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Essential Electrical Notes Every Electrical Engineer Should Save

Gul Bahar Shah
  Essential Electrical Notes Every Electrical Engineer Should Save Correct sizing of protection devices and power components is one of the most important aspects of electrical system design. Oversizing increases cost, while under sizing can lead to overheating, nuisance tripping, equipment failure, and serious safety risks. This quick reference covers the basic sizing guidelines for capacitor bank components. 📌 Key Design Formulas 1. Capacitor Current (3-Phase) I = (kVAR × 1000) / (√3 × Voltage) This is the foundation for selecting all downstream components. 2. HRC Fuse Selection • Fuse Rating ≈ 1.6 × Capacitor Current ‣ Handles capacitor inrush current ‣ Protects against short circuits ‣ Use HRC fuses with high breaking capacity 3. MCCB Selection • MCCB Rating ≈ 1.25 × Capacitor Current ‣ Provides overload and short-circuit protection ‣ Choose suitable breaking capacity (Icu/Ics) ‣ Coordinate with upstream protection devices 4. Capacitor Duty Contactor Unlike standard contactors,...
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AHU ASSEMBLY – QUICK SUMMARY

Gul Bahar Shah

  AHU ASSEMBLY – QUICK SUMMARY

An Air Handling Unit (AHU) is assembled in sections to condition and circulate air in HVAC systems. Proper assembly ensures airtight construction, vibration control, and efficient airflow.

📦 MAIN AHU ASSEMBLY PARTS
• Base Frame & Anti-vibration pads
• Bottom Panel / Drain slope
• Side Panels (Double skin insulated)
• Cooling / Heating Coil Section
• Filter Section (Pre / Fine / HEPA)
• Fan & Motor Section
• Access Doors & Inspection Window
• Damper / Mixing Box
• Top Canopy (Weather protection)
• Flexible connection & accessories

🔄 TYPICAL ASSEMBLY SEQUENCE
Base Frame → Bottom Panel → Side Panels → Coil Section → Filter Section → Fan Section → Top Canopy → Doors → Final Alignment

⚙️ IMPORTANT CHECKS
✔ Base level & vibration isolator
✔ Drain slope properly installed
✔ Panels air-tight sealing
✔ Fan alignment & rotation check
✔ Filter installation direction
✔ Damper operation check


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