Electrical Riser Rooms

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ron said:
300.21
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Agree
circumstances have all electrical riser rooms stacked directly above each other --- all walls have appropriate fire ratings from floor deck to ceiling deck (typically concrete over steel decking) -- are penetrations thru floor/ceiling decks considered to be penetrating a fire rated assembly?
 
mwm1752 said:
Agree
circumstances have all electrical riser rooms stacked directly above each other --- all walls have appropriate fire ratings from floor deck to ceiling deck (typically concrete over steel decking) -- are penetrations thru floor/ceiling decks considered to be penetrating a fire rated assembly?
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Yes, if the floor/ceiling decks are indeed fire rated assemblies, which is virtually certain.
 
What is by definition with walls rated as such would create a shaft -- A shaft could have any type of floor/ceiling platform (corregated steel) that would not be rated so why would the choice of using a concrete decking type floor/ceiling have to be rated?
 
mwm1752 said:
What is by definition with walls rated as such would create a shaft -- A shaft could have any type of floor/ceiling platform (corregated steel) that would not be rated so why would the choice of using a concrete decking type floor/ceiling have to be rated?
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If it has a floor, it is a room, not a shaft. Grating is not a floor.
 

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we are talking fire protection being in place on all sides and a hole through a floor would be an opening in successive floors -- why would a grated surface not be a floor? I think we agree if the assembly is rated it should be addressed is as far as the NEC goes -- the interpretation of the assemblies(floor/ceiling ) fire rating or not is a building issue.
 
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