The bearing capacity and load of cable trays

When installing indoors, in order to ensure the flatness, aesthetics, and uniformity of the cable tray, its horizontal load deformation should generally be controlled within 4 millimeters. We can search for the corresponding structural form of the cable tray load characteristic curve based on the selected cable tray width and the required horizontal load deformation of the cable tray. If the deformation requirements cannot be met, the side height of the cable tray can be appropriately increased or the support spacing can be reduced to meet the requirements.

Cable tray is made of thin steel plate stamping, with limited bearing capacity. It will deform due to overloading of the tray, which not only affects the appearance of the tray, but also affects the safe operation of the cable. In general, the bearing capacity of cable trays is represented by the load characteristic curve of cable trays. From the load curve graph, it can be seen that the magnitude of its load capacity is related to the specifications and support distance of the cable tray, corresponding to the same support distance and bending convex deformation. The side height is high and the bearing capacity is large. When the load capacity is the same, the bending deformation of cable trays of the same specification with small support distance is small.

We all know that the load of cable trays is mainly divided into three aspects: load, dynamic load, and additional load. So, what are the specific differences and characteristics of these three types of loads?

In fact, static load refers to the various types and numbers of cables laid in cable trays, as well as the outer diameter weight/unit length of each cable. These basic parameters must be strictly calculated according to the different routes of cable laying. Dynamic load refers to the weight of construction and maintenance personnel during the installation and maintenance process of cable trays. In fact, for light cable trays, we generally do not consider dynamic load, which means that it is not allowed to stand on the tray. If it is necessary to consider the situation of standing people, the span should be appropriately reduced. The additional load only refers to the load formed by ice, snow, wind, and electromagnetic forces outdoors, which is related to the natural meteorological conditions of the installation site and the properties of the charged body. Corresponding calculations should also be made in the design based on their conditions.