On our -300 and NG aircraft the following applies:
Wing anti ice can be used on the ground, it is selected during the after start checks if required.
However when the aircraft rotates the wing anti ice automatically shuts off, this is so that in the unlikely event of an engine failure the WAI doesn't take any power away from the engine when it is critical. It can be reselected at a later stage.
Hope that clears it up.