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Electrical Noise and Wiring Practices
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Design Considerations - index
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Analyzers


DOE-HDBK-1132-99
Crosstalk may occur when different AC signals are transmitted within the same
cable or adjoining cables. A workable solution to prevent crosstalk is to isolate
the paired circuits by shielding each pair and grounding the shields.
Lightning Protection for Instruments .
4.6
In general, most instruments are located in a structure or building. Lightning
protection for instrumentation begins with the lightning protection system of this
structure or building. To provide adequate lightning protection from a direct or
near lightning strike, a low impedance lightning protection system should be
considered. This low impedance lightning protection system provides a path of
lower resistance to earth ground, thereby providing protection for the instruments
and equipment within the protection/shielded zone.
The lightning protection system should be separate from the building grounding
system.
Another issue to consider when providing lightning protection for instruments is
to ensure the instruments and associated cables contained in the structure or
building would not be exposed to different ground potentials during a lightning
strike. This should be achieved by bonding all conduits, cable trays, and shields
of cables to a single ground reference point. This ground reference point should
be connected to the electrodes of the structure or building grounding system.
Where lightning strikes are more prevalent, other lightning dispersion or
elimination methods should be considered.
Surge protection should be considered for more sensitive instruments and
instrument cable runs between the buildings.
Fiber optic links should be used between sensors located in lightning prone
areas and the associated analyzers/transmitters.
II-47


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