Safety supply at the construction site

The construction site, the space of repair affairs, the emergency area is strongly asked for urgent enclosure. It is impossible to perform installation or system of work, without fencing to the area, on which, in fact, they intend to live. Strangers who were unexpectedly appeared in an unsafe zone have every chance of falling into a pit or a hole, though simply, they have the opportunity to fall on their heads. In the evasion of only this, you need to observe the safety technique, one of