S9407-AB-HBK-010 Datasheet, PDF (40/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
first length of conduit to the second length of conduit. This method of adding couplings
and conduit is continued until the entire cable run is shielded.
d. Because of the variables present in the installation of cable and conduit, as mentioned
above, there is no hard and fast rule for determining conduit size for a particular cable.
However, the goal should be to use the smallest conduit that will satisfy all the
necessary requirements for clearance between cable and conduit.
3.5 FLEXIBLE CONDUIT PREPARATION
The following instructions specify preinstallation procedures for flexible shielding conduit.
3.5.1 Cleaning Flexible Conduit
The flexible metal conduit is both air and liquid tight. Prior to shipment from the manufacturer,
the inner and outer surfaces of the flexible metal conduit are cleaned to remove oil and foreign matter,
the ends are capped, and the conduit is coiled and wrapped in rust inhibitor paper or sealed in a
plastic bag, which should not be removed until the conduit is needed for assembly.
If Type 1 or Type 2 conduit becomes contaminated by oil or foreign matter, it should be
recleaned by any process or combination of processes which will accomplish thorough cleaning
without damage to the metal or the rubber jacket. Also, any drying procedure shall not be injurious to
the metal or the rubber jacket.
3.5.2 Forming Flexible Conduit
Due to the tight braid construction of the conduit, it should be formed into the approximate
contour of its intended run before cutting. This will ensure the flexibility desired for the installation.
3.5.3 Cutting Flexible Conduit
a.
Prior to cutting Type 1 conduit, the braid in the area where the cut is to be made
should be silver-soldered or brazed to prevent flaring of the braid during and after the cut (see figure
3-3). Where brazing is not feasible, the area should be covered tightly with an appropriate tape during
cutting.
WARNING
Silver-brazing alloy contains cadmium, and poisonous fumes may be
formed on heating. Do not breathe fumes. Use only with an
adequate ventilation device, such as a fume collector, exhaust
ventilator, or air-supplied respirator.
CHANGE 1 of Revision 2
3-8