Field-tested guides and free design tools for ELV engineers
CCTV, networking, fire detection and smart-building know-how written from real job sites, not datasheets. Plus free calculators to design faster.
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Smart CCTV
IP vs analog, NVR storage, lens selection, installation and wiring.
Explore →Networking & LAN
Structured cabling, fiber, switches, PoE budgets and VLANs.
Explore →Fire Detection
Detector spacing, loops, panels and BS 5839 / NFPA 72 basics.
Explore →Smart Systems
Home and building automation, access control and integration.
Explore →Free engineering tools
Run them in your browser. No sign-up.
Storage & Bandwidth Calculator
HDD size, RAID and bitrate for mixed camera groups.
Open tool → CCTVFOV & Lens Calculator
Lens, pixel density and IEC 62676-4 / DORI levels.
Open tool → CCTVThermal Camera Calculator
Detection, recognition and identification ranges.
Open tool → CCTVFloor Plan Designer
Place cameras on your drawing with live coverage.
Open tool → CCTVCCTV Map Designer
Plan outdoor cameras on a satellite map.
Open tool → FIREFire Alarm Design Tool
Detectors, sounders, loops, battery and BOQ.
Open tool → FIREExit Plan Designer
Bilingual evacuation plans with signs and routes.
Open tool → NETWORKNetwork & CCTV Designer
Single-line diagrams with ping and link simulation.
Open tool →Need a custom tool?
Tell me what you calculate by hand every week.
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New articles from the field.
How to Reset a Hikvision or Dahua NVR Password (Official Methods)
Locked out of a Hikvision or Dahua NVR? This guide walks through every official, manufacturer-supported reset method, plus…
Read guide →CCTV Field Of View Calculator
Choosing a CCTV lens by guesswork is the fastest way to end up with a camera that “sees”…
Read guide →CCTV Installation & Wiring Guide: HD Analog & IP Cameras
CCTV Installation & Wiring Guide HD Analog and IP Cameras from Beginner to Advanced & 60-Camera DIY Project…
Read guide →Thermal Cameras for Fire Prevention🔥
🔥 1. Introduction Thermal cameras are advanced imaging devices that detect heat instead of visible light. By measuring infrared…
Read guide →Dual-Sensor Thermal PTZ Cameras for GCC Perimeter Security- ENC-HPT7Z-50X-39
Dual-Sensor Thermal PTZ Cameras for GCC Perimeter Security Perimeter security across the GCC faces a challenge that visible-light…
Read guide →AI in Modern CCTV Systems
Complete Guide of Analytics in Modern CCTV Systems Artificial Intelligence (AI) has transformed traditional CCTV systems from passive…
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ELV & security design support for your next project
From concept drawings to commissioning, get an engineer who has delivered CCTV, fire alarm, PA and network systems on real sites in Saudi Arabia and Africa.
Discuss your projectAbout me- 📐 System design & layouts (CCTV, fire alarm, PA/VA)
- 📋 BOQ, datasheet review and compliance checks
- 🔌 Network & fiber backbone planning
- ✅ Pre-commissioning and testing checklists
Hi, I’m Sarwar
Senior ELV & ICT project engineer. I write Techubox so technicians and engineers can skip the trial and error I went through on site. Read my story →