S9407-AB-HBK-010 Datasheet, PDF (11/276 Pages) Glenair, Inc. – HANDBOOK OF SHIPBOARD ELECTROMAGNETIC SHIELDING PRACTICES

S9407-AB-HBK-010, Rev. 2
Section 1
GENERAL DESCRIPTION
1.1 INTRODUCTION
The purpose of this handbook is to specify requirements and to provide technical guidance in
the design and installation of electrical cables, cableways and shielding associated with electrical and
electronic systems installed aboard submarines, in below-decks areas of surface ships, and in many
shore-based installations. Proper use of this technical guidance will ensure electromagnetic
compatibility (EMC) of these systems.
This handbook is intended for use by ship designers, work planners and personnel engaged
in the installation of electrical and electronic cables and equipment for new ship construction,
SHIPALT installation and repair at shipyards, tenders and other activities.
1.1.1 Scope
This handbook provides information on cable spacing and shielding requirements for cables
described in certain military specifications, information on flexible and rigid shielding conduit, conduit
fittings and enclosures, and other pertinent information.
If it is determined, on an individual basis, that specific areas need not adhere to the guidance
of this handbook, it is recommended that the wording in the controlling document (ship specification,
ship alteration, etc.) indicate exceptions to these requirements. The spacing/shielding criteria
presented here has a sound technical basis amenable to special case situations to suit a particular
application. Special case areas of applicability should be accomplished as part of the specifications
for the task and incorporated in the design. NUWC, Newport, as authorized by NAVSEA, can provide
guidance in the special case process.
1.2 OBJECTIVE
The objective of this handbook is to ensure that electrical and electronic equipment will
operate compatibly in the shipboard electromagnetic environment. Electromagnetic compatibility
(EMC), is defined as "The condition which prevails when telecommunications (communication-
electronic) equipment is collectively performing its individual designed functions in a common
electromagnetic environment without causing or suffering unacceptable degradation due to
electromagnetic interference to or from other equipment/systems in the same environment." EMC
must, of necessity, be a major consideration during ship design and equipment installation because
without EMC the warfare capability of Navy ships will be seriously reduced. The potential for
electromagnetic interference (EMI) problems has increased through the years for the following
reasons:
a. The increased complexity and sophistication of communications, sonar, and other
electronic equipment,
b. The increased sensitivity of, and therefore, greater susceptibility to interference to
detectors and receiving circuits,
c. The high power levels generated and radiated by many system components, and
d. The very high density of electronic equipment in the relatively small confined spaces in
Navy ships.
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