What is  ISO 4301-3 – Classification of cranes about ?
ISO 4301-3 provides the classification of tower cranes for construction work as defined in ISO 4306-3, and gives specific requirements for steel supporting structure, mechanisms, ropes, and further components based on standard service conditions, mainly expressed by the following:
- The number of working cycles
- The load spectrum factor
- The average displacements
- Additional values for factors to be used at the structural or mechanical calculation
Tower cranes for construction work are exclusively equipped with a hook as load-handling device. For tower cranes intended to be used for other purposes and/or equipped with other load handling devices, other values according to the specified usage of the tower crane may result
Who is ISO 4301-3 – Classification of cranes ?
ISO 4301-3 on the classification of cranes is applicable to: 
- Crane manufacturers
- Crane designers
- Crane operators
- End users
Why should you use ISO 4301-3 – Classification of cranes ?
It is essential to classify the crane type as a whole to specify the intended design life at first. The classification of the cranes' structural parts, mechanisms, ropes, or components is then derived from this basic assumption considering statistical effects with the usage of those.
ISO 4301-3 gives the minimum design requirement for the classification of tower cranes erected from parts, self-erecting towers, mobile self-erecting tower cranes, together with the recommended classification of its structural parts, mechanisms, ropes and components.
What’s changed since the last update ?
ISO 4301-3 replaces the first edition ISO 4301-3:1993, which has been technically revised.
The main changes compared to the previous edition are as follows:
- A new approach for the classification of tower cranes and their components has been introduced, based on ISO 4301-1:2016
- the classification has been limited to three different types of tower cranes for construction works, as defined in ISO 4306-3:2016
