1. Expertise & Licenses

• Power Engineer: Must have engineers with a Professional Engineering License (Kor Wor – กว.) in Power Engineering and direct experience in designing and installing High Voltage Electrical Systems, especially in restricted areas like Koh Samui, which may involve underground cables or areas prone to corrosion from the sea.
• Local Experience: Providers with a portfolio in Koh Samui or Suratthani Province will better understand the local regulations of the Provincial Electricity Authority (PEA) and the specific environmental conditions.

2. Standards & Safety

• Compliance with PEA and IEC/IEEE Standards: The design must strictly adhere to PEA requirements and should follow international standards such as IEC (International Electrotechnical Commission) or IEEE (Institute of Electrical and Electronics Engineers) to ensure system stability and safety.
• Insurance: Must have insurance policies covering potential damages during work and after installation.

3. Material Quality

• High Voltage Equipment: Should use standard-compliant and durable equipment such as Transformers, Protective Devices, and cables that can withstand hot, humid, tropical climates, especially near coastal environments.

4. After-Sales Service and Maintenance

• Preventive Maintenance: High-voltage systems require regular scheduled maintenance. It is advisable to choose a company that offers inspection, repair, maintenance, and 24-hour emergency electrical service in the Koh Samui area.