High School woodshop
- Thread starter bdingman
- Start date
- Status
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Re: High School woodshop
Not typically with good housekeeping.
For Class II, NFPA 499, defines "Combustible Dusts" as "Any finely divided solid material 420 microns or less in diameter (i.e., material passing through a U.S. No. 40 Standard Sieve) that presents a fire or explosion hazard when dispersed."
This would also apply to Class III. The concern is generally the prevention of "build up."
[ September 07, 2004, 05:27 PM: Message edited by: rbalex ]
Not typically with good housekeeping.
For Class II, NFPA 499, defines "Combustible Dusts" as "Any finely divided solid material 420 microns or less in diameter (i.e., material passing through a U.S. No. 40 Standard Sieve) that presents a fire or explosion hazard when dispersed."
This would also apply to Class III. The concern is generally the prevention of "build up."
[ September 07, 2004, 05:27 PM: Message edited by: rbalex ]
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: High School woodshop
Wood dust from sawing and drilling applications is typically Class III . Wood dust from very fine sanding maybe considered "wood flour" and therefore would be Class II Group G.
Wood dust from sawing and drilling applications is typically Class III . Wood dust from very fine sanding maybe considered "wood flour" and therefore would be Class II Group G.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: High School woodshop
Sometimes our AHJs' will require "bell boxes" and WP lights....for woodworking shops
Sometimes our AHJs' will require "bell boxes" and WP lights....for woodworking shops
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
Re: High School woodshop
Classifying a high school woodshop Class III makes about as much since as classifying a residential kitchen Class I because of a gas oven. In fact, I could make a stronger case for classifying the kitchen from the fundamental definitions:
The mere presence of wood shavings doesn?t create a Class III location.
Classifying a high school woodshop Class III makes about as much since as classifying a residential kitchen Class I because of a gas oven. In fact, I could make a stronger case for classifying the kitchen from the fundamental definitions:
By the fundamental definitions, a leak in the pipeline to my clothes dryer when I first moved in to my home created a Class I Division 2 location. You can argue about whether it was a breakdown or not ? this is the kind of hair-splitting an AHJ could make.
The mere presence of wood shavings doesn?t create a Class III location.
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