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A protective covering, structure and layout should be designed properly, so that the body can not be directly into the danger zone.

In two, the protective cover should have enough strength, stiffness, should generally be made of metal material, the strength and stiffness of the conditions, can also be used in other materials manufacturing.

In three, the protective cover should be used in closed structure, when a scene requires the use of a mesh structure, the safety distance and the mesh opening width shall meet the following requirements:

1, in order to prevent the error by fingertip injuries caused by, the opening width: diameter and length or elliptical hole of the shorter axis should be less than 6.5mm, safety distance shall be not less than 35mm.

2, in order to prevent fingers error by causing injury, the opening width: diameter and length or elliptical hole of the shorter axis should be less than 12.5mm, safety distance shall be not less than 92mm.

3, to prevent the palm （ not including the first metacarpophalangeal joint ） error by causing injury, the opening width: diameter and length or elliptical hole of the shorter axis should be less than 20mm, safety distance shall be not less than 135mm.

4, in order to prevent the error through upper limb injuries caused by, the opening width: diameter and length or elliptical hole of the shorter axis should be less than 47mm, safety distance shall be not less than 460mm

5, in order to prevent the pointe error by causing injury, protective cover bottom and the ground （ or standing table） gap should be less than 76mm, safety distance shall be not less than 150mm.

In four, under normal circumstances, should adopt the fixed type protective cover, to be adjusted and the maintenance of the moving parts, priority should be given to the interlocking type protective cover, the conditions do not allow, can be open or adjustable protective cover.

In five, the protective cover surface must be smooth and free of burrs and sharp edges, should not become a new source of danger.

In six, the protective cover should not affect the sight and normal operation, should facilitate the equipment inspection and repair