S9407-AB-HBK-010 Datasheet, PDF (175/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
7.5 METHOD FOR PLUGGING HOLE IN STEEL ENCLOSURE
Figure 7-6 illustrates a recommended method for plugging a hole in a steel enclosure when
welding is not practicable. The gasket provides an environmental seal for the enclosure, and the
retainer maintains the shielding integrity of the enclosure.
7.6 TERMINATIONS AT HULL FITTINGS
The following paragraphs describe the shielding hardware required to terminate flexible
conduit at the inboard end of pressure proof hull fittings.
7.6.1 90-Degree Capped Elbow Termination
Figure 7-7 shows the components required for a 90-degree capped elbow termination at a hull
fitting. The hull fittings is this figure are the type specified in MIL-C-24231 and are used to complete
the path of multiconductor cables through the submarine pressure hull. Most of these hull fittings are
supplied with 15-foot lengths of type B-16 wires (MIL-W-16878/1) attached to each hull fitting terminal.
The B-16 wires are fed through the cap portion of the elbow. The conductors of the shielded cable
are also run through the cap portion and connected to the B-16 wires. Once these conductors are
joined they are stuffed in the elbow and the cap is screwed in place. Table I in figure 7-7 lists typical
combinations of components required for the hull fittings used.
7.6.2 Two-Branch Assembly Termination
Figure 7-8 shows an assembly which can be used to shield and split the conductors
associated with hull fitting symbol No. 516 into two branches in opposite directions. Electromagnetic
shielding is maintained inside the assembly where the inboard conductors of the hull fitting are
connected to the conductors of the shielded cables.
7.6.3 Three-Branch Assembly Termination
Figure 7-9 shows an assembly which can be used to shield and split the conductors
associated with hull fitting symbol No. 516 into three branches. Electromagnetic shielding is
maintained inside the assembly where the inboard conductors of the hull fitting are connected to the
conductors of the shielded cables.
7.6.4 Tailpiece for Hull-Fitting Termination
Figure 7-10 shows a tailpiece used for terminating a 90-degree elbow, a two-branch
assembly, or a three-branch assembly to a hull-fitting gland nut.
7.6.5 MX-7637/U Stuffing Tube Termination Adapter
The MX-7637/U stuffing tube is a pressure proof fitting which has been designed to pass an
RG-293/U cable through the submarine pressure hull. The nut clamp of the MX-7637/U must be
replaced by an adapter, figure 7-11, which couples the stuffing tube to a 3/4-inch flexible metal
conduit. The end of the conduit which attaches to the adapter is terminated in a GR2129 ferrule and
coupling nut of figure 4-11 (section 4).
7-20