Sewa Regulations for Electrical Installations — Summary & Practical Guide (PDF-ready) Overview
Purpose: Ensure electrical installations in buildings meet safety, reliability, and efficiency standards required by the Sharjah Electricity & Water Authority (SEWA). Scope: New installations, modifications, maintenance, earthing, protection, meters, contractor licensing, and inspection/testing before energization.
Key Requirements (concise)
Licensing & Applications
Work must be performed by SEWA-licensed electrical contractors. Submit application with: site plan, single-line diagram, load schedule, equipment specs, contract details, and owner ID. Obtain written approval before connection.
Design & Load Calculations
Prepare single-line diagram showing main incoming, distribution boards, meters, protective devices, earthing, and major loads. Calculate total load (kW/kVA), demand factor, diversity, and select transformer/meter accordingly. Minimum conductor sizes and derating per ambient temperature and grouping. Sewa Regulations For Electrical Installations Pdf
Protective Devices & Coordination
Overcurrent protection (MCBs, MCCBs) sized to protect conductors and equipment. Earth leakage protection (RCDs/ELCBs) for circuits supplying sockets and wet areas. Selective coordination to avoid nuisance trips; discrimination between upstream/downstream devices.
Earthing & Bonding
TN-S or TN-C-S systems per SEWA preference — provide main earthing terminal and earth pits as required. Equipotential bonding for metallic services, gas pipes, incoming water, and structural steel. Earth resistance target typically ≤ 1–5 ohms depending on installation class (confirm in full regs).
Cabling & Installation