Specifications

33
Schneider Electric
Implementation guidelines (continued)
Whenever one of the three conditions is not completely met, the physical length of
the trunking should be associated with a coefficient to respect EMC. Such
coefficients reflect the decrease in the protection. The resulting permissible length
of the trunking will be less than the TLC.
Examples of other interference reduction systems
In cases where sheetmetal trunking cannot be used, other means can be used to
provide electrical continuity:
b Use of cable trays.
These cableways, made of welded heavy wire, are less effective and often more
costly than sheetmetal trunking.
b Use of a companion cable.
A companion cable can be used when no other solution is possible.
A raceway increases protection by a factor
of approximately 50 between 1 MHz and
100 MHz.
E52309E52310
Protection factor = 5
Protection factor = 10
Protection factor =
5
Com
p
anion cable
Cabling Guidelines