The isochrones showing the temperature dependence of the loss relaxation modulus of poly(neopentyl glycol methacrylate) present an ostensible subglass absorption called beta relaxation that roughly has the same intensity as the glass-rubber relaxation, or alpha process. The dielectric relaxation spectrum of this polymer also exhibits a well-developed beta process followed at higher temperatures by the glass-rubber, or a relaxation, which strong conductive effects only permit to be detected at high frequencies. A detailed study of the conductive contributions to the dielectric loss above T-g was carried out using a theory that assumes that the dispersion observed in tan delta in the frequency domain arises from the Maxwell-Wagner-Sillars effect combined with Nernst-Planck electrodynamic effects caused by interfacial polarizations in the interface polymer electrodes. Attempts were made to evaluate the equivalent salt concentration that would produce the conductive effects experimentally observed.