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The fire-retardant properties of multiple densely-configured cables should be in accordance with the "Bundle Wire and Cable Burning Test Method", as well as the cable configuration, the need to prevent catastrophic accidents, and economical and reasonable principles to meet the applicable category requirements.
The following locations or circuits to be energized shall be maintained for a certain period of time during the action of an external fire. The cable of the surface coating shall be fire-resistant or be of a fire-resistant type. Such as fire protection, alarm, emergency lighting, interrupter operation of DC power supply and emergency shutdown of the generator set, such as the maintenance of important circuits; computer monitoring, dual relay protection, security power supply and other dual circuits when the same channel is not isolated when one of the loop.
2. Ming Fu cable implementation of fire protection
When the number of cables is small, fireproof coatings, tapes may be added to the cables or the cables may be worn in the refractory pipes. When there are many cables in the same channel, it should be laid in the fireproof trough box, and the power cable should adopt the air-breathing type, semi-closed type can be used in the environment without flammable dust, and the cable protection section laid on the bridge is not long. Fire blocking package can be used.
In non-flammable mineral insulated cables, other refractory requirements such as tank farms, important wooden structures, public buildings, and high-temperature locations may be used for laying and economical performance. Self-contained oil-filled cables can be buried in sand when they are applied to fire protection in public corridors, passenger tunnels, and bridges. Close to the cable trench of oil-containing equipment such as high-voltage current and voltage transformer, the section of the trench cover plate should be sealed.
3. Intensive places
In high-security cable-intensive places or enclosed passages, fire automatic detection and alarm devices suitable for reliable operation of the environment shall be provided. The oil supply system of the oil-filled cable for the Mingshi should be equipped with an automatic fire alarm and locking device that can reflect the state of fuel injection. Underground facilities such as cable-dense parts, terminals with multiple oil-filled cable terminals, and other places with high safety requirements may be equipped with special firefighting facilities such as water spray fire extinguishing.