🚧 Cable Tray Size Calculation & Material Estimation (As per FEWA / DEWA / ADDC) Sharing a detailed example of how to calculate the cable tray size for different cable types — 4C x 25 sqmm, 35 sqmm, and 95 sqmm — including step-by-step methodology and a sample material list for a. 🚧 Cable Tray Size Calculation & Material Estimation (As per FEWA / DEWA / ADDC) Sharing a detailed example of how to calculate the cable tray size for different cable types — 4C x 25 sqmm, 35 sqmm, and 95 sqmm — including step-by-step methodology and a sample material list for a. Selecting the correct cable tray dimensions is a foundational decision in any electrical installation across the UAE and GCC. Get it right, and you establish a safe, reliable framework. This guide provides practical. Choosing the correct cable tray sizes is fundamental to the safety, efficiency, and future scalability of any electrical installation in the demanding environments across the UAE and GCC. A well-sized system does more than just hold cables—it organizes, supports, and protects them, preventing. A3. (a) Distribution Company Earthed System (TN-S) 108 A5. Especially in Dubai, where rules are tight, no one wants to risk penalties or rework because something didn't meet the safety code.