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what is unsafe act?

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Protective system

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Protective systems are the methods of excavation will be decided with the situation and class of soil.  Required for excavations 4 feet or greater in depth.  Protective system refers to a method of protecting employees from cave ins from materiel that could fall or roll from an excavation face or in to an excavation and from the collapse of adjacent structures.  Protective system iuncludes support  systems, sloping ,benching,shielding systems and other systems that provide the necessary protection.
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Shoring

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Shoring is the provision of support system for trench faces used to prevent movement of soil.,under ground utilities,road ways and foundations.Shoring is used when the location or depth of the cut makes,slopping back to the maximum allowable slope-impractical. Shoring system consist of posts, wale  , straits and sheeting.  Three basic type of shoring's are :  Timber.  Hydrolic.  Pneumatic.
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