Siemens SIROTEC Planning Manual page 36

Wiring and Shielding
Requirements for the line length
·
Avoid unnecessary line lengths. Thus coupling capacities and coupling
inductivities are kept small.
·
Spare lines should be as short as possible.
·
Cores of spare lines should at least be put at one line end on a potential, and
should preferably be earthed.
Additional requirements
·
Basically the ready-made original lines recommended by the manufacturer
should be used. Thereby the maximum line length must be adhered to for the
respective purpose. Indications of the line length can be found in the product
catalogue or in the product-specific documentation. These line lengths refer to
the original lines of the manufacturer.
·
The lines and plugs must be protected against mechanical damage, e.g. by
cable ducts or coverings.
·
The penetration of oil, refrigerant or chips into plug-in connections must be
prevented.
·
The plugs must be attached firmly to the components.
·
Use special lines for cable installations which are suitable for this purpose.
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EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
© Siemens AG, 2004. All rights reserved