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Laying Field Cables

There are no special requirements for laying field and communication cables

connected to AC 800M. However:

• Cables for short-distance communication without modems should always be

routed at a distance of 10 cm (4 in) from other cables.

• All cables connected to AC 800M should be routed at a distance of 30cm

(12 in) from all power cables and 10 cm (4 in) from cables belonging to the

relevant international immunity standard, class 4.

Type of Field Cable

Always use shielded cables for the following applications:

• Communications

• High-frequency pulse transmission

• Low level analog signals, for example Pt100 and thermocouples

Unshielded cables may be used for other applications. The signal and return

conductor should be located in the same cable.

Industrial installations and power plants are normally provided with well-integrated

grounding networks, installed as part of the power distribution system. Such

installations do not require additional lightning protection unless using overhead

wiring or suspended cables in an outdoor environment.

However, large dispersed plants such as water supply installations and oil refineries

will have an inadequate grounding system where signal cables may be routed above

ground. In such cases lightning protection equipment must be installed.

Should cables be discovered outside the grounding system (even at a short distance

such as 10 m [9.1 yds]) lightning protection equipment must be installed