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What classification is this location? #19243
12/22/02 10:18 AM
12/22/02 10:18 AM
Edward  Offline OP
Joined: Dec 2002
Posts: 308
I am working in a warehouse/production warehouse where the company makes wooden garage doors. There are many table saws,dust collectors,routers,sanders...Anotherwords it is a huge wood working shop.
What class is this location classified?
Class1,2 or 3?

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Re: What classification is this location? #19244
12/22/02 08:33 PM
12/22/02 08:33 PM
dana1028  Offline
Joined: Jan 2002
Posts: 163
San Carlos, CA
prob. class II

(1999) 500-8 Class II Locations: 'are those that are hazardous because of the presence of combustible dust....see 500-8(a) & (b) for Div. 1 & 2 conditions.... Art. 502 then gets into the wiring methods for each division.

Re: What classification is this location? #19245
12/23/02 01:34 PM
12/23/02 01:34 PM
JBD  Offline
Joined: Jul 2001
Posts: 599
Normal saw dust is not enough to justfy a Class II environment.

We have a door manufacturer, down the road, and nothing in the production area is "explosion-proof" rated.

However, we let the local fire department determine all of our classifications.

Re: What classification is this location? #19246
12/23/02 09:24 PM
12/23/02 09:24 PM
Mike Wescoatt  Offline
Joined: Jun 2001
Posts: 161
Cedar City, Utah
In our wood and metal shops we don't have any special requirements set by the Fire Marshall, but we take it an extra step and make everything NEMA 3 or better; no NEMA 1 enclosures. We do have dust collection and fume extraction, though.

Mike Wescoatt
Re: What classification is this location? #19247
12/24/02 09:05 PM
12/24/02 09:05 PM
nesparky  Offline
Joined: Jun 2001
Posts: 642
This depends on several factors Number of air changes/minute, is the dust collected and routed away from electrical equipment, layout of the equipment, etc.
This is why we ask the fire marshal to make the determination. They usually can get the designers to do all the engineering necessary to properly make the call. The fire marshal's office usually has a big enough hammer to get this done- if they care to.



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