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6.2 Intermediate protection (M)
Intermediate protection reduces the residual energy of lightning effects or switching
actions. Sufficient decoupling from primary protection and fine protection is needed.
Application:
● At transitions between protective zone 0/E and protective zone 1
● On lines coming from the primary protection area
● On mains connections
Measures for fire detector lines:
With intermediate protection, the intended protective measures are limited to the
control panel and the voltage surge protection device must be positioned at the
control panel input. There must also be a voltage surge protection device at the
output for loops.
Application:
● On loops within a building which are more than 1000 meters in length
● On lines which are in roof sections or on exterior walls
● On lines which exit the building
● On lines within the building in church towers, towers, and castles
6.3 Fine protection (F)
Fine protection may limit smaller surge voltages and overcurrents and is usually
fitted in electronic devices.
Measures for fire detector lines
Fine protection is fitted on the periphery board and module bus cards.
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