I would like to ask for guidance on how to interpret certain provisions in GB 50054-95
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Dear seniors, I am just starting out in the field of design. While reading the \"Code for Design of Low-Voltage Power Distribution GB 50054-95\", I came across a clause: \"Article 3.1.6: For two busbars installed side by side in the same distribution room, if either of these busbars carries first-class loads, fire separation measures should be installed at the point where the busbars meet.\" ”I don’t know how to create this partition Do modern switchgear cabinets already have partitioning capabilities (between cabinets), so that no additional fire barriers are needed? I hope the seniors here can help answer this. Thank you!
I’ve noticed this issue for the first time. I have done projects with first-class load requirements before. They really didn’t consider this issue: L
Is it something like a firewall or isolation barrier?
I really haven’t thought about this issue yet; I’ll ask the manufacturer about the situation.
After looking at the explanation of the provisions, I personally think it doesn’t refer to how to use cabinets as partitions. Article 3.1.6: This provision is one of the measures taken to enhance the reliability of power supply for first-class loads. In the event of a fire caused by a fault in a busbar carrying first-class loads, the busbars carrying first-class loads can be protected from being directly affected or only minimally affected thanks to such partitions. These partitions can be made of fire-resistant materials or walls; when the wall is a solid structure, doors should be provided in it.
I couldn’t find any proper explanatory text yesterday; thank you! If partitioning measures are not taken on the cabinets, then are fire barriers (such as firewalls) installed at the sections where the busbars meet at both ends? But as far as I remember, it seems that few substation facilities do this~
From preliminary investigations, it turns out that the use of partitions or walls is a practice that dates back to long ago; in those times, the busbars were exposed, which is why such methods were employed； However, it is said that with cabinets equipped with metal shielding, there is no need for any partitions or walls. If you have any other opinions, please keep participating actively in the discussion! Thank you all for your active participation; I am extremely grateful!
Closed busbar cabinets now come equipped with isolating switches, so it seems there is no need to worry about sealing issues between cabinets; however, the incoming cables must be fire-sealed.
It’s probably because the standards are too old; the busbar cabinet already has an isolation function. . Regarding the current situation, the minimum distance between the two busbars is 2.8 meters, so the distance is no problem. .
For the issue you mentioned, this is usually how we handle it: for systems of 35 KV and below, we install fire isolation panels on the busbar cabinets； GIS systems are used for 110KV and above systems, with built-in isolation!
Actually, even after looking at it, I still don’t understand it. . But those I’ve done didn’t include this. .
“Now the minimum distance between the two busbars is 2.8 meters”?? What does this mean? ? :loveliness:
Learning something new.............