Does an electrical room have to be fire rated?

[lile001]

Re: Does an electrical room have to be fire rated?

Not a great design, I grant you, but it does comply with 110.26(C)(2)!

Not a great design indeed! Another example of "the letter of the law" being not the best design. I certainly would not want to design one that way, however I have designs where the second exit from the electrical room goes through some closet or such. But I have always made sure the poor sucker in the electrical room can get out both ways, because that poor sucker might be ME!

So if an electrcal room has no transformers, it does not absolutely need a fire rating? Anybody disagree?

 

[lile001]

Re: Does an electrical room have to be fire rated?

Originally posted by ryan_618:
If you have a transformer larger than 11.25kVA, be sure to see 450.21(B). Other than that, there is no requirement, other than requirements that the architect should not about, such as accessory uses or incidental use areas.

NEC 450.21 (A) has an exception for transformers that are class 155 insulation or better, and are "completely enclosed except for ventilation openings". I am dealing with a standard Square D Dry type transformer, class 220. These are always completely enclosed, no? This would lead me to believe that the fire rating is not absolutely required. Anyone agree?