Interlock guarding is generally achieved via mechanical or electrical means, but may also include hydraulic or pneumatic control systems. The energy stored in moving parts (momentum) can cause the mechanism of the machinery or equipment to run on for some time after the source of driving energy has been removed.
Where exposure to machinery and equipment hazards cannot be eliminated or substituted for machinery and equipment of improved design, risk controls must be applied to the hazards to prevent or reduce the risk (chance) of injury or harm.
Machines are used broadly in the field of mechanics. The word mechanical refers to the work that has been produced by machines or the machinery. It mostly relates to the machinery tools and the mechanical applications of science.
Where access is not anticipated, a fixed guard can be permanently applied by a bonding agent, welding, or secured with one-way screws. If access is generally not required, a permanently fixed barrier is the preferred option.