Siemens S7-400 installation manual Diagram of the Lightning Protection Zones

Assembling and Installing Systems

Diagram of the Lightning Protection Zones

The following diagram illustrates a lightning protection zone concept for a detached building.

		Lightning Protection Zone 0, Field Side
External			Building
			Shield
Lightning		Lightning Protection Zone 1	(Steel
Protection			Reinforcement)
		Lightning Protection	Room Shield
			(Steel
Energy-		Zone 2
Technical			Reinforcement)
Cable		Lightning	Device Shield
		Protection	(Metal Housing)
		Zone 3
		Device	Non-
		Metal	Electrical
			Cable
		Component
			(Metal)
			Internal
			Cable
	Information-Technical Cable		Lightning Protection
			Equipotential	Bonding
			Local
			Equipotential	Bonding
			Galvanic
			Connection

Figure A-6 Lightning Protection Zones of a Building

Principle of Transitions between the Lightning Protection Zones

At the transition points between the lightning protection zones, you must take measures to prevent surges being conducted further.

The lightning protection zone concept also states that all lines at the transitions between the lightning protection zones that can carry lightning stroke current must be included in the lightning protection equipotential bonding.

Lines that can carry lightning stroke current include:

•Metal pipelines (for example, water, gas and heat)

•Power cables (for example, line voltage, 24 V supply)

•Data cables (for example, bus cable).

A-22	Automation System S7-400	Hardware and Installation
		A5E00850741-01