Hardware Manual

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-

Saia-Burgess Controls AG

Cabling

Guidance

2

2.3 Cabling

2.3.1 Cable routing

● 230 V supply lines and signal lines must be laid in separate cables at least 10 cm

apart. Even within the switching cabinet, it is advisable to leave space between

power and signal lines.

● Digital signal / bus lines and analogue signal / sensor lines should be laid in

separate cables

● It is advisable to use shielded cables for analogue signal lines.

● The shield should be earthed at the entry or exit to the switching cabinet. The

shields should be as short as possible and of the largest possible cross-section.

The central earthing point should be > 10 mm² and connected to the PE ground

wire by the shortest route

● The shield is generally connected to one side of the switching cabinet only, unless

there is a potential equalization with significantly lower resistance than the shield

resistance

● Inductivities installed in the same switching cabinet, e.g. contactor coils, should be

provided with suitable suppressors (RC elements)

● Switching cabinet components with high field intensity, e.g. transformers or

frequency inverters, should be shielded with separator plates with a good ground

connection.

Surge protection for long distances or external lines

● Where lines are laid outside the building, or over longer distances, suitable surge

protection measures should be applied. For bus lines in particular, these measures

are essential.

● With lines laid outside, the shield must have adequate current-carrying capacity

and be earthed at both ends.

● The surge conductors should be installed at the input to the switching cabinet.