Charlie:

Is that some local code? The reason that I ask is that there aren't any requirements like that here at all. It's strictly building architecture that mandates code enforcement here.

Of course, I can't imagine a wood-frame structure designed to house more than 100 people. We have plenty of new one-story office buildings that may have more than 100 occupants, but as long as regular firewalls and partitioning are performed, non-plenum cable is perfectly legal.

Around here, it's all a matter of air return (plenum) ceilings that mandate plenum cabling, but again, most construction here is new or current.

Ed Vaughn, MBSWWYPBX