Appendix F Environmental Data Installation Requirements
3BSE 027 941 R301 221
Installation Requirements
Installation regulations for all products are included in relevant product
documentation. Some general installation rules and applications are given below.
Laying Field Cables
There are no special requirements for laying field and communication cables
connected to products. However:
Cables for short-distance communication without modems should always be routed
at a distance of 10cm (4in.) from other cables.
All product-connected cables should be routed at a distance of 30cm (12in.) from
non-product power cables (heavy current cables) and 10cm (4in.) from class 4
cables of relevant international immunity standards.
Types of Field Cable
Shielded cables are always necessary for:
• Communications (see product documentation for cable type)
• High-frequency pulse transmission (see product documentation for cable type)
• Low-level analog signals, e.g. Pt100 and thermocouples
• Analog application with a system accuracy >
12 bits
For other applications unshielded cables may be used. Digital and analog signals of
the same type can be run on the same cable.
Signal and return conductors must always be located on the same cable.
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