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Guides for CCTV & electrical technicians
Practical write-ups on the mistakes that commonly happen in CCTV and electrical installs, and how to avoid them.
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NVR Storage Calculation: 12 Mistakes That Leave You Short on Space
The formula is simple — 12 real-world factors are why the calculated number is often wrong.
IP Camera Bandwidth: Why the Switch (and PoE Budget) Fail First
Switch uplink overload and PoE power budget — the check most junior installers skip.
Analog vs. IP CCTV in 2026: Which Should You Actually Install
A balanced breakdown of when each system makes sense — not just "newer is always better."
How to Choose the Right Battery Size for a Security Panel
Exact Ah calculation, series vs. parallel wiring, and why lithium usually wins now.
Choosing the Right CCTV Lens: Coverage vs. Identification Distance
Why a wider lens usually means less detail — and how to actually match focal length to the job.
PoE Budget Calculator: How Many Cameras Can Your Switch Run?
Port count isn't the same as power budget — the math behind cameras rebooting after dark.
CCTV Voltage Drop Calculator: Why Cameras Fail After Dark
Long or thin cable runs sag under night-time IR current. Find the right wire gauge before it costs you a callback.
How to Choose the Right Wire Size (AWG) for Any Circuit
Load current, the 125% rule, temperature ratings, derating and voltage drop, step by step with worked examples.
Conduit Fill Explained: How Many Wires Fit in a Conduit
The 53%, 31% and 40% limits, wire and conduit areas, and worked examples for sizing EMT.