First of all, wood working areas usually need a much tighter sprinkler patern than whatever was there before.....make sure the fitters do their thing first.
Secondly, the primary concern in testing Class 3 eqt is that it never get hot enough to ignite the dust....even when it's buried in it. In a wood shop, this would apply primarily to motors; all motors should be of the TEFC type. Some other things -lighting, for instance- can also get hot enough to be a concern.
Finally, there are likely to be alarm requirements, as well as control issues (automatic operation of dust collector, no auto re-start, etc) to address as well.
