We have a small project where the city is requiring us to add a smoke exhaust fan inside a garage.
What does it mean to have wiring protected against interior fire exposure to temperatures in excess of 1,000F for a period of not less than 15 minutes? Does that mean I can just use a 1-hour rated conductor or can I just use a standard thwn wire inside rigid steel? I've never heard of this before.
What does it mean to have wiring protected against interior fire exposure to temperatures in excess of 1,000F for a period of not less than 15 minutes? Does that mean I can just use a 1-hour rated conductor or can I just use a standard thwn wire inside rigid steel? I've never heard of this before.