(1) for a ladder at a height exceeding 7.5 m. To install the stairs every 5 m terrace However, for a ladder that was used just once per year by a given employee can only perform the installation of all suburbs, 7.5 metre ladder.
(1) For a ladder with a height exceeding 7.5 meters must be installed every 5 meters, landing on the stairs, however, is used only once per year. Employees can only install the required landing every 7.5 meters.
(1) for stairs with height of more than 7.5 meters to install balcony stairs every 5 meters. However, for a ladder was used just once a year. By the staff decided the only can install balcony stairs every 7.5 meters.