Chapter IV: Technical protection requirements during the works

In order to prevent spoil, materials, tools or objects of any kind from falling into trenches more than 1.30 metres deep, the trenches must be surrounded by plinths at least 15 centimetres high or have a shoring system with components at least 15 centimetres above ground level.

Spoil or material may only be deposited along a trench more than 1.30 metres deep if it is possible to create a berm at least 40 centimetres wide. This berm must be kept clear of any deposits at all times.

Measures, such as the digging of culverts and the installation of drains, are taken to limit infiltration from run-off water. In addition, measures such as the installation of pumps are planned to remedy the effects of any seepage that may occur.

After a period of rain or frost, the slope of the excavation or trench is examined. If necessary, the shoring is consolidated. The employer shall have this examination carried out by a competent person. The name and position of this person will be recorded in the safety register.

Trenches and excavations are equipped with the necessary means for rapid evacuation of workers.

When workers are required to cross a trench more than 40 centimetres wide, means of passage are put in place.

Shoring, struts and props may only be removed when effective protective measures have been taken against the risk of rockfall.

Undercutting may only be carried out using mechanically powered equipment and provided that it does not result in any danger to workers. When such work is carried out, measures must be taken to prevent access to the area in which the rockfall is likely to occur.

If a potentially explosive device is discovered, work in the vicinity is immediately halted until the competent authorities have removed the device.