Perimeter protection system for a horizontal formwork system, and method of assembly of a perimeter protection system

A perimeter protection system for use in a horizontal formwork system, the perimeter protection system comprising:

• a perimeter protection structure that includes a first elongate profile forming a part of a railing of the perimeter protection structure, the first elongate profile having a guide that extends along a length of a first portion of the first elongate profile and a blocking groove that extends along a length of a second portion of the first elongate profile, the guide having spaced-apart first and second ends, the first end being located in a first end section of the first elongate profile, the blocking groove being located in a second end section of the first elongate profile located opposite the first end section, the blocking groove including an open end located at an end of the second end section and an at least partially closed end spaced-apart from the open end;
• a first auxiliary device attachable to a part of the horizontal formwork system, the first auxiliary device including a longitudinal body, a guide projection and a blocking projection, the blocking projection being spaced-apart from the guide projection, the guide projection being configured to be guided within the guide between the first and second ends, the blocking projection being configured to be guided within the blocking groove between the open end and closed end;
• wherein the perimeter protection structure is moveable between an initial assembly position, an intermediate position and a working position, in the initial assembly position the guide projection is located in the guide abutting the first end and the blocking projection resides outside the blocking groove, in the initial assembly position the perimeter protection structure is rotatable with respect to the first auxiliary device to assume the intermediate position, in the intermediate position the guide projection is located in the guide and the blocking projection resides outside the blocking groove, when in the working position the guide projection is located in the guide and the blocking projection is located in the blocking groove abutting the closed end, in the working position the perimeter protection device is not rotatable with respect to the first auxiliary device.