Cable tray bridging
Thread Content
May I ask in what situations are the trough-type, tray-type, and ladder-type cable trays used respectively? How to choose? Also, what is the difference between a cable tray that is 6 meters long in one piece and one that is made by combining three 2-meter-long sections?
Instrument signal cables use tray-type designs for outdoor use (with drainage holes), and trough-type designs for indoor use (without drainage holes). Considering heat dissipation for the motor power cable, a tray-type design is chosen. The large-span pallets, with a length of 6 meters per section, can be supported every 6 meters (according to the SH specifications, it depends on the manufacturer’s data; if the manufacturer specifies a support interval of 6 meters, then that is the appropriate spacing). For those made by splicing 3 pieces of 2 meters each, they can basically only support a load of 2 meters.
Most manufacturers’ trough and pallet products have a span of 2m. There is no fundamental difference between slot-type and tray-type; in my opinion, it’s just a matter of convention in different industries. Building code manuals use the slot-type, while the general industrial sector prefers the tray-type. The ladder type is suitable for main path trunking for power cables and control cables, but not for signal cables. .
The difference between the tray type and the trough type lies in the fact that the bottom of the tray rack has cooling holes, while the trough type is closed; there are no other differences； Ladder-type racks are mainly used for laying large power cables; they can also be employed in environments with a lot of dust, as they are less prone to dust accumulation. As for each span, the focus is mainly on the support and fixing spacing; specific details depend on the manufacturer’s specifications. Additionally, pay attention to the grounding connections between various spans.
Slung type is used for instrument cables, while ladder type is used for electrical purposes; this is a fairly common arrangement. One of the advantages of slot-type designs is that the signal cables are smaller and do not hang down; that’s my personal opinion: lol. Ladder-type cables are used for power cables, which helps save costs; power cables are generally thick and do not sag. :Lol, of course the cooling is better too. :lol
Segmented cable trays require bridging.
For long distances, 6-meter cable trays are chosen as they are easy to install and help save costs. On the other hand, choose 2 meters
Instrument signal cables use tray-type designs for outdoor use (with drainage holes), and trough-type designs for indoor use (without drainage holes). Considering heat dissipation for the motor power cable, a tray-type design is chosen. The large-span pallets, with a length of 6 meters per section, can be supported every 6 meters (according to the SH specifications, it depends on the manufacturer’s data; if the manufacturer specifies a support interval of 6 meters, then that is the appropriate spacing). For those made by splicing 3 pieces of 2 meters each, they can basically only support a load of 2 meters.