Plug for moisture-protected electrical plug connection

A plug for a moisture-protected electrical plug connection has a plug housing having an interior and contact elements secured in the plug housing. Electrical lines extend through the plug housing and are each conductively connected by an electrical connection to one of the contact elements. The electrical lines each have an enveloping insulation. A potting compound fills out the interior of the plug housing. The electrical lines each have a first area without insulation adjoining the electrical connection. An electrically non-conductive spacer is arranged between the first area and the electrical connection. The first area, on a side of the spacer facing away from the electrical connection, is embedded in the potting compound.