S9407-AB-HBK-010 Datasheet, PDF (190/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
As a third example, consider two cables in the TIF and WLL categories. To determine shielding
requirements:
a. Enter the chart at the left at line E (TIF). Move to the right to column 6(WLL).
b. Refer to chart legend to interpret the meaning of this block.
c. The arrow pointing toward the thin circle surrounding the WLL category designator indicates
the WLL category cable shall be shielded in flexible metal conduit if the minimum separation of 12 inches,
specified in the lower right-hand corner cannot be maintained.
d. Also, the 12 in the lower right-hand corner, according to the legend, indicates that if the 12-inch
separation in the cable run can be maintained, no shielding is required for either cable.
5-3-3 Exceptions to Requirements for SLL Cables
a. Installation of AN/BQS-6B, AN/BQS-13 sonar receiving cables below 100 kHz (SLL) and sonar
projector transmitting cables (SHL) in the same cableway is permitted without shielding or separation
provided:
(1) No other system sonar projector transmitting cables (SHL) are located within the
cableway throughout the entire run.
(2) The AN/BQS-6B and AN/BQS-13 cableways are located at least 6 inches from all other
passive electrical devices and 18 inches from all other sonar projector transmitting cables (SHL)
throughout the entire run between the elliptical bulkhead and the equipment cabinet in the EES space.
(3) Separation between preamplifier input cables and the transmitting cables located within
the sphere shall be at least 6 inches or installed in approved shielding.
b. Installation of sonar projector transmitting cables (SHL) in shielding (vice sonar receiving
cables below 100 kHz (SLL) is permitted in the reactor compartment.
c. A minimum separation distance of two inches shall be maintained between PASSIVE cables
and SLL shielded cables.
d. The following requirements apply to the separation of shielded or unshielded SLL category
cables where these cables enter equipment enclosures:
(1) Separation for cable point-of-entrance locations shall be as much as stuffing tube plate or
other dimensions, terminal board locations, and interior or exterior space limitations allow.
(2) Separation will not be required for point of entrance into equipment providing all of the
other active or passive cables which would violate the separation requirement are entering the same
equipment.
5-3-4 General Cable Separation Requirements
These general cable separation requirements apply to those cables not specifically covered in the
cable chart. Separation distance specified shall be measured between the outer sheaths of the cable or
between the external shields.
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