Recently, the two cities of Pennsylvania, Ambler and Sunbury, have announced their participation in the Cree LED City Program, an international project to promote and deploy energy-efficient LED lighting. The streetlights in both cities have been replaced with LED streetlights, which are manufactured by Spring City EL ectrical Manufacturing Company and use Cree's XLamp MC-E and XP-E LEDs.
A decorative urban LED streetlight has been installed along the track in downtown Ambler, 15 miles north of Philadelphia. Each street lamp has a maximum power of 74W and emits a light source equivalent to a 150W high pressure sodium lamp. Spring City expects 60% energy savings per LED streetlight, and can save $15 in annual maintenance costs or $100 per year in installation costs.
Recently, the city of Sunbury on the banks of the Susquehanna River has completed the installation of 10 Washington-style LED street lights, with an expected energy savings of 43% compared to conventional metal halide lamps. Sunbury City officials predict that LED luminaires will save $29 per luminaire per year and, overall, $290 per year. (http://?i=1281015820767)
A weak electrical cable is a cable used for security communications, electrical equipment, and related weak electrical transmissions.
Wire and cable refers to materials used in power, communications, and related transmission applications. There are no strict boundaries between "wires" and "cables." Generally, a product with a small number of cores, a small product diameter, and a simple structure is called a wire, a non-insulated wire is called a bare wire, and the other is called a cable; a conductor having a large cross-sectional area (greater than 6 square millimeters) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire, and insulated wire is also called a wire.
Wire and cable mainly includes bare wires, electromagnetic wires and insulated wires for electrical appliances, power cables, communication cables and optical cables.
composition
It consists of an inner conductor, an insulation, an outer conductor and a sheath from the inside out;
Inner conductor: Since the attenuation is mainly caused by the resistance of the inner conductor, the inner conductor has a great influence on the signal transmission.
Insulation: affects attenuation, resistance, return loss and other properties
Outer conductor: return conductor, shielding
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