ABB S800 I/O - Lightning Strike Protection

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I/O modules with Intrinsic Interfaces or standard process I/O modules and MTUs
together with isolators or barriers should be used when interfacing towards
equipment installed in hazardous locations.
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The I/O modules are not designed for direct connection to high voltage switch-gear.
Interposing relays are used for digital input and output signals as a connecting link.
For analog signals, special transmitters/converters are used.
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Industrial installations and power plants are normally provided with well-integrated
grounding networks installed together with the power distribution system.
In installations with such grounding systems, it is not necessary to install lightning
strike protection unless overhead wiring or suspended cables are used outdoors.
Large plants (water supply installations, refineries and so on) can however have an
inadequate grounding system and signal cables can be routed above ground. In such
cases lightning strike protection must be used.
Cables outside the grounding system (even for short distances such as 10 m) always
require lightning strike protection.
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When placing a control cabinet, specified minimum distances to walls and ceiling
must be kept to ensure satisfactory performance.