Residential electrical installation - Protection against overvoltages and lightning
From Electrical Installation Guide
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The choice of surge arrester is described in chapter Protection against voltage surges in LV.
Installation rules
Three principal rules must be respected:
1 - It is imperative that the three lengths of cable used for the installation of the surge arrester each be less than 50 cm i.e.:
- the live conductors connected to the isolating switch
- from the isolating switch to the surge arrester
- from the surge arrester to the main distribution board (MDB) earth bar (not to be confused with the main protective-earth (PE) conductor or the main earth terminal for the installation.The MDB earth bar must evidently be located in the same cabinet as the surge arrester.
2 - It is necessary to use an isolating switch of a type recommended by the manufacturer of the surge arrester.
3 - In the interest of a good continuity of supply it is recommended that the circuit-breaker be of the time-delayed or selective type.
