Estimation of instrument branch trunking and its elbows
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The number of main cable trays and elbows can be measured and counted from the drawings, but how can the widths of the 100 and 50 mm branch trunking boxes from the junction box to the instruments be estimated? How many upper elbows, lower elbows, and tees are needed? ? ?
What do you think? Count them one by one; otherwise, why would we need you to design them?
Since the layout diagram for the branch slot boxes hasn’t been designed yet, how can we count them? Under normal circumstances, design institutes do not provide layout drawings for branch trunking boxes.
It’s impossible to count without the drawings; not all design drawings need to be made public. Do I really have to let others see the database that’s included in my drawings?
The orientation of the small junction boxes is determined by the construction team based on the actual conditions on site; the design usually does not specify such details. It is recommended to provide the construction team with the instrument layout diagram so that they can estimate the required quantity. You can also do your own estimation. In areas where instruments are concentrated, a length of 200 or 100 units per run is typical. Generally, the junction boxes start from the wiring box, go upward to above the instruments, then descend again to below those instruments. There should be two upward bends and two downward bends. The total length, including any height differences and distances, should be multiplied by 1.1 as a margin
Instrumentation is generally not detailed to such an extent; instead, a certain number of small box sections are provided, and the wiring is carried out on site according to the actual conditions. If no specific quantity is given, then one cable is used for the layer with the most instruments. Add some extra amount at the end.