Cable trays can be laid on the same rack as process
pipelines, without occupying a separate cable channel, saving space, and at the
same time avoiding the problem of intersection with underground pipelines.
Cables are laid in the air, and the heat dissipation
conditions are better than those in cable tunnels. There is no need for
ventilation and drainage, and the operation cost is low. Once a cable failure
occurs, it is also very convenient to deal with.
When the device is expanded, the newly added cables
can make full use of the spare positions of the cable tray, which is very
convenient.
With the increasing improvement of fire alarm series
products, a cable detector can be used to monitor the cables. Once the
temperature at a certain place is too high and exceeds the set value of the
detector, it can send an alarm in a timely manner, enabling the duty personnel
to conduct inspections in a timely manner, eliminate potential hazards, and
prevent accidents.
Compared with other cable laying methods, cable trays
have obvious advantages. Whether it is the main trunk line in the factory area
or the wiring in a certain device, the cable tray laying method can be adopted.
Although the civil engineering cost of direct cable burial is relatively low,
it occupies a large area. When adding cables during device expansion, it is
necessary to excavate again. Cables are often damaged due to expansion
construction, resulting in power outages, and it is difficult to deal with the
accidents. It takes a long time to restore power supply. When directly burying
cables, armored cables need to be selected, which are more expensive than
ordinary cables and are not convenient for bending. Although the cable trench
scheme has a certain degree of flexibility compared with direct cable burial,
most petrochemical enterprises are flammable and explosive places. Cable
trenches are prone to accumulating dangerous gases, creating potential hazards.
Moreover, most of the surface water in chemical plants contains chemical
materials. Over time, it will inevitably pollute the cable trench. The cable
trench is generally about one meter deep with a cover plate, which is
inconvenient for personnel inspections. Although the cable tunnel has the
characteristics of being convenient for maintenance and adding cables, since it
is located underground, there are many cables and the heat dissipation
conditions are poor. Generally, forced ventilation is required, and it is
constantly troubled by leakage and needs to be drained regularly, resulting in
high operation costs. The cable tunnel can only be used in areas where cables
are concentrated. After the cables are led out, the direct burial or cable
trench method still needs to be adopted, inevitably presenting the
disadvantages of this method again.
