Building electrical systems encompass a wide range of components, including power supply and distribution systems, lighting systems, disaster mitigation systems (such as safe electricity use, lightning protection, grounding, fire prevention, anti-theft, air defense, and explosion-proof measures), information systems (like television, radio, audio, network, and computer management systems), and building automation. These systems are essential for the safe and efficient operation of any structure.
Strong electrical systems involve power supply, distribution, lighting, control systems, lightning protection, and wiring. On the other hand, weak electrical systems include automatic fire alarm and fire linkage systems, security systems, communication networks, information networks, integrated wiring systems, and TV systems, along with building automation.
The power supply system is a critical part of electrical infrastructure. The rated voltage levels in power transmission lines vary, such as AC 500, 330, 220, 110, 66, 35, 10 (6) kV, and 380/220V, as well as DC 500kV. A key distinction between high and low voltage is 1000V. In industrial and civil buildings, common voltages are 10kV and 380/220V.
Power loads are classified into three levels based on reliability requirements and potential consequences of power interruption. Primary loads require two independent circuits from different sources, while special primary loads need an emergency power supply, such as generators, dedicated feeders, batteries, or dry cells. Secondary loads should also be supplied by two circuits.
Electrical loads are generally divided into lighting and power loads. In residential buildings, HVAC and electric heating equipment are considered lighting loads, while elevators, water pumps, fans, and washing machines fall under power loads. Voltage selection and power factor correction are crucial for efficient energy use. For installations under 250kW or transformers below 160kVA, low-voltage supply is typically used. High-voltage systems must maintain a power factor above 0.9, while low-voltage systems should have a power factor above 0.85.
Substations and backup power systems play a vital role in maintaining continuous power supply. Transformers can be oil-immersed or dry-type, with diesel generators commonly used for emergency power. Substation locations must avoid areas with vibrations, high temperatures, dust, moisture, or corrosive gases. They should not be placed directly beneath bathrooms or near water accumulation zones, especially in basements. Fire resistance ratings and proper layout are essential for safety and compliance.
Outdoor wiring includes overhead lines and cable routes. Overhead lines must maintain specific distances from the ground, and dual power lines for primary loads should not share poles. Cables can be buried directly, laid in trenches, tunnels, or conduits, depending on the number of cables and site conditions. Indoor wiring methods vary, including metal pipes, hard plastic pipes, and direct wiring, with specific regulations to prevent hazards.
Lighting systems are categorized into general, local, and hybrid lighting. Types include normal, emergency, duty, security, landscape, and obstacle lights. Emergency lighting must provide at least two hours of continuous power, and illumination uniformity should not be less than 0.7, with a color rendering index of at least 80.
Electrical safety involves understanding safe current levels and implementing protective measures like leakage current protection and total equipotential bonding. Lightning protection systems classify buildings into three categories, with specific measures for each, including lightning rods, down conductors, and grounding devices. Internal protection includes shielding, surge arresters, and proper wiring.
Fire alarm systems are essential for early detection and response. They are classified into special, first, and second grades, with detectors installed in most areas except unsuitable spaces. Emergency broadcasts and fire telephones ensure clear communication during emergencies. Fire control rooms must be located on the first floor or basement, with appropriate fire resistance and access.
Communication systems include telephone stations, cable broadcasting, sound reinforcement, and closed-circuit television. Integrated wiring systems support smart buildings, combining automation, communication, and office systems. Horizontal cabling must not exceed 90 meters, and vertical channels are typically managed via cable shafts.
Electricity is measured in kilowatts (kW) or "degrees," with meters used to track consumption. Understanding these systems ensures the safe, efficient, and reliable operation of modern buildings.
Wireless Par Light
Wireless Battery Par Lights Series
Â
It is built with D-Fi transceiver. This wireless battery led light can be controlled by wireless DMX or IR remote controller. It's convenient for home parties, events, and any other places requiring a small fixture lighting up the venue. Shine light where it is needed using the built-in adjustable kickstand and prevent light spillage with the built-in glare shield.
DMX cables can be removed, wireless connection is available without any signal interference. With in-built lion battery, power cables can be removed, each light can be placed seperately without any cable connection, while they are wirelessly connected for the controlling. The charging time is about five hours, while working time reaches 8-12 hours. It is small in size: 15*14*23cm, stuitable for lighting up a truss.
Â
Our company have 13 years experience of LED Display and Stage Lights , our company mainly produce Indoor Rental LED Display, Outdoor Rental LED Display, Transparent LED Display,Indoor Fixed Indoor LED Display, Outdoor Fixed LED Display, Poster LED Display , Dance Led Display... In additional, we also produce stage lights, such as beam lights Series, moving head lights Series, LED Par Light Series and son on...
Wireless Battery Par Light Series,Beam 230 7r,Stage Beam Light,Moving Head Stage Lights
Guangzhou Chengwen Photoelectric Technology co.,ltd , https://www.cwleddisplay.com