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Wiring a Grain Elevator

In some areas, grain elevators are the tallest thing around, making them perfect for fixed wireless networks. Members of the ISP-Wireless list discuss dealing with the fact that, under certain conditions, grain dust in a grain elevator can be as explosive as gasoline.

[August 17, 2000]

On the ISP-Wireless list in July, DM asked,

"We have an opportunity to lease rooftop space on some grain elevators, but the owner wants to make sure it's safe and legal, with no explosion hazard. Any advice?"

Some respondents felt the situation doesn't require special attention:

[CO noted] "We have stuff on a feed mill just like this. I'm not sure what you can do in the way of certifications or anything, but it's certainly safe. Grain dust is less of an explosive threat than a danger to your equipment. You're going to want to have your stuff very well sealed off from the dust; I'd recommend putting it outside if possible."

[BM added] "If you install all of your equipment and wiring where it doesn't pose a threat of ignition under normal operating conditions, then equipment can be housed in normal, standard enclosures and conduit."

[MKS recounted] "I did it here. Talked to the local electrical inspector first; he said that as long as all my stuff was outside I'd be fine."

Others warned that major precautions are necessary:

[LN warned] "Grain dust is like natural gas. Any arcing could cause a very major explosion. One option would be to keep all lines outside the structure, but I'm not an expert on explosive situations. Maybe you should seek advice from someone involved in grain elevator safety. I'm sure it wouldn't cost a great deal of money, and could save a lot of grief."

[II added] "Do not take just anyone's advice. Talk to an electrical contractor or inspector; don't just start running cables down the shaft. Dust can be highly explosive."

[JS agreed] "Static build-up was the cause of a fatal accident in Kansas a few years back. Most of the co-ops have their own experts; consult with them."

 —End