Selection and Wiring Measures for Fire Electrical Circuits

Only need to meet the use of non-fire conditions, the general power system. Therefore, it can be selected according to the general requirements. The power supply circuit for fire-fighting electrical equipment must satisfy the continuous power supply time of fire-fighting equipment in the event of a fire and ensure the integrity of the line and the normal operation of the system. At the same time, fire hazards of wires and cables must be taken into consideration to prevent them from becoming a source of fire due to short-circuit and overload. The effect of external fires should not contribute to the spread of fire, and it can effectively reduce harmful gases that decompose organic insulation layers and prevent “secondary disasters”. occur.
Selection of Non-Fire Electrical Circuits
Can use ordinary wire; buried laying and wearing tube concealer, 1 ordinary equipment line pipe laying. Can use ordinary cable;
Fire-retardant wire and cable should be used; 2 wire and cable bundles laying.
The wire and cable used in the secondary site should adopt the halogen-free and low-smoke type; 3 the wire and cable used in the special class and the first-class place should adopt the halogen-free low-smoke type.
The main power line of special grade, especially important load in the first class place, 4 is used for the wooden structure public building. Mineral insulated cables should be used.
Selection of fire electrical circuit
Fire-resistant wires or mineral insulated cables shall be used; when the wires are applied in the metal wire troughs in an open or metal pipe, and flame-retardant rigid plastic pipes are concealed, 1 the fire-fighting equipment takes a long time (≥1h. When applying, flame-retardant and fire-resistant wires shall be used; when the wires are applied in the refractory metal troughs or metal pipes coated with fire-retardant paint, flame-retardant wires may be used; The main power line of fire equipment should be fire-retardant fire-resistant cable or mineral insulated cable;
General wire and cable can be used; 2 Longer power consumption (≤1h mineral insulated cable can be used for distribution line surface coating; wall thickness (maintaining layer thickness should not be less than 30mm dark, fireproof cable tray laying or mica insulation fireproof cable is closed Metal bridge when laying.
Mica insulated fire-resistant cable is laid out in an open position, and 3 electricity consumption time is short (<20min distribution line wears metal pipe or enclosed metal trunking and is coated with fire retardant coating. General wire and cable can be used.
Fire-fighting equipment electrical wiring measures
To ensure the integrity of the distribution line, fire resistance. In accordance with the relevant technical regulations, fire-fighting equipment should be designed with fire-resistant and heat-resistant wiring. The selection of conductor cross-section should be appropriately relaxed to prevent the increase of the conductor resistance due to the increase of the ambient temperature during the fire, resulting in an increase in the pressure drop, which will affect the function of the fire-fighting equipment.
Use ordinary wire and cable to wear metal pipe or flame-retardant rigid plastic pipe (Oxygen index 30 is buried in the non-combustion body structure, 1 when the line is darkly laid, and the pipe is protected by dark protection (layer thickness 30ram
Wear metal pipe or metal fire retardant paint to improve the line's flame resistance, 2 when the line is laid. Or directly use flame-retardant wire and cable and copper trunk protection, and should use skin- fired cables, etc., and laying in closed cable trunks with fire prevention measures in the cable shaft or ceiling;
The two are separated by fire-resistance data; 3 When the distribution line is insulated and sheathed with non-flammable cables and laid in the well (while metal trough sealing is used at the same time), metal tube protection may not be used; but when When the cable is laid in the same shaft.
Can use flame-retardant type (oxygen index 50 rigid plastic pipe, plastic trunking wiring; 4 fire protection electrical circuit within the ceiling of the building using metal pipe or metal trunking wiring; within the flame-retardant data ceiling.
The distribution line that is protected by the metal pipe can be laid tightly against the outer wall of the air pipe. When there is flammable material in the muffled roof, the 5 distribution line must not pass through the inner cavity of the air duct or be laid on the outer wall of the air duct. Its distribution lines should be protected by metal tubes.

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