Series of Posts on Preventing Common Problems in Instrument Installation (Twelve)
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Series of Posts on Preventing Common Problems in Instrument Installation (Part 12): We invite fellow enthusiasts to actively participate in the discussion of these issues. Constructive suggestions will be rewarded generously; having relevant images will earn additional points as a bonus. By sharing such problems and their solutions, we can avoid similar issues arising in future installations and create a favorable environment for maintenance work. Thank you! Common problems in cable installation: 12. Cable lines for instrument signals, instrument power supply, safety interlock circuits, compensation wires, and intrinsically safe instrument circuits are installed in the same conduit; the compensation wires are laid directly underground. l Analysis and prevention: Instrument cables must be run in separate conduits and laid separately; one protective conduit can only accommodate one cable. It is strictly prohibited to run instrument signal circuits, instrument power supply circuits, safety interlock circuits, compensation wires, intrinsically safe instrument circuits, and other special instrument circuits in the same protective conduit. Compensation wires should be placed in protective tubes or laid in cable trays; they should not be buried directly in the ground.
A protective tube can only accommodate one cable – that’s nonsense; no standard requires such a thing. Stop posting this stuff right away.
It’s a bit rough, but I agree
Unless it is a large protection tube, on-site there is usually one protection tube and one cable； Can’t pipes of the same type and signal category be placed in the same buried pipe, like those temporary buried pipes? The main thing is to run the power cables and signal cables in separate conduits, with DC and AC cables also kept separate.