2 HR Rating

[Alwayslearningelec]

Are these the most common ways to give a circuit a 2 hour fire rating?


1. MI cable
2. Vitalink 2 hr MC cable
3. EMT with RHH 2 hour rated wire?

If the circuit is within a 2 hour rated room is it then considered 2 hour rated and you don't need any of the above? What about when it leaves the room? Would not make much sense to splice over and change to a 2 hour rated wiring method

 

[infinity]

I have installed all three. VitaLink seems to be what everyone is now using since EMT/RHH had a problem with it rotting out the tubing. You're missing #4, RMC in a 2 hour enclosure. I've done that too.

 

[gadfly56]

Are these the most common ways to give a circuit a 2 hour fire rating?


1. MI cable
2. Vitalink 2 hr MC cable
3. EMT with RHH 2 hour rated wire?

If the circuit is within a 2 hour rated room is it then considered 2 hour rated and you don't need any of the above? What about when it leaves the room? Would not make much sense to splice over and change to a 2 hour rated wiring method

Yes, and you don't need any of the fancy wiring methods. So, if your fire pump is located in a 2-hour rated room, as soon as the feed comes into the room you can flip to MC, EMT, IMT, or RMC.

 

[infinity]

So, if your fire pump is located in a 2-hour rated room, as soon as the feed comes into the room you can flip to MC, EMT, IMT, or RMC.

I believe that in NYC only RMC is permitted in the 2 hour rated room.