Requirements for the installation of instrument cables in hazardous explosive areas
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During safety inspections, it is often pointed out that some cables lack strain relief tubes. Do cables equipped with flame-retardant couplers still need strain relief tubes as well? I need some advice!
It has an illustrated guide; I’ll show it to you tomorrow
Another bunch of pseudo-experts. With a gland head, flexible tubes are completely unnecessary.
Could you provide the standard number for industry atlases to make it easier for everyone to learn?* ! ! !
Pseudo-expert~ With a Gran head, flexible tubes are completely unnecessary. > GB/T 50892-2013 Code for Design of Instrumentation and Control Systems in Oil and Gas Fields and Pipeline Projects > 10 Wires, Cables, and Instrumentation Piping > 10.4 Clause 11: Sealing of cable entry points is intended to prevent explosive gases from entering the instrument junction boxes or enclosures, thereby avoiding the risk of explosion and loss of the explosion-proof properties of electrical equipment. Sealing devices for cable entry points can include explosion-proof gaskets, explosion-proof sealing washers, sealing stuffing boxes, and explosion-proof sealed flexible connectors. >HG/T 20512-2014 Code for Design of Instrument Piping and Wiring > 8 Cable Laying > 8.1 8.1.12 For the cable inlets and outlets of explosion-proof field instruments, junction boxes, and local instrument panels/cabinets, cable sealing joints of the appropriate explosion-proof rating shall be used in accordance with the current standard **Code for Design of Electrical Installations in Explosive Environments** GB 50058. 8.1.13 For the protection of the cables on the outside of the cable inlets and outlets of field instruments, junction boxes, and local instrument panels (cabinets), the following two methods are recommended: 1 Continuous type: The flexible tube of the cable sealing joint is connected to the galvanized welded steel pipe. 2 Discontinuous type: cable sealing joint plus cable tray, or cable sealing joint plus galvanized welded steel pipe. Explanation of the provision: 8.1.12 The term “cable sealing joint” in this clause can generally be replaced with CABLE in engineering projects. (It’s the gland.) In practical use, armored cables can come straight out of the cable tray and be connected directly to the meter, without any need for conduit; as for fitting a flexible tube around them… Generally, the gland is used for sealing, and one just needs to choose the appropriate explosion-proof rating……
This is my personal understanding for reference only. It should be designed based on cable wiring and conduit wiring. Armored cables are not necessary for cable wiring. It is required for wiring through tubes.
Please refer to the standard catalog 12D401-3 for the installation of electrical circuits and electrical equipment in explosive hazardous environments
I wrote a long reply, and they actually told me that spamming is prohibited