S9407-AB-HBK-010 Datasheet, PDF (182/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
7.7 REQUIREMENTS FOR THE USE OF ALUMINUM OR STEEL CONNECTORS AND
ACCESSORIES
To maintain the EMC protection obtained by a susceptible cable enclosed in a flexible
shielding conduit, certain spacing requirements should be met before the use of aluminum connectors
and its rear accessories (such as backshells) are considered. The requirements which allow the use
of aluminum or dictate the use of low-carbon steel connectors and accessories are as follows:
Where the section 6 spacing requirements for an unshielded susceptible cable operating at
frequencies below 100 kHz (i.e., section 6 cable categories S1, S2, S4, R5, R6, and R7) are met, an
aluminum connector and its accessories may be used. (See figure 7-12a.)
Where the section 6 spacing requirements for the unshielded susceptible cable operating at
frequencies below 100 kHz cannot be met, a low-carbon steel connector and its accessories should
be used. (See figure 7-12b.)
It should be noted that connectors and backshells made of low-carbon steel are not readily
available and may require a long delivery time. It should also be noted that some GR2000 series and
RP2000 series adapters can be attached directly to connectors in place of backshells. Thus, in many
cases, these adapters, which are made of low-carbon steel, can eliminate the need for a backshell
(whether aluminum or steel).
7.8 BONDING AND GROUNDING REQUIREMENTS
Electronic equipment, equipment enclosures, shielding enclosures, and associated conduit
shall be bonded to ground potential (ship's hull) as specified in MIL-STD-1310. See the paragraphs
under GENERAL REQUIREMENTS and DETAILED REQUIREMENTS dealing with EMI reduction.
For conduit grounding, see the paragraph on submarines.
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