Danfoss VLT Series Design Manual page 120

5. How to Install
Transfer impedance (Z
-
-
-
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a.
b.
c.
5
d.
e.
f.
g.
120
) can be assessed on the basis of the following factors:
T
The conductibility of the shield material.
The contact resistance between the individual shield conductors.
The shield coverage, i.e., the physical area of the cable covered by the shield - often
stated as a percentage value.
Shield type, i.e., braided or twisted pattern.
Aluminum-clad with copper wire.1
Twisted copper wire or armored
steel wire cable. 1
Single-layer braided copper wire
with varying percentage shield cov-
erage.
This is the typical Danfoss reference
cable.1
Double-layer braided copper wire.1
Twin layer of braided copper wire
with a magnetic, shielded/armored
intermediate layer.1
Cable that runs in copper tube or
steel tube.1
Lead cable with 0.43 in [1.1 mm]
wall thickness.1
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
VLT ® HVAC Drive Design Guide