PoE Voltage Drop & Cable Resistance Calculator
Verify terminal operating voltage and thermal power dissipation for IP CCTV cameras, Starlink PoE injectors, and Wi-Fi 6 access points. Prevent dusk camera brownout reboot loops caused by inferior CCA cabling.
Ohm's Law & The Physics of PoE Transmission
Power over Ethernet delivers direct-current (DC) power alongside high-frequency gigabit data over unshielded or shielded twisted pairs. Voltage attenuation across the run is governed by Ohm's Law and Joule heating:
The Copper Clad Aluminium (CCA) Hazard: Inexpensive cables bought from online marketplaces often use aluminium wire with an ultra-thin electroplated copper skin. Aluminium possesses nearly 60% higher electrical resistance than solid annealed copper. Under high PoE+ loads (such as PTZ cameras or infrared illuminators), CCA generates dangerous thermal resistive heating inside ceiling voids and causes premature hardware failure. ADI Communications exclusively specifies pure solid copper Cat6 (23 AWG).
Experiencing Dropped Camera Connections or Night Reboots?
Gary Pearce diagnoses PoE voltage drops, replaces degraded cabling with solid bare copper Cat6, and certifies installations with professional network analyzers across Yorkshire.
Need On-Site Engineering in Yorkshire?
Gary Pearce • 25+ Years Experience • £10M Public Liability • CAI-Benchmarked Materials