Regarding the grounding of flammable and toxic gas alarms in explosion-proof areas?
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Recently, company security experts conducted mutual inspections in different locations, and they pointed out that the combustible gas alarms installed in the production facilities did not have grounding wires. However, I checked GB50160, GB50493/SH3081-2003T, but could find no relevant requirements in them. I’m asking those who are more knowledgeable if they are aware of any relevant standards or regulations.
You haven’t found the standard yet; another standard is the standard for toxicity and flammability
Standards specifically for toxic and flammable substances
This post was last edited by sdlyml on 2020-5-12 09:26. SHT 3081-2019 \"Code for Design of Grounding of Instrumentation in Petrochemical Industries\": 4.1.5 In explosive gas environments, the metal enclosures, metal protective boxes, and metal wiring boxes of field instruments in non-intrinsically safe systems shall be provided with protective grounding, whereas such enclosures, protective boxes, and wiring boxes for field instruments in intrinsically safe systems need not have protective grounding.
Isn’t it GB50493?
Yeah, I checked it yesterday – it’s here. Grounding is required for everything that isn’t intrinsically safe; it’s a big project.
This standard is chaotic; automated instruments specify that those operating at 36V or below do not require installation. Otherwise, how can one even look around this workshop? There are wires everywhere
24V is a safe voltage; no grounding is needed, right?
When the equipment is located in a hazardous area, the primary standard applicable is GB50058-2014, the Code for Design of Electrical Installations in Explosive Atmospheres; refer to the provisions in 5.5.2/5.5.3.
Requirements for the installation and use of flameproof combustible/toxic gas alarm detectors: The product’s enclosure is equipped with grounding terminals, and users must ensure proper grounding when using the device (when the power supply voltage is greater than 36V, the internal grounding must be securely connected). So it depends on the explosion-proof rating of the combustible/toxic gas detector you are using, as well as whether it is used in a hazardous area classified as Zone 1 or below for combustible gases
What the expert suggested is fine. Grounding it as required will do.