ZENER 8000-V Installation Manual
IM00165
23
Screened power cables and alternative materials
There is a wide variety of materials available as well as a degree of misunderstanding concerning the benefits of
material without explicit EMC related specification. The following table seeks to summarise the situation.
Category
Technical Data
Comment
1
Screened cable material
from reputable
manufacturers
Technical data will be
available to allow
assessment of the
performance of the
material against specific
criteria.
The manufacturer’s claimed
data can generally be relied
on, provided that the proper
installation and termination
practices are strictly adhered
to.
2
Generic materials with well
understood EMC properties
For example, screwed steel
conduit and MIMS cable
The technical
performance of these
materials is well
understood by analysis
from basic principles.
Specific data has been
reported in reputable
engineering research
journals.
These materials generally
offer very high performance,
provided that the proper
installation and termination
practices are strictly adhered
to.
3
Material without specific
EMC performance data.
Armoured cables and
flexible conduit systems fall
into this category when
there is no EMC
performance data
provided. Note that there
are high performance, fully
EMC specified examples of
these materials available
which would make them
part of category 1
None. Assessment of the
likely performance by
visual inspection is
difficult and unreliable.
These materials represent a
high risk category because the
EMC performance is simply
unknown.
Apparently similar materials
may have widely differing
EMC performance. In general,
there is no control of the EMC
properties during design or
manufacture because this is
not the intended application.
