An arrangement for preventing vermin from advancing in a pipe (20), designed for fitting in a delimited part of the pipe, comprising a contact pole (13, 22) of electrically conductive material and an opposite pole (11, 21). The contact pole, which is partially movable in the longitudinal direction of the pipe, is arranged on the inner side of the pipe, and the opposite pole is arranged separate from said contact pole in order to earth the inner side of said pipe and is arranged in or on the inner side of said pipe. The arrangement, in an active state and when the contact pole is energized, which causes a difference in electrical potential between the opposite pole and the contact pole, administers an electric shock to a vermin which tries to pass the contact pole. The invention also relates to a pipe section comprising the arrangement.