6.5.7 Overload Protection Devices

Hoists which have a rated capacity of 1 tonne or more or which are installed such that there is an overturning moment of 40,000 Nm or more, must be fitted with devices to warn the operative and prevent dangerous movements of the load in the event of overload or of the moments conducive to overturning being exceeded. Older equipment may not be fitted with such devices and we recommend that, if not, the application is assessed and if there is a risk of overload or overturning, that they fitted to the equipment.

Overload protection devices take different forms but may usually be set so that a load up to the proof load can be lifted or to allow a load in excess of the SWL, but less than the proof load to be raised. This protects the hoist from accidental overloading but allows for variations in the imposed load due to dynamic loading.