Nonmetallic-Sheathed Cable - Exposed

[Lmeagles36]

334.10 (3)- permits NM (romex) cable to be installed in commercial buildings of Type III-V, but requires it be protected by a 15 minute thermal barrier (1/2 gyp board).
334.15 - permits NM (romex) cable to be exposed, as long as it is protected from damage and/or closely follows the building finish.
Don't these 2 sections contradict each other? What would the requirement be for a type V commercial building such a large storage structure?
Protect it with a minimum 15 minute rating, or run it exposed away from damage?

Thanks,

 

[augie47]

The way I read it, 334.15 only prescribes how the Romex is to be installed when it is allowed to be run exposed.

 

[MasterTheNEC]

:thumbsup:

The way I read it, 334.15 only prescribes how the Romex is to be installed when it is allowed to be run exposed.

 

[Lmeagles36]

So just to avoid any confusion, you are saying it is not allowed to be run exposed in any commercial Type III, IV, or V building other than One and Two Family Dwellings and Multi-family Dwellings?

 

[Dennis Alwon]

So just to avoid any confusion, you are saying it is not allowed to be run exposed in any commercial Type III, IV, or V building other than One and Two Family Dwellings and Multi-family Dwellings?

It can't be run exposed in most building types because it must be protected by a thermal barrier.

Other structures permitted to be of Types III, IV, and V
construction. Cables shall be concealed within walls,
floors, or ceilings that provide a thermal barrier of material
that has at least a 15-minute finish rating as identified
in listings of fire-rated assemblies.