Source : Webster's Revised Unabridged Dictionary (1913)

Nonconducting \Non`con*duct"ing\, a.
   Not conducting; not transmitting a fluid or force; thus, in
   electricity, wax is a nonconducting substance.

Source : WordNet®

nonconducting
     adj : not able to conduct heat or electricity or sound [syn: {nonconductive}]
           [ant: {conductive}]