When lifting device can Wire rope hoist not exceed the maximum operating limit table position

the table fence height is less than 1.8m, no sharp edges should be suspended vertically in the lower edge of the bezel anti-collision wellhead floor with flexible member ( such as chain block ) , its sagging height of not less than 0.3m.
5.8.8 the limit position limit
When lifting device can not exceed the maximum operating limit table position, position limits should be set on limiting device to ensure the safety of space at the top table in line with the provisions of 5.5.2 .
5.8.9 anti-fall device
Lifting platform shall be provided to prevent falling or falling speed stage safety apparatus should be 1.6 times
the rated value of Wire rope hoist the table before the rate of decline in function , so that the table is stopped reliably .
In addition to the use of outer table scissor mechanism support or direct jacking cylinder lifting platform , anti-fall device should be connected directly with the table .
5.9 electrical systems and electrical protection
5.9.1 Power Supply System
AC power lifting platform should TN-S power supply system. When the power supply system as a result of the reasons can not be achieved , at least from the outlet end of the beginning of the main power switch , neutral and ground wires should always be separate.
5.9.2 Total Power Switch