S9407-AB-HBK-010 Datasheet, PDF (220/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
3.6.7 Splices. Two lengths of metal tubing shall be spliced (or joined) in accordance with 3.6.3.
Splices in braid wires shall be neatly made and shall cause no sharp or rough projection on the
conduit. Splices in the rubber jacket may be made either by a 3-inch (minimum) overlap, or by means
of a butt joint that is covered with a 6-inch (minimum) length of heat-shrinkable polychloroprene tubing
(see 3.5.6),
3.6.8 Ends. The ends of each length of conduit shall be cut square, with the ends of the braid wires
secured to the tubing by brazing. Each end of the conduit shall be free from sharp edges, burrs, or
excess brazing material which would interfere with the attachment of fittings.
3.7 Performance characteristics.
3.7.1 Watertightness. Conduit shall show no evidence of leakage or damage to the tubing when
tested as specified in 4.6.5. If any section of the conduit fails to pass the test of 4.6.5, that section
shall be rejected and any remaining conduit can be deemed acceptable only if it can be demonstrated
by test that all of it is in compliance with requirements.
3.7.2 Bend radius. When tested as specified in 4.6.6, Type 1 and Type 2 conduit shall withstand
bending in an arc of radius equal to that specified in Table I and shall show no evidence of internal
obstruction or damage, of any kind to the tubing as a result of the test. Type 2 conduit shall, in
addition, show minimum wrinkling of the rubber jacket on the inside of the bend when bent to the
prescribed radius. Any failure of the test sample to meet the bend radius requirement shall be cause
for rejection of the sample and of the production lot from which the samples were taken.
3.7.3 Shielding effectiveness. Shielding effectiveness throughout the frequency range of 30 Hz to
30 kHz shall be a minimum of 40dB for all conduit less than 2 inches in diameter and a minimum of 35
dB for 2-inch diameter conduit and larger when tested as specified in 4.6.7. Any failure of the test
sample to meet the shielding effectiveness requirement shall be cause for rejection of the sample and
of the production lot from which the samples were taken.
3.8 Interchangeability. All flexible metal conduit manufactured to this specification and having the
same part number shall be completely interchangeable with each other with respect to physical
(dimensional) and performance (functional) characteristics as specified herein.
3.9 Marking. The rubber jacket of Type 2 conduit shall be marked with an identifying legend
printed with white ink in block character type. The size of this lettering shall be not less than 1/8 inch
nor more than 1/4 inch. The legend shall consist of the wording "EMI SHIELDING CONDUIT," the
conduit part number (see 1.2.2), and the manufacturer's name. Example of legend:
EMI SHIELDING CONDUIT - EM06R - (manufacturer's name)
The legend shall be repeated at intervals not exceeding two feet. The print shall not be obliterated by
the action of petroleum base oil, fuels, hydraulic fluids, or water, and shall remain legible after
abrasion caused by normal handling of the conduit. (See 5.3 for identification tags.)
3.10 Manufacturer's technical data. Manufacturer's technical data shall be furnished with the
conduit supplied under this specification and shall include lot number, conduit part number,
dimensions with tolerances, weight per foot, materials, and marking information.
3.11 Workmanship. All details of manufacture shall be in accordance with best practice for flexible
metal conduit. The conduit shall be free from all defects which would adversely affect its
serviceability.
D-6