The M&E system is divided into four main categories:

1.Heating Ventilation Air Conditioning (HVAC for short)

2. Water supply and drainage and sanitary equipment (Plumbing & Sanitary, P&S for short)

3. Electrical (Electrical)

4. Fire alarm & fire fighting system.

In the above 4 items, the Electrical part accounts for about 40-60% of the volume of M&E (Depending on each project, it can even be up to 70.80%).

The Electrical part can be divided into the following parts:

Heavy electricity includes:

1. Main power supply: is the main power supply system, including medium voltage cabinets, medium voltage lines, 24kV/0.4kV transformers and main switchboards (called MSB, main switch board). May have additional (Automatic Voltage Regulator System: Automatic Voltage Regulator System, AVR for short)

2. System of distribution cabinets: Submain power supply (including power supply for motivation, production, lighting, sockets …)

3. Living lighting system: Lighting

4. Socket system: Socket outlet

5. Emergency lighting system: Emergency lighting (exit light, emergency light)

6. Earthing system: Earthing system (or grounding system)

7. Lightning protection system: Lightning protection system (including grounding rods and lightning collector, other than grounding system)

Light electricity

1. LAN and Internet system: Data network system

2. Telephone system: Telephone system

3. Security monitoring system: Security & Supervisior system.

4. PA system (public address system) ….