1-hour fire resistance rating for wire and cables

[Steve-R]

2009 IBC 3008.15.1 requires that wires or cables serving occupant evacuation elevators be protected by construction having a 1-hour fire resistance rating. How is this typically accomplished? It appears that fire-tape could provide this protection.

It appears that MI (mineral insulated) cable also provides this rating. What about standard wiring in conduit (THHN, etc)? I assume it has no fire resistance rating?

 

[gadfly56]

2009 IBC 3008.15.1 requires that wires or cables serving occupant evacuation elevators be protected by construction having a 1-hour fire resistance rating. How is this typically accomplished? It appears that fire-tape could provide this protection.

It appears that MI (mineral insulated) cable also provides this rating. What about standard wiring in conduit (THHN, etc)? I assume it has no fire resistance rating?

That would be correct. UL has basically left everyone in the lurch by pulling the listing for ALL the 2hr cable except MI. Peruse the installation sheet for MI, and you will want to run away right quick. UL's advice is to use another "approved method" which means either MI or putting 2" of brick or concrete around the wire.