ECN Forum Forums Code Related Discussion NEC & other Code issues Floor box w/ PVC or Galv?

In NYC, currently with NEC 2005, can we use PVC floor box on a commercial office bldg? PVC link - (http://www.lewelectric.com/cfm/pvc.cfm) Or must be use Cast iron (water-tight) commercial grade? Commercial grade link -(http://www.lewelectric.com/cfm/commercial.cfm) Please help. Thank you.