I had to put in isolators and hold-downs on an optional stand-by once. But unfortunately I really could not tell you 'why' they required them as to any certain code. (Outside of the NEC things start to blur...) But from what little I understood, it was required by the building dept. due to the mounted equipments weight/height and proximity to the building? I believe the thinking was that it could fall or shift and take out a wall? It was a 500 kw next to an historical building. And the isolators were only there to protect the hold-downs as a pull-out stress and shear reduction.
This was back during my 'do as you're told' days.... Wish I could say more.
And I doubt this has any code relevance, but would aid in the general thinking....
http://www.seismic.ca.gov/pub/CSSC_2006-02_COG.pdf And: (
some code referances in these?) http://atcouncil.org/pdfs/bp6b.pdf http://atcouncil.org/pdfs/bp6a.pdf [This message has been edited by e57 (edited 12-09-2006).]
