The four classes
| Class | Energy absorption | Maximum mesh | Typical use |
|---|---|---|---|
| A1 | 2.3 kJ | 60 mm | Lower energy, smaller opening required |
| A2 | 2.3 kJ | 100 mm | General construction with moderate fall energy |
| B1 | 4.4 kJ | 60 mm | Higher energy, smaller opening required |
| B2 | 4.4 kJ | 100 mm | Heavy sites, higher fall energy |
The letter: energy
EN 1263-1 tests nets by dropping a defined mass into them. Class A nets must absorb at least 2.3 kJ, class B nets at least 4.4 kJ. In practice the letter tells you how much reserve the net has. Choose class B where people may fall from greater heights within the permitted range, where the work involves heavy materials, or simply to keep a larger margin.
The number: mesh size
Class 1 nets have a mesh of at most 60 mm; class 2 nets at most 100 mm. A 100 mm mesh is lighter and more open and is the usual choice on building sites. A 60 mm mesh is used where a smaller opening is needed. Neither is designed to catch small objects such as bolts and tools: for those, lay a debris net over the safety net.
How to choose
- Start from the risk assessment: who can fall, from where, and how far.
- Keep the fall height low; it reduces the energy more than any choice of class.
- Choose B where the energy may be higher or a larger margin is wanted; otherwise A is sufficient.
- Choose mesh 2 (100 mm) unless a smaller opening is specifically required.
- Add a debris liner where small objects must be retained.
Our construction safety nets are available in class A2 and B2. The complete safety net guide explains how classes fit into the wider standard.
Frequently asked questions
Is B2 better than A2?
B2 absorbs more energy, so it suits higher fall energies. A2 is sufficient where the risk assessment shows lower energy. Both have a mesh of up to 100 mm.
When do I need a 60 mm mesh?
Where smaller openings are required, for example to reduce the chance of limbs passing through or where larger objects must be held back. For small objects, add a debris net.
Does the class change during use?
The class is guaranteed when new. Test meshes are tested periodically to confirm the net still meets the minimum for its class.