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5 Protective zones
The protective zones are areas nested inside one another. Surge voltages are
reduced at the transition between protective zones.
Appropriate reduction measures:
● External lightning measures
● Room shielding and building shielding using steel reinforcement
● Device shielding using metal housings
● Use of suitable components on the connections
Protection is provided from the outside working in using protective zones.
● Protective zone 0, outside (also protective zones 0/A, 0/B, 0/C, or 0/E)
● Protective zone 1 within protective zone 0
● Protective zone 2 within protective zone 1
● Protective zone n within protective zones n-1
Position of protective zones and components:
● Protective zone 0 is in the building shell area.
● The fire detection installation is in protective zone 2.
● The fire detection installation components may be in protective zone 2…n.
● The same protective zones may be linked if the connection also corresponds to
the requirements of this protective zone.
Figure 1: Diagram for protective zones around and in buildings
BMA Fire detection installation Zone 1 Protective zone 1
G Building Zone 2 Protective zone 2
Zone 0 Protective zone 0
Lightning protection
Measures counteracting the effects of lightning are considered lightning protection.
● External lightning protection relates to components outside the building.
● Internal lightning protection relates to components inside the building.
Zone 2
Zone 0
Zone 1
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