Choosing the Correct Size Cable > 자유게시판

Thin strands of glass or plastic form the basic composition in these types of cables. Fibre Optic Cable: Fibre optic cables use strands of glass or plastic fibres to transmit data in the form of light. A thick wire or a set of wires in a plastic or rubber covering is used to carry electricity for transmission & distribution to homes, industries, etc is known as cable or electric cable. Generally, electrical cables & wires are considered as same but they are somewhat different. Additionally, poor conductors reduce the cables conducting ability, which can result in a drop in voltage that eventually shortens the lifespan of electrical appliances or makes them work less optimally. Environment: cables installed in places where they’re continually exposed to high temperatures can degrade the insulating material, causing the exposed live conductors to come into contact with foreign conducting objects or materials, sparking a short circuit. These are made from high conducting metals like Copper and Aluminum which have low resistance and can be used for high voltage applications. Simply specifying low smoke cables to common British or IEC standards then thinking this will provide a low smoke environment during a real fire may unfortunately, in practice, be of little help for the people actually involved.

In these environments, more stringent test protocols for fire resistance including for electric cable systems may need to be specified by designers.. However, any wiring system (cable or bus duct) required to operate in fire must not only account for the electrical integrity of the circuit in order to ensure the reliable function of the life safety and firefighting equipment connected but also for the effects of fire on voltage drop, reduced conductor conductivity due to increased conductor resistance at fire temperatures and the additional ohmic heating generated by carrying the required load under these conditions. Fire experts tell us most fire related deaths in buildings are caused by smoke inhalation, temperature rise and oxygen depletion or by trauma caused by jumping in trying to escape these effects. It should be noted that national standards and building regulations are drafted as minimum general requirements and that should a building, project, or environment be known to have more demanding emergency conditions or fire risk than considered in the standards, then it may be the responsibility of the professional engineer and project owners to require additional performances.

It is well known the hotter a material is the more easily it will burn so designers and users of cables that claim to meet these standards may be surprised to learn their cables might not be flame retardant at all when installed and used at their rated operating temperature. Discover the different types of electrical flexes and cables that might be used in your home's wiring and how to protect them against overheating under loft or wall insulation. High currents to power loads and appliances on the extension cords can lead to increased stress on the cable, making the insulation porous and at risk of smouldering. Overloading can be a result of having fully loaded sockets and splitting or branching sockets through extension cords and extra socket strips. That way, when you find a cable during a project or while online browsing, you can know the correct environment to use it in. The copper jacket, magnesium oxide insulation and copper conductors of MICC cables ensure the cable is effectively fireproof.

Insulation: checking for frayed, kinked, or crushed insulation on the cables is important. Overhead cables are cheaper because they do not have the problems with the inclusion of insulation material and the required properties in their manufacturing process. To provide cables which are halogen free, cable makers most often choose polymers like polyethylene (PE & XLPE) because it is easy to process and cheap however, although polyethylene is halogen free it has a naturally high fire load. Enclosing cables in steel conduit will reduce flame propagation at the point of fire but hydrocarbon based combustion gasses and smoke from the decomposing polymers will propagate along the inside of conduits to switchboards, distribution boards and junction boxes in other parts of the building where any spark such as the opening or closing of circuit breakers, or contactors is likely to ignite the combustible gasses leading to ignition or even explosion and spreading of the fire and smoke to other locations. Even though electrical cables are hidden within the walls of our home or office, these wires play an essential role in your daily life. Unlike other cables, fire resistant cables have to work even when directly exposed to the fire to keep essential equipment working: Fire alarms, Emergency Lighting, Emergency Voice Communication, Fire Sprinkler pumps, Fireman’s Lift sub-main, Smoke extraction fans, Smoke dampers and shutters, Stair pressurization fans, Emergency Generator circuits etc..

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