Fire Rating of conduit and junction boxes

[STE Eng]

What is the fire rating of EMT conduit and junction boxes (NEMA-4)?
In case of fire in the area thru which conduit passes through, how much time does the conduit hold before damaging the wire inside?
Mechanical example: sheet metal ducts are rated for 1 hour i.e., fire will not pass thru the ducts for one hour.

 

[tkb]

It’s not the conduit or boxes, it’s the wire that bakes inside that is the week link.

 

[STE Eng]

An emergency generator feeding a transfer switch and EM panel, does this conduit need special protection? what if the space it passes thru is on fire?

 

[tkb]

Then MI cable is required

 

[petersonra]

It’s not the conduit or boxes, it’s the wire that bakes inside that is the week link.

The conductor insulation is the weakest link.

 

[petersonra]

Then MI cable is required

I think there are other options, like encasing conduit in concrete, but MI might be the simplest solution.