It is known that some polymer systems dispersed with conductive particles show switching phenomenon, the mechanism of which can be ascribed to volume expansion of the bulk polymer by Joule heat. We have reported that polyethylene glycol-graphite systems also show switching. However, the mechanism of the switching in these systems cannot be explained in terms of volume expansion, and thus a model for electric conduction in these systems has been presented. Unfortunately we later found that it was necessary to revise the model. In the present work electric properties of polyethylene glycol-graphite systems are reported with a reference of those of n-hexatriacontane-graphite systems. In the later systems switching can be explained in terms of volume expansion. From these results in these two systems a revised model is presented for electric conduction in polyethylene glycol-graphite systems.