S9407-AB-HBK-010 Datasheet, PDF (188/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
5-3-2 Cable Shielding and Separation Chart
The chart in figure 5-1 specifies the requirement for shielding and separation of cables used for
submarine electronic systems installations. The chart legend defines the various symbols used.
To use the chart, determine the category of the cables for which shielding or separation information
is required. As an example, it has been determined that two cables being installed in a cable run fall in the
LL and XLL category. To determine shielding requirements:
a. Enter the chart on the left at line F(LL), move to the right to column 4(XLL). The block at the
intersection of line F, column 4 is
b. Refer to the chart legend to interpret the meaning of this block.
c. The heavy circle surrounding the designator XLL specifies that the cable in the XLL category
must be shielded in high permeability flexible metal conduit. Since there are no lines or arrowheads
between the two cable category designators, the chart legend indicates that the two cables are compatible
and no addition shielding or separation is required.
As another example, consider two cables in the VHL and XLL category. To determine shielding
requirements:
a. Enter the chart on the left at line B(VHL), move to right to column 4(XLL).
b. Refer to the chart legend to interpret the meaning of this block.
c. The line between the two designators in the block indicates that the cables are not compatible
and both require shielding and separation.
d. The heavy circles surrounding each of the designators specify that both cables must be shielded
in high permeability flexible metal conduit.
e. The number 12 enclosed in a square indicates that besides the use of flexible conduit the two
cable runs enclosed in metal conduit must have a minimum separation of 12 inches.
A-3