S9407-AB-HBK-010 Datasheet, PDF (121/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
6.6 CABLE-TO-CABLE SPACING REQUIREMENTS
6.6.1 Cable-to-Cable Spacing Chart
The cable-to-cable spacing chart shown in figure 6-6 is a set of coordinates used to determine
the required spacing between the various cables. The coordinates consist of radiator and susceptor
designators previously defined in table 6-1. Spacing requirements shown on the chart are given in
inches and are measured between the closest points of the outer sheaths of the cables or between
the closest points of the outer surfaces of the shielding conduit enclosing the individual cables (see
figure 6-9).
6.6.2 Spacing of Multiconductor Cables
When multiconductor cables carry signals falling in more than one radiator category or more
than one susceptor category, the category with the greatest spacing requirement must be used to
determine the spacing.
6.6.3 Spacing of Dual-Function Cables
Spacing assigned to a dual-function cable (radiator and susceptor) must be determined by
both cable category designators assigned to the cable. The dual-function cable is considered to be
compatible within itself by reason of operating one function at a time (for example: transmit or
receive).
6.6.4 Spacing of Cables in Muted Systems
Radiators and susceptors may be run together if the systems connected to the susceptors are
muted (muted here refers to disabling the receiving system during the time that the radiators are
radiating).
6.6.5 Spacing of Single Conductor Cables
Cable designators are not assigned to single conductor cables in this section. Spacing
requirements for installations employing single conductor cables for supply and return circuits must be
considered on a special case basis and approved by NAVSEA (see paragraph 6.2.2) or other
NAVSEA-designated authority. The following are examples of single conductor cable types: TRF,
TRXF, SSGU, SHOF, SRW, and B16.
6.6.6 Spacing of Susceptible Cables with Large Effective Loop Areas
The voltage induced in a susceptible cable is directly proportional to the effective loop area of
that cable. Cable types containing effective loop areas large enough (greater than 0.65 square inch)
to generate impractical spacing requirements are not considered for susceptor application in this
section. When cables of this type are employed for susceptor application, the spacing requirements
must be determined on a special case basis and approved by NAVSEA (see paragraph 6.2.2) or other
NAVSEA-designated authority. Examples of such cable types are: 2SJ7 through 2SJ12, MCOS, and
MMOP.
6.6.7 Spacing of Portable Equipment Cables
These cables are not assigned a category because of the indeterminate spacing
requirements of portable cable.
6-8