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Requirements of the selection of flame retardant cable
发布者:admin  日期:2011/3/19 13:08:14  点击:3388
the selection of flame retardant cable

requirements

1. intensive cable

dense configuration of multiple cable flame resistance, should be "bunched wires or cables burning test method", and cable configuration, needed to prevent catastrophic accidents and the principle of economic rationality, to meet suitable for the type of request.

(1) the same channel, not the non-flame retardant cable with flame retardant cable tie configuration.

(2) some time in the external role of domestic demand to maintain the fire power of the following places or loop, the cable should be implemented for surface fire with fire protection or use of cables. Such as fire alarm, emergency lighting, DC power interrupter operation and emergency shutdown of generating units and other important preservation of the power circuit; computer monitor, Dual protection, security, power and other co-channel double-loop is not isolated from each other when one of the loop.

2. the implementation of fire protection for surface cable way

fewer cables, the available fire-resistant coating, including the band and the cable or the cable through the fire tube. More cables in the same channel, the slot should be laid in fire box, and type of power cable is preferred breathable, non-flammable dust in the environment can be semi-enclosed, laid in the bridge section of the cable protection is not long, also can be fire retardant package.

in the tank farm, important public buildings in wooden structure, high temperature fire-resistant requirements and other high places, and laying the economic performance of the installation and accept the situation, can be non-flammable mineral insulated cables. Since the capacity for surface-type oil-filled cables in the public corridors, passenger tunnel, bridges, fire deal with the situation called for the implementation, can be taken to the laying of buried sand. Near high-voltage current, voltage transformers and other oil equipment, cable channel, it is desirable to seal the section of the trench cover.

3. crowded places

the security requirements of high cable channel in crowded places or close, reliable and suitable to the environment should be equipped with automatic fire detection and alarm action device. Oil-filled cables for surface supply system, fuel injection should be provided to reflect the state of automatic fire alarm and locking device. Underground cable-intensive parts of public facilities, multi-terminal settings back to the oil-filled cables and other security requirements at the high places, can be equipped with water spraying fire extinguishing and other special facilities.

both domestic and international cable fire repeatedly occurred in the United States from 1965 to 1975, a total of 1000 fire wire and cable in more than a direct loss of billions of dollars; the Japanese unit of a 600MW thermal power plant fire a cable to loss of $ 30,000,000; two of the past 10 years have been a large chemical plant fire supply lines, a burned more than 40 kilometers of cable, the losses were due to power failure 1 thermal power plant output of 30 million cable fire accidents are more frequent, losses. According to incomplete statistics, China's nearly 20 years since Pat-200 cable fire occurred, in a total direct loss of billion of indirect economic losses estimated to be about more than several billion dollars.

from 80 years onwards, China Pat-fire retardant to prevent the cable methods of research, identified by the ministry confirmed that contains the entity in carrying out a series of analog engineering combustion test conditions based on the extension of the block associated with the burning intensity of fuel efficiency, effectiveness basis having adequate characterization of the actual fire potential assessment and other combustion temperature to obtain a new understanding. In collaboration with the fire department and other parties to develop a fire-retardant materials, product diversification, extension of the cable to prevent burning, fire-resistant technology is a significant improvement.

 
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