The selection requirements of fire retardant cable

The selection requirements of fire retardant cable
1. The intensive cable
More intensive configuration cable of flame retardant, should press "into a bundle of wire and cable fire test method", and the cable is configured, needed to prevent catastrophic accidents and economic and reasonable principle, satisfies the requirement of suitable category.
(1) In the same channel, unfavorable put blame combustion and flame retardant cable joint configuration.
(2) In an external fire time domestic demand to maintain current loop and the following, exposed laying cable fire protection should be implemented or choose has the fire resistance of the cable. Such as fire, police, emergency lighting, dc power supply for the operation of breaking device and the power to save the generator emergency stop and other important loop; Computer monitoring, double double circuit relay protection, security etc and share the same channel is not isolated in one of the circuits.

2. The exposed laying cable implementation of fire protection way
Cable quantity is small, fire retardant coating available, package is added on the cable or cable to wear in the fire pipe.Flexible Cable is large, the same channel should be equipped in the fireproof trough box, and the power cable should be used ventilation type, in the absence of combustible dust environment available semi-closed, laying in the cable protection section of bridge rack is not long, also can use fire.
In oil tank area, important timberwork public buildings, and other high temperature places require high fire-resistant and installing and laying, the situation of economic performance to accept incombustible mineral insulated cable can be used. The oil-filled cable after exposed laying in the public corridor, the passenger tunnel, bridge for implementation of the fire prevention, can take sand buried laying. Near the high pressure oil equipment such as current, voltage transformer in cable trench, appropriate makes the segment trench cover seal.

3. The populated places
In the security requirements of high cable populated places or closed channels, shall be provided with suitable for environment and reliable action of the automatic fire detection alarm device. Exposed laying oil-filled cable oil supply system should be equipped with fire auto alarm and can reflect the state of the injection locking device. Underground cable densely populated parts of the public facilities, and more back into oil-filled cable terminal Settings and places of security requirement is higher, can be installed special fire control facilities such as water spray extinguishing the fire.
Cable fire both at home and abroad have occurred repeatedly, the United States in 1965 ~ 1975 of wire and cable fire, a total of more than 1000 times, direct costs hundreds of millions of dollars. A Japanese power plant 600 mw unit a cable fire, loss of $30 million; In recent 10 years in our country, there are two large chemical plant has a power supply cable fire, a burnt more than 40 kilometers electrical cable, because each blackout once all damage output 30 million power cable fire accident to occur more frequently, severe losses. According to incomplete statistics, nearly 20 years in China has appeared more than 200 cable fire, the cumulative loss of one hundred million yuan directly, affect the national economy an estimated billions of dollars more than indirect losses.
Since the 80s, China had to prevent cable fire spreading combustion method, such as scientific research, confirmed by the ministerial appraisal, including physical simulation in the series on the basis of fire test engineering conditions, to prevent secondary efficacy associated with combustion intensity, refractory effectiveness as sufficient to represent the actual assessment of possible combustion temperature and so on, obtain new knowledge. Under the fire department and so on collaborative, developed diversified flame retardant material products, cable to prevent secondary, refractory technology has remarkable progress.