Wiring method for the instrument control room
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Article 4.7 of the SH/T 3006-2012 Standard for the Design of Petrochemical Control Rooms states that this standard recommends the use of overhead cable entries, with the cable entry openings to be located below the indoor floor level (in cases where a raised floor is used in the room, the indoor floor refers to the surface beneath the raised floor). This requirement is consistent with Article 5.1.8 of the SH/T 3160-2009 Standard for the Storm Resistance Design of Petrochemical Control Rooms. Compared to underground feeders, overhead feeders have more advantages than disadvantages; they are better at preventing water, dirt, and rodents, and are also less costly. I would like to ask everyone: if the entrance for overhead power supply is required to be below the indoor floor level, is there any difference between an overhead power supply and an underground power supply? How should this be understood here? Can the incoming connection for the non-riot control room be located above the ground level?
Waiting for an experienced friend to explain it
Keep the essence and discard the dross. Now, many of the power supply methods for instruments are through overhead lines, with connections to the control room and cabinet areas being made under the eaves. It is usually more than 2 meters above the floor. For ordinary electrical cables, they are installed at a height of 500 mm to 600 mm above the floor, taking into account the cable’s load-bearing capacity and safety.
An overhead feed can be understood as being above the 0.00 elevation level, for example above 2.50 meters, while an underground feed is below the 0.00 elevation level, such as at -0.8 meters. This refers to the elevation based on the ground level where the building is located. The provision should be understood as referring to the indoor floor of the cabinet room where the cable enters and exits; this floor level is equivalent to the ground level of the building, and it can be 0.3 meters, +2.8 meters, or +18 meters