Abstract: A direct current supply voltage for controlling an electronic switch, for example a triac, is obtained from a residual voltage at the terminals of the switch when it is conducting. The electrical energy needed to produce an auxiliary power supply voltage is taken from the terminals of the electronic switch while it is conducting. The residual voltage is rectified and stepped up, for example using a regulated switch-mode power supply circuit as a rectifier/voltage step-up system.

Abstract: A device for connecting at least two lengths of trunking includes a plate for joining backs of base sections of the trunking. The plate has on each of its edges adjacent cut edges of the trunking base sections longitudinal tongues which bear on two opposite faces of each back. The tongues are substantially plane, have a thickness from about 0.2 mm to about 1 mm, and bear elastically against the opposite faces of the back.

Abstract: A branch connection accessory for establishing a connection between first trunking which is fixed to a vertical support and second trunking which rests on a horizontal support includes a closure plate for closing the first trunking provided at its base with a communication opening to establish communication between the respective interior spaces of the first trunking and the second trunking. The communication opening is delimited laterally by legs each having at least one removable portion so that the height of the communication opening can be adapted to the relative position of the first trunking and the second trunking. A connection accessory is attached to the closure plate to close the communication opening from the outside and includes a canopy adapted to cover locally a closure cover section of the second trunking.

Abstract: A branch connection box for trunking includes a base and a cover. The base includes a central housing delimited by partitions that can be cut and form an electrical connection box and, around the central housing, an open path for routing electrical conductors or cables.

Abstract: An accessory for attaching to a base section of trunking for routing electrical cables or conductors includes a joint inside the trunking for masking any longitudinal gap beyond an edge of a length of cover section. The joint includes an elastically deformable wall which deforms elastically between a first configuration in which at least a portion of the wall is at the same level as the cover section and a second configuration in which the wall is at a lower level than the cover section.