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Are all steel doors fire resistant?
yes and no. anything made of cold rolled steel will resist fire.. the question is what kind of steel door and whether you are asking if it has an authorized fire label or not. residential steel - clad doors usually can get a 20minute UL fire rating, but it has to be labeled by the manufacturer ahead of time.. you need a commercial level hollow metal door to get a fire rating up to 3 hours. you can not have polyurethane core. it has to be foam or honeycomb.
When are 90 minute fire rated doors required?
90 minute doors are required when building code requires a 90 minute or 2 hour assembly rating. For example, with IBC '06, 715.4, if a 2 hour wall is required, you can have a 90 minute door. The fire resistance rating depends on the type of building occupancy and component. For example, for fire barrier assemblies or horizontal assemblies, for occupancy of type A (Assembly), B (Business), E, F-2, H-4, H-5, I, M (Merchantile), R, S-2, the fire rating is 2 hours. For other types, say U (Utility) the rating is 1 hour and for H-1 and H-2 (High Hazard) its 4 hours. Since the issue is complex, consult an architect to determine a specific application.
Can you drill a hole in a door and install a dead bolt lock if the door is fire rated?
The deadbolt should not affect your fire rating.
What is the major difference between noncombustible construction and fire resistive construction?
Basically non combustible and fire resistive are the same. Difference is non combustible has steel frame members that are unprotected or limited protected. Fire resistive has protected steel frame members with a fire rated material such as concrete.
Why rheostats have current rating in addition to resistance rating?
A resistor, of which a rheostat is, has a maximum amount of current it can handle. Beyond that value it will start heating up a lot and might burns up. Since, the maximum resistance of a rheostat is fixed so does its maximum safe current value that can flow through it.Comment'Rheostats' and 'potentiometers' describe applications of variable resistors; they are not alternative words for variable resistors.
