EMC Installation Guideline
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
247/528
2.4.7.3 EMC-compliant cable routing on the plant side on cable racks and in cable ducts
1)
When single-wire cables (e.g. unshielded supply connection cables) are used in three-phase systems, the three
phase conductors (L1, L2, and L3) must be bundled as symmetrically as possible to minimize the magnetic leakage
fields. This is particularly important when several single-wire cables need to be routed in parallel for each phase of a
three-phase system due to high amperages. The illustration below uses an example of a three-phase system with
three single-wire cables per phase routed in parallel (with and without PE conductor).
a) Three parallel single-wire cables per phase with PE conductor
b) Three parallel single-wire cables per phase without PE conductor
If the preferred two-layer bundle arrangement illustrated above is not feasible for mechanical reasons with special
applications– for example, where trailing cables are used – then the cables must be bundled in one layer in a single
plane as illustrated in the diagram below.
a) Three parallel single-wire cables per phase with PE conductor in a single plane
b) Three parallel single-wire cables per phase without PE conductor in a single plane
2)
and
3)
: See following page for explanations
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