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 MIL-HDBK-419A
CHAPTER 1
NEW FACILITIES DESIGN CRITERIA
1.1 INTRODUCTION.
This chapter presents the design, installation practices, test and acceptance procedures associated with the
incorporation of effective grounding, bonding, and shielding for a new facility.* The major elements of the
facility covered are the (1) earth electrode subsystem, (2) fault protection subsystem, (3) lightning protection
subsystem, (4) signal reference subsystem, (5) bonding, and (6) shielding. Design and construction steps for
these six elements are contained in the following sections:
1.2
Earth Electrode Subsystem
1.3
Lightning Protection for Structures
1.4
Fault Protection Subsystem
1.5
Signal Reference Subsystem for New Facilities
1.6
Grounding, Philosophy for Equipments Processing National Security Related Information
1.7
Bonding Practices
1.8
Shielding
1.9
Common-Mode Noise and Instrumentation
1.10
EMP Protection
1.11
Military Mobile Facilities
1.12
Fences
1.13
Inspection and Test Procedures for a New Facility
Secure transmission facility requirements are covered in Section 1.6. Supplemental measures which are needed
to be incorporated in a facility to help reduce common-mode and instrumentation noise problems are presented
in Section 1.9, Common-Mode Noise and Instrumentation. The special construction practices recommended to
reduce facility vulnerability to the electromagnetic pulse (EMP) threat are contained in Section 1.10, EMP
Protection.
Tactical grounding requirements are presented in Section 1.11, Military Mobile Facilities.
Inspection and Test Procedures for a New Facility, provided in Section 1.13, should be utilized in verifying that
recommended practices and procedures are properly implemented and to help establish a performance baseline
against which future measurements can be compared.
To obtain optimum performance of electronic equipment and personnel safety while providing adequate
protection against power system faults, EMP, and lightning strikes, thorough consideration must be given to the
grounding system for the building; to the bonds needed and the method of their implementation; and to the
shielding needed throughout the building for personnel safety and equipment interference control. For a new
facility, the requirements in each of these areas are defined and appropriate design steps set forth to assure
that the necessary measures are incorporated into the final structure and equipment installation.
*A new facility is considered to be one of new construction or an existing one that will undergo major
renovation or major equipment reconfiguration. The project engineer shall determine the grounding
requirements whenever minor equipment reconfigurations are accomplished in existing facilities. Refer to
Chapter 2 for additional information.
1-1
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