All the work described must be carried out by skilled and trained personnel. Skilled and trained personnel‘ are people whose education, experience and training (e.g. installation fitters certified by Lock) as well as knowledge of applicable standards and stipulations, work safety specifications and on-site conditions at the company authorize them to be responsible for the safety of the system, to carry out the activities required in each case and, in that process, to identify and to be able to prevent potential hazards.