. Try the same camera on a shorter run to confirm.
• You ran out of cable on the last camera. The routes were measured too short or slack was left out. Re-measure the remaining route properly before buying more, and buy a continuous length rather than joining.

Safety while you install

Pulling cable usually means ladders, roof spaces and drilling near existing wiring. Switch off power to any circuit near where you are drilling, use a stable ladder with someone holding it, and avoid working on roofs in wet or windy weather. Keep low-voltage camera cable away from mains cables, and if you need a new outdoor socket or any work on mains wiring, use a qualified electrician. Check local rules for running cables outside or between buildings.

When to get help

Call an installer or electrician if:

• Your longest run looks close to or beyond what the camera and recorder manuals suggest.
• The only practical route goes through areas you cannot reach safely, such as a high roof or a shared wall.
• You need a camera powered locally and that means new mains wiring.
• You have several faults at once and cannot tell whether the cable, the plugs, the camera or the recorder is to blame.

Install or resell cameras?

For installers and shops, quoting cable by the roll instead of by the measured run is a common cause of surprises on site. Measure each route with slack, add it up, and quote the number of rolls that total requires, with the longest run cut first. Keep a short offcut for bench testing every camera before it goes up, and tell customers clearly that each camera needs its own run back to the recorder. If you install or sell security cameras, you can find information on the Yoosee dealer program.

Frequently asked questions

Can I run two cameras from one 90 m roll without cutting it?

No, not on a standard wired coax system. Each camera has its own input on the recorder, so the roll gets cut into one separate length per camera.

Is 90 m too long for a single camera run?

It can be, depending on the cable, the camera's video format and the power pair. Long runs may lose picture quality or suffer voltage drop at night. Check the camera and recorder manuals for the distance they support, and consider powering a very distant camera locally.

What is the difference between 3+1 and 4+1 CCTV cable?

These labels describe how the cable is built, usually a video core plus a number of power cores, but sellers do not use them consistently. Read the full description on the drum, or ask the seller what each number refers to, before you choose. The cable must suit the camera type and the power it needs.

Can I use leftover pieces from the roll?

Yes, for short indoor jobs such as a camera near the recorder or a test lead on the bench. Avoid joining several offcuts into one long outdoor run, because every joint is a possible failure point and a way for water to get in.

How do I check how much cable is left on a roll?

Many cable jackets have length marks printed along them; check yours. Note the mark at the start and after each cut, and subtract. If there are no marks, measure each piece as you cut it and keep a running total.