Class B ceiling install. Ceiling is sloped

[Fordean]

I have a Garage with 80 x 80 flat ceiling. From the Bottom of Deck to 18 inches is Class B for Natural gas. I have no problems Here I can understand the 18 inches definition.

Problem is the Slope roof. Is it along the whole slope 18 inches. Or just 18 inches at the peak. I am install Trapeze at 24. Below peak. EMT where they will be below the 18 Inch Class B area.

 

[rbalex]

To be honest, I have no idea what you mean about Class B in relationship to classifying your locations. Natural gas is Group D.

That said, the right-hand figure in your third diagram would be correct; i.e., the 18" would be measured from the peak. If properly ventilated, it may not need to be classified at all. See Table 511.3(D).

 

[Fordean]

To be honest, I have no idea what you mean about Class B in relationship to classifying your locations. Natural gas is Group D.

That said, the right-hand figure in your third diagram would be correct; i.e., the 18" would be measured from the peak. If properly ventilated, it may not need to be classified at all. See Table 511.3(D).

Acuttally better said Class 1 Division 2 Class b was a term I learned in the early 90s Stuck with me

 

[Fordean]

Can a moderator move this to engineering education Need a viable answer please
Ty

 

[don_resqcapt19]

Can a moderator move this to engineering education Need a viable answer please
Ty

This is a classified area question and it is in the correct place.

You were give the answer in post 2 by one of the foremost experts in classified areas.

 

[Fordean]

My apoligizes Didnt see that On small cell phine screen

Ty