Techubox Academy is launching soon
Structured ELV courses built from real projects: CCTV, fire alarm, networking and more.
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.
Learning paths
Free step-by-step courses from a working ELV engineer. Follow a path in order, practise with the tools, and track your progress.
Browse by system
Pick the system you’re working on today.
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
18 browser-based calculators and designers, grouped by system. No sign-up.
CCTV & Video
6 toolsSize storage, pick lenses and lay out cameras on plans and maps.
Show 6 tools
- Storage & Bandwidth CalculatorHDD size, RAID and bitrate for mixed camera groups.
- FOV & Lens CalculatorLens, pixel density and IEC 62676-4 / DORI levels.
- Thermal Camera CalculatorDetection, recognition and identification ranges.
- Floor Plan DesignerPlace cameras on your drawing with live coverage.
- CCTV Map DesignerPlan outdoor cameras on a satellite map.
- Network & CCTV DesignerSingle-line diagrams with ping and link simulation.
Network & Wireless
5 toolsPlan IP ranges, fiber links, PoE, racks and Wi-Fi coverage.
Show 5 tools
- IP Subnet & VLAN Planner NewSubnet calculator plus VLSM VLAN plan for CCTV, access control and BMS
- Fiber Optic Loss Budget Calculator NewFiber link loss, SFP/GPON power budget, margin, reach & overload check
- PoE Budget Calculator NewCheck PoE switch budget, ports and class limits with cable loss
- Rack Layout & U Planner NewPlan 19" rack U space, weight, power, heat and draw the elevation
- Wi-Fi & Wireless Link DesignerWi-Fi heatmap, PtP and PtMP links with Fresnel, terrain and BOQ.
Fire & Life Safety
3 toolsDesign addressable and conventional systems and evacuation plans.
Show 3 tools
Power
2 toolsCheck cable voltage drop and standby battery or UPS runtime.
Show 2 tools
PA / Voice Alarm
1 tool100V, IP and hybrid PA/VA with SPL, STI, amplifiers and BOQ.
Access Control
1 toolDoors, readers, locks and controllers, with a full BOQ.
Show 1 tool
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Scan on your phoneLatest guides
New articles from the field.
Access Control System Components Explained
An access control system is much more than the reader on the wall. Here is what each component…
Read guide →IP Camera Not Showing on NVR: 12 Proven Fixes
IP camera stuck on Offline or a black tile? Follow this field-tested diagnosis flow and 12 proven fixes,…
Read guide →IP vs Analog (HD-TVI/CVI/AHD) CCTV Cameras: Which to Choose in 2026
HD analog or IP? A field engineer's comparison of cabling, distance, power, analytics, scalability and cost, with upgrade…
Read guide →Smoke vs Heat Detector: Differences and Where to Install Each
Smoke or heat detector? Learn how optical, ionisation, multisensor and heat detectors work, where each belongs, typical BS…
Read guide →Cat5e vs Cat6 vs Cat6A vs Cat7: Speed, Distance and Which to Use
A practical field comparison of Cat5e, Cat6, Cat6A and Cat7 (plus Cat8): bandwidth, speed, distance, shielding and PoE,…
Read guide →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 →
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 →
