grounding electrode in hazardous area
grounding electrode in hazardous area
(OP)
is it allowed to design vertical grounding electrode in hazardous area of methane gase
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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grounding electrode in hazardous area
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RE: grounding electrode in hazardous area
RE: grounding electrode in hazardous area
See: Grounding and bonding practices for hazardous areas
http://www.csemag.com/article/CA6578953.html
RE: grounding electrode in hazardous area
Nonsense: hazardous areas exist outside in numerous plants.
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If we learn from our mistakes I'm getting a great education!
RE: grounding electrode in hazardous area
RE: grounding electrode in hazardous area
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If we learn from our mistakes I'm getting a great education!
RE: grounding electrode in hazardous area
On partially open area-let's say confined area- the floor is concrete and I don't recommend hiding electrode under this concrete. One could make a foundation grounding [Uffer].
Nevertheless this is only a rhetoric issue since the grounding grid is not only permitted but very recommended in all type of location-hazardous or not.
As the grid is buried about 2-2.5 feet under the ground no hazard will occur even in case of a shortcircuit. If somebody would be afraid of temperature arise during a shortcircuit he could dimension the copper for 80% of maximum admissible temperature-auto ignition temperature of methane being 580 -could be 580*.8=464 degrees C –and welded connections [brazed or cadwelded].
RE: grounding electrode in hazardous area
I agree that the buried grid presents a minimal ignition risk, but it is an interesting and very valid point regarding the temperature rise of a conductor under fault conditions. I do not recall an explicit reference to such circumstances in the UK regulations - I will have to check when I am back at work.
I can not agree that open air installations are not hazardous. An ATEX Zone 0 outdoor area is unusual, but Zone 1 and Zone 2 areas are very common in outdoor installations in plants fuelled by natural gas or by the lighter distillate fuels such as naphtha.
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If we learn from our mistakes I'm getting a great education!