Quick answer: A 50 foot ethernet cable is 15.24 m, a comfortable length inside the 100 m channel of 90 m permanent link plus 10 m of patch leads. Buy stranded Cat6 for a lead that gets moved and solid cable for anything fixed. Expect AU$18 to AU$45 for a ready made 15 m Cat6 lead, and expect PoE at 30 W to lose about 1.1 V over that distance. Buy the category that matches the switch rather than the shelf label.
The camera needs power and data at the far corner of the block, the switch is in the hallway cupboard, and 15 m is the length that reaches. A 50 foot lead works, but only if the construction and the category suit the job, because the last lead in a run is where most faults appear. Measure the route, then buy the construction it demands.
Fifteen Metres in the 90 m Budget
Where the length sits
The channel limit is 100 m and it includes patch leads at both ends. Fifteen metres leaves plenty of room even with a 40 m permanent run behind it. Trouble arrives when three 15 m leads are chained with couplers, which adds connectors and length without adding signal margin.
Why chaining leads fails
Chaining is common in offices and always ends badly: each coupler adds a reflection and each joint is a place to work loose. If the run needs 30 m, buy a 100 foot ethernet cable instead of two 15 m leads joined in the middle of a corridor.
Stranded Patch or Solid Installation Cable
Stranded for handling
Stranded conductors flex without breaking, which suits a lead that is coiled, moved and plugged in weekly. Solid conductors have lower resistance and better high frequency performance, which suits permanent runs in conduit. A solid lead bent repeatedly at the plug will break a conductor inside the jacket.
Solid for anything fixed
Ready made 15 m leads are almost always stranded, which is fine for patching. Anything clipped to a skirting board, run through a wall or pulled into a ceiling should be solid installation cable terminated on an RJ45 keystone jack at each end.
What PoE Loses Over 15 m
| Load at the device | Current at 53 V | Drop over 15 m | Drop over 30 m |
|---|
| Camera at 12 W | 0.23 A | 0.45 V | 0.9 V |
| Access point at 15 W | 0.28 A | 0.55 V | 1.1 V |
| Access point at 30 W | 0.57 A | 1.11 V | 2.2 V |
| PTZ camera at 60 W | 1.13 A | 2.2 V | 4.4 V |
| PoE lighting at 90 W | 1.70 A | 3.3 V | 6.6 V |
PoE runs at about 53 V at the source, and the cable loses volts in proportion to current and length. At 30 W over 15 m the loss is near 1.1 V, which is harmless. At 90 W it reaches 3.3 V, and a long thin lead can then push a device below its minimum input voltage.
Routing Through an Australian Home
Timber frames and brick veneer
Most Australian homes use timber frames with brick veneer or weatherboard, so a 15 m lead can follow a skirting, pass behind a wardrobe and reach the next room without opening a wall. Keep it at least 100 mm from mains cable where possible and never staple through the jacket.
Strata and rented walls
In a strata apartment, drilling is often prohibited, so a surface run in a plastic duct is the practical answer. Adhesive clips and an interior rated duct keep the lead tidy and removable when the lease ends, and no one has to patch plaster.
Buying the Right 15 m Lead
Choose category first: Cat5e carries 1 Gbit/s at 15 m, and Cat6 is worth the small premium if 2.5G is planned. Then check the plug moulding and the wire gauge, and read the 50 foot ethernet cable specification for the tested length rather than the marketing photo.
Send the device, the PoE class and the route to zongcarrie@zh-zong.com or call +86 13543026126. We will confirm category, construction and plug type, then quote in AUD with freight to your postcode.
Practical scenarios
- Situation: A weatherboard house in Brunswick needs a camera feed at a corner 15 m from the NBN cupboard. What to do: Run solid Cat6 in conduit and terminate on keystones rather than using a stranded patch lead.
- Situation: A Gold Coast townhouse office has three desks 15 m from the router. What to do: Buy three stranded Cat6 leads of 15 m and label each end instead of chaining shorter leads.
- Situation: A clinic in Adelaide mounts an access point on a ceiling 15 m from the switch. What to do: Use solid Cat6 to a keystone and check the PoE budget, since 30 W loses about 1.1 V there.
- Situation: A warehouse in Western Sydney crosses a walkway with a 15 m lead to a printer. What to do: Use a cable ramp or duct, because a lead under foot fails at the plug within weeks.
FAQ
Is 50 feet exactly 15 m?
Fifty feet is 15.24 m, so a metric 15 m lead is 240 mm shorter and just as suitable. Buy by the metre when the route is measured, and allow 300 mm of slack at each end for service loops.
Stranded or solid for a 15 m run?
Stranded if the lead will be moved, coiled or unplugged regularly. Solid if it goes into a wall, ceiling or duct and stays there. Solid has lower loss, but it cracks if it is bent repeatedly at the plug, and a spare lead belongs in the cupboard.
Will 15 m add noticeable latency?
No. Signals travel through copper at roughly two thirds the speed of light, so 15 m adds about 75 ns, far below anything perceptible. Delay comes from the network equipment, not from a lead of this length. Ping the far end if you doubt it.
