S9407-AB-HBK-010 Datasheet, PDF (36/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
For multiple-point grounding, the unjacketed conduit (Type 1) greater than 10 feet in length
shall be bonded to ground potential at a point not greater than 5 feet from each end. Class "B"
bonding is acceptable; however, where it is not inherent in the installation of the conduit, the Type IV
bond straps are required.
3.4.6 Termination and Coupling of Type 2 Conduit
A Type 2 conduit installation must be insulated from the ground plane except at a single point
specified in the installation drawings. The following installation procedures are provided to ensure that
inadvertent grounding of the conduit does not occur.
a. Couplings: When two lengths of Type 2 conduit are to be coupled by means of an RP-
2200 or GR-2127 coupling, the rubber jacket must be cut back a sufficient amount to
allow for metal-to-metal contact. The resulting joint must then be enclosed in heat-
shrinkable tubing (per appendix D), or in a heat-shrinkable sleeve such as the "shrink-
around sleeve" made by Sigmaform Corp., or equivalent. Note: The tubing or sleeve
may also be used to cover damaged rubber jacket, providing the conduit itself is
undamaged.
b. End-fittings: As with couplings, the rubber jacket must be cut back to allow for metal-to-
metal contact between conduit and fitting. If insulation is required the assembly should
be covered with the heat-shrinkable tubing or sleeve mentioned above.
3.4.7 Selection of Flexible Conduit Size
The following paragraphs are presented as an aid in selecting the appropriate size flexible
conduit for shielding a particular cable.
3-4