Page 84 - IS-Rayfast Catalogue - Issue 9, 2017

Wire and Cable
Custom Cable Designs
3. Electromagnetic Screen Selection
Multi-conductor cables

1 The screening of cables is important, whether
to minimise cross-talk within the cable, the
prevention of interference from external
2 sources, or the elimination of radiation from the
cable itself.
Effective design of cables to provide
3
shielding over a broad frequency spectrum
is complex and must be tailored to specific
4 electromagnetic environments. From simple
aluminised Polyester, to more complex and
comprehensive shielding incorporating plated
5 copper braids and Mu metal wraps.
Conventional braiding methods can be
improved by computer optimisation, which can
6 give many times the shielding performance of
3. Screening Options
a basic shield with minimal weight penalty or
increase in optical coverage. Super screened
7 Aluminised Polyester
cable combines Mu metal wraps with optimised
braids to provide even further enhanced
8 performance, especially at low frequencies.
Aluminised Mylar
9 Offers first level of protection for standard Single Braid
Electrostatic screening applications.
10 Single Braid
Increased screening level offering low level EMI
11 and low sensitivity environments. Single Optimised Braid
Single Optimised Braid
12 Further improved braid screen for sensitive
lines and high EMI work.
Double Optimised Braid
13
Double Optimised Braid
Two layers of braid screen offering protection
14 for highly sensitive lines and severe EMI.
Double Optimised Braids + Mu Metal Wrap Double Optimised Braids with Mu metal wrap
15 As above but with interlayer of screening,
known as Super screened, this cable is suitable
for very high protection levels EMP/Tempest.
16
Triple Optimised Braids + Mu Metal Wrap x2
Triple Optimised Braids with double Mu metal wrap
17 The double and triple Super screened
cable is recommended for the severest of
environmental applications.
18

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