The design and installation of low voltage electrical systems play an important role in every modern project. Low voltage is an indispensable item to operate security equipment, telecommunications, and surveillance cameras in a smarter and more optimal way. Follow the following article, VictoryCons , a reputable professional M&E contractor in Vietnam, will provide you with specific information about low voltage electrical systems and how to distinguish low voltage from heavy voltage.
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1. What is low voltage?
In the field of M&E, extra low voltage , also known as ELV (Extra Low Voltage), is an electrical system that operates at low voltage. The voltage level of extra low voltage usually does not exceed 60V DC or 35V AC, which is a safe voltage threshold for users. Therefore, extra low voltage is very popular in building projects, apartments, factories and modern constructions.

Low voltage electricity plays an important role in the efficient operation and management of buildings. This system helps optimize modern technological utilities, ensure safety and security, and contribute to improving the quality of life and experience for users.
2. What does the low voltage electrical system include?
Modern buildings often invest in low voltage electrical systems to improve efficiency and optimize equipment operation. Depending on the scale and purpose of the building, the low voltage electrical system may include the following components:
- Data & Tel network system: This is a network and telephone cable system that helps maintain internal connections and external communications, ensuring information is transmitted quickly and stably.
- CCTV system: The camera system helps monitor security, record images and support management, ensuring safety for people and property in the project.
- Public Address System (PA): A public address system is used to convey information, emergency announcements, or play background music in public areas of a building.

- Access Control System: a system that manages the entry and exit of people and vehicles in a building, using devices such as magnetic cards, PIN codes or biometrics to ensure that only authorized people can access certain areas.
- Fire Alarm System: An early fire detection and warning system, including devices such as smoke detectors, heat detectors and fire alarms, helps to promptly handle emergency situations and ensure the safety of residents.
- Intrusion Detection System: This system uses sensors and alarm devices to detect and prevent unauthorized intrusion, protecting property and people in the building.
- Building Management System (BMS): The BMS system integrates and monitors technical systems in the building such as electricity, water, air conditioning, and lighting, helping to optimize operations and save energy.
- Car Parking System: This system automates parking management, including access control, parking guidance and charging, improving space efficiency and user experience.

- Intercom system: Intercom system allows communication between areas in the building, often used in apartments and offices to enhance communication and security.
- Cable and satellite television systems (MATV, CATV): This system provides television signals from service providers or broadcast stations, ensuring entertainment and information needs for residents and building users.
- Lighting Control System: The lighting control system automatically adjusts the lighting in the building based on time, natural light or human presence, helping to save energy and create a comfortable living environment.
- Audio Visual System (AV): AV system integrates sound and image, used in meeting rooms, conferences, lecture halls to support projection, presentation and effective communication.
The design and implementation of low voltage electrical systems is an indispensable factor in creating comfort, safety and optimizing operations for each modern project. To better understand the role of the M&E system, you need to clearly distinguish between low voltage and heavy voltage based on the function and scope of application of each type of system.
3. Distinguish between light and heavy electricity
Newcomers often confuse the two concepts of light electricity and heavy electricity . Clearly distinguishing between these two systems not only supports the design and construction process, but also ensures long-term investment and operational efficiency. The table below will describe the basic characteristics to help you distinguish between light and heavy electricity systems accurately:
| Criteria | Heavy electrical system | Low voltage electrical system |
| Operating voltage | Operates at high voltage: 3 phase 380V or 1 phase 220V. | Low voltage operation: no more than 35V AC or 60V DC. |
| Main function | Supply electricity to high power consuming devices such as production, lighting, lightning protection. | Serving small power consumption systems, information technology, security, communications and automation. |
| Power supply system | Transformer stations, medium voltage cabinets, generators, capacitor banks, ATS (Automatic Transfer Switch) systems, UPS (Uninterruptible Power Supply) systems, medium and low voltage cables, power distribution boards (MSB),… | Central fire alarm cabinet, network equipment (switch, router), video recorder, camera, speaker, microphone, access control device, sensor, network cable, signal cable,… |
| Equipment used | Production machinery, lighting systems, air conditioning, elevators, water pumping systems, lightning protection systems, etc. | LAN/WAN network, surveillance camera (CCTV), public address system (PA), access control, fire alarm, building management system (BMS), cable TV, intercom,… |
To implement suitable electrical systems for construction projects, you should choose a reputable and capable contractor. This will help ensure progress, construction quality as well as optimize costs throughout the project implementation process.
4. VictoryCons – Vietnam’s leading M&E contractor
VictoryCons is a leading M&E contractor in Vietnam with over 14 years of experience in the field. The company has completed over 50 large and small projects nationwide such as LuxCity Cam Pha, Regal Legend, Saigon Gateway. VictoryCons possesses outstanding construction capacity with a team of highly qualified and experienced personnel, equipped with advanced technology and modern equipment systems.

With each project, VictoryCons is always committed to maintaining professionalism, responsibility and dedication in each stage. We are committed to providing services that ensure progress and quality according to international ISO standards, meeting all strict requirements from investors.
The above article has helped you understand the concept of low voltage electricity , the basic components of the system, as well as how to distinguish between low voltage and high voltage electricity. To optimize the efficiency of the project, the electrical system should be deployed by a reputable and experienced contractor. VictoryCons is an M&E contractor specializing in designing and constructing low voltage electrical systems nationwide. Contact VictoryCons now for advice and the most professional service!

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