earshavewalls
Bronze Member
I have a permit applicant who is proposing installing a 75kVA dry-type transformer (480/208y, 3-phase) above a suspended ceiling.
Article 450.13(B) states that transformers over 50kVA are not permitted in "hollow spaces of buildings not permanently closed in by structure". Does the space above a suspended (acoustic) ceiling fit the definition of "hollow space"?
I have been working with the code since the 70's and never came across this until now (maybe I need to try to read ALL of the Code someday)........I know it's not a new section. Times like this help me to realize how much I still DON'T know.........lol.
Any input is welcome. I don't run into this very often and I wish to be accurate in enforcing the code, but I don't want to put people through the hoops unless it is truly necessary.
Article 450.13(B) states that transformers over 50kVA are not permitted in "hollow spaces of buildings not permanently closed in by structure". Does the space above a suspended (acoustic) ceiling fit the definition of "hollow space"?
I have been working with the code since the 70's and never came across this until now (maybe I need to try to read ALL of the Code someday)........I know it's not a new section. Times like this help me to realize how much I still DON'T know.........lol.
Any input is welcome. I don't run into this very often and I wish to be accurate in enforcing the code, but I don't want to put people through the hoops unless it is truly necessary.