Fire pumps

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Jaywatanabe

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Location
Hawaii
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Electrician
When 2 hour fire rated meterial is required
What constitues 2 hour fire rated?
Is emt acceptable?
Where do find out this information?
 
"2-hour fire rated" typically refers to a specific wall assembly that has been shown to have that rating. Typically all an electrician would have to worry about is if you are penetrating the assembly. Any penetration has to be done by a rated/listed assembly product or method. In my limited experience this has been something that the electrician will pass off to the GC who then passes it off to the drywaller. Often missed and shows up in inspections.
 
The OP is referring to this, I think

695.6(2) Feeders. Fire pump supply conductors on the load side of
the final disconnecting means and overcurrent device(s)
permitted by 695.4(B), or conductors that connect directly to
an on-site standby generator, shall comply with all of the following:
(a) Independent Routing. The conductors shall be kept
entirely independent of all other wiring.
(b) Associated Fire Pump Loads. The conductors shall
supply only loads that are directly associated with the fire pump
system.
(c) Protection from Potential Damage. The conductors shall
be protected from potential damage by fire, structural failure,
or operational accident.
(d) Inside of a Building. Where routed through a building,
the conductors shall be protected from fire for 2 hours
using one of the following methods:
(1) The cable or raceway is encased in a minimum 50 mm
(2 in.) of concrete.
(2) The cable or raceway is a listed fire-resistive cable system.
Click to expand...
 
I think for most applications VITALink MC cable is probably the way to go these days. Much easier than MI cable which used to be about the only option. With any fire rated cable system you have to pay careful attention to all of the installation requirements as detailed in their listing. There will be requirements such as specified supporting, etc. Don't assume you can just throw it in like regular MC cable and be good to go.
 
I got underbid on a fire pump install on an existing building. I quoted running it on the outside wall in rigid from the transformer to the pump room, then inside. The competition quoted it from the MDP main section,(yes, same section as the main, not a pull section) through the open ceiling in EMT and flex to the fire pump room. No two hour firewall around the conduit. Guess who was a lot cheaper and got the job?
 
If you power source is in a different room than your fire pump
What would be legal way to run the conduit?
Would it need to be encased in a 2 hour fire rated drywall soffit?
Would it need to be rigid conduit?
 
Jaywatanabe said:
If you power source is in a different room than your fire pump
What would be legal way to run the conduit?
Would it need to be encased in a 2 hour fire rated drywall soffit?
Would it need to be rigid conduit?
Click to expand...
See Post 4.
 
hillbilly1 said:
I got underbid on a fire pump install on an existing building. I quoted running it on the outside wall in rigid from the transformer to the pump room, then inside. The competition quoted it from the MDP main section,(yes, same section as the main, not a pull section) through the open ceiling in EMT and flex to the fire pump room. No two hour firewall around the conduit. Guess who was a lot cheaper and got the job?
Click to expand...
😾 Did it pass inspection?
 
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