Design rules of the electrical installation protection system
From Electrical Installation Guide
To protect an electrical installation in a building, simple rules apply for the choice of
|
For a power distribution system, the main characteristics used to define the lightning protection system and select a SPD to protect an electrical installation in a building are:
- SPD
- quantity of SPD;
- type;
- level of exposure to define the SPD's maximum discharge current Imax.
- Short circuit protection device
- maximum discharge current Imax;
- short-circuit current Isc at the point of installation.
The logic diagram in the Figure J20 below illustrates this design rule.
Fig. J20: Logic diagram for selection of a protection system
The other characteristics for selection of a SPD are predefined for an electrical installation.
- number of poles in SPD;
- voltage protection level Up;
- operating voltage Uc.
This sub-section J3 describes in greater detail the criteria for selection of the protection system according to the characteristics of the installation, the equipment to be protected and the environment.
