Abstract: A method for fastening an attachment or suspension device to a porous support surface, preferably plasterboard, and also a device for carrying out the method. The device is secured to the support surface by means of fastener means, which preferably have a V-like configuration, the legs of which are driven through through-passing holes in the device attachment part. The holes have provided therein specially formed device parts which, when the fastener means is driven into the support surface, are operative in causing the legs of the fastener means to progressively diverge further within the support surface, such as to create force-absorbing crushed zones in abutment with the fastener legs.

Abstract: Jointing clamp (1) intended for electrical conductors and comprising an insulating, conical outer housing (2) having arranged therein a similarly conical inner sleeve (3). The narrow end of the outer sleeve (2) has located internally therein a seat (7) against which a metal ball (6) is locked by the inner sleeve (3) in a manner to fully close the narrow end of the inner sleeve. The outer sleeve (2) is extended with a tubular part (9) which surrounds a through-passing hole (10) in the seat (7) and thus forms a protective tubular device through which access can be had to the metal ball (6) with the aid of a test probe but which will prevent unintentional finger contacts with the ball. This enables electrical measurements to be made safely at joint locations without the need to remove the jointing clamps therefrom.