Use of wires and cables in hazardous area facilities

1. Position selection should be laid in the place where the explosion is less dangerous or farther away from the source of release.

2, laying the way to choose to explosion zha Electrical hazards in the electrical lines are mainly explosion-proof steel wiring and cable wiring.

3、.Isolation Sealing When laying the channel of electrical circuit and the protective tube, cable or steel pipe passing through the partition or floor between the zones with different hazardous environment levels, the non-combustible material shall be used to block tightly.

4, the choice of wire material explosion zha hazardous environment within the scope of hazard zone 1, distribution lines should use copper conductors or cables. Multiple stranded copper core cords or stranded copper core cables should be used where there is severe vibration. Aluminum core power cables must not be used underground in coal mines.

Within the scope of zone 2 hazardous area hazard zone, the power lines shall use aluminum core conductors or cables with a cross-sectional area of ​​4 mm2 and above, and the illumination lines may use a cross-sectional area of ​​2.5 mm2. And above aluminum conductors or cables.

5. The selection of the section of insulated conductors and cable cross-sections in the zone 1 and zone 2 of the current-carrying capacity shall be allowed. The allowable ampacity of the conductor shall not be less than 1.25 times the rated current of the fuse melt rated current and the breaker time delay overcurrent release. The allowable ampacity for the branch line leading to the low-pressure cage induction motor shall not be less than 1.25 times the rated current of the motor.

6. Electrical connections The intermediate connections of the electrical circuits in zones 1 and 2 must be internal to the explosion-proof junction boxes or splice enclosures that are compatible with the hazardous environment. Zone 1 should be flameproof junction box, and zone 2 can be increased safety junction box.

When using aluminum core cables or conductors in the electrical circuit in Zone 2, it must be reliable so that the user can correctly install and repair it.