Bob,
Refer the manager to Table 130.7(C)(15)(a) of 70E,
available @
http://www.depts.ttu.edu/opmanual/OP60.14B.pdfIt lists the Hazard/Risk Category Classifications.
Panelboards or Switchboards Rated >240 V and up to 600 V (with molded case or insulated case breakers)
CB or fused switch operation with covers on
Hazard Risk = 0
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600 V Class Switchgear (with power circuit breakers or fused switches)
CB or fused switch operation with covers on
Hazard Risk = 0