The construction site and the ground — temporary installations and underground cables

Construction site installations are always new temporary installations. They must follow the rules that apply when they are set up. In practice, DS/HD 60364-7-704:2018 is followed. Offices, canteens and dormitories on site follow the ordinary rules for installations.

• 01The owner or user of the installation is responsible.
• 02The authorised installer typically has responsibility up to and including the ACS socket-outlet boards.
• 03Installations supplied via a plug may be carried out by anyone who can do it safely. So a tradesperson may connect their own plug-supplied board to the ACS board.

The boards on a construction site must be ACS boards according to DS/EN 61439-4. ACS stands for «Assemblies for Construction Sites». Each board's outgoing circuit must have overcurrent and fault protection. The old Danish special rule on loop-through socket-outlets has not been continued.

• 01All circuits for socket-outlets and hand-held equipment up to and including 32 A must have a 30 mA RCD.
• 02Above 32 A, the RCD must match the earth resistance. If a 1 A RCD is used, the earth resistance may for example be at most 50 Ω.
• 03There is no requirement for selectivity between RCDs. If you want it, in practice it requires a ratio of at least 3:1.
• 04Without a risk assessment, surge protection (SPD) is required.