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MIL-STD-188_124A.024881.pdf
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MIL-STD-188-124A
2 FEBRUARY 1984
suP~
,
MIL-STD-188-124
14 JUNE 1978
MILITARY STANDARD
GROUNDING, BONDING AND SHIELDING
for Common
Long Haul/Tactical Communication Systems
Including Ground Based Conununications-
Electronics Facilities and Equipments
NO D13TlVlIFW3LE DATA F@UIRHJ B1’THISDXUMEWC
EMCS/SLHC/TCTS
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MIL-STD- 188-! 24A
2 FEBRUARY 1984
●
DEPARTMENT OF DEFENSE
Washington, D.C. 20301
GROUNDING, BONDING AND SHIELDING
MIL-STD-188-124
1.
This Military Standard is approvedand mandatory for use by all Departments and Agencies of the Department
ofDefensei“acc.mdmce withOASD (C31) Memo (see Appendix A).
2.
Beneficial comments (recoin rne”dat ions, additions, deletions) .md my patine”t data which may be of
USe i“
improving this document should be addressed tcx Commander; 184’2 EEGIEEITE, Scott AFB IL 62225, by u.sing the
self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this
document or by letter.
I
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MIL-STD- 188- 124A
2 FE8RUA8Y 1984
@
FOREWORD
1.
Standards for all military communications are published as part of e MIL-STD-188 series of documents:
Military Communications System Technical Standards are subdivided into Common Long HaullTactical Standards
(MIL-STD-188-100 series),
Tactical Standards (M1L-STD-188-200 series) and Long Haul Standards
(MIL-8TD-188-300 series).
2. This document contains technical standards and design objectives to ensure the optimum performance of
ground-based telecommunications C-E equipment installations.
This is accomplished by reducing noise and by
providing adequate protection against power system faults and lightning strikes. Thorough consideration must be
given to the bounding of equipment and facility installation-s, the trending required, and the methods of shielding
and implementation needed for personnel safety end equipment control.
3.
This standard is also recoin mended for applicable use on any ground facility or equipment where grounding,
bonding, shielding, personnel safety, lightning and EMC are required.
Examples of such facilities are aircraft
simulators, computer centers, Iaiwratory buildings, weapons checkout and assembly, etc.
4. Paragraph 5.1, Grounding, for this standard is divided as follow%
L Detailed requirements for facilities, including buildings and associated structures used principally for
c-E equipment.
11. Detailed requirements for” C-E equipment which address grounding, bonding, and shielding for
tacticalflong haul fixed ground transportable and military communications electronics equipment
installations and associated subsystems.
5.
Detailed requirements for Bonding and Shielding are contained in 5.2 and 5.3.
6.
This standard is further implemented by MIL-HDBK-419; Grounding, Bonding, and Shielding for Electronic
Facilities and Equipments.
e
11
7.
Asterisks or vertical lines are not used in this revision to identify changes with respect to tbe previous issue
due to the extensiveness of the changes.
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MIL-STD-188–124A
2 FEBRUARY 1986
CONTENTS
Paragraph 1.
1.1
1.2
1.3
1.4
1.5
2.
2.1
2.1.1
2.1.2
2.2
2.3
2.4
3.
~
SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Content. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Objectives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SystemStandardsandDesig”Objectives . . . . . . . . . . . . . . . . . . . . 1
REFERENCED DOCUMENTS. . . . . . . . . . . . . . . . . . .“. . . . . . . 2
Government Documents . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Specifications, Standards, and Handbooks. ; . . . . . . . . . . . . . . . . . 2
Other Government Documents, Drawings, and Publications . . . . . . . . . . . .
2
OtherPublicatiom . . . . . . . . . . . . . . . . . . . . . . . 3
SourceofDocume”ts . . . . . . . . . . . . . . . . . . . . . . . . 3
OrderofPrecedence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DEF[NITIONS . , . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.
GENERALREQU[REMENTS. , . . . . . . . . . . . . . . . . . . . . . .
4.1
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2
Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2
TacticalEquipmentsandF&cilities . . . . . . . . . . . . . . . . . . . . . .
4.3
Bonding. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4
Shielding. . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1
General. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
DETAILEDREQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . .
5.1
Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1
BuildingandStructure. . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.1
EarthElectrodeS”bsystem . . . . . . . . . . . . . . . . . . . .
5.1.1.1.1
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.1.2
EarthResistivitySurvey.. . . . . . . . . . . . . . . . . . . . . . .
5.1.1.1.3
Mi”imumConfiguratio” . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .1.3.1
ResistancetoEarth. . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .1.3.2
Additional Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.1.4 Ground Rods. . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.1.5 Connecting Risers. . . . . . . . . . . . . . . . . . . .
5.1.1 .1.6 OtherU.dergm.”dMetals . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.1.7
Resista”ceCbecks . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.2
FaultProtectionSubsystem . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.2.1 General. . . . .’. . . . . . . . . . . . . . . . . . . . . ., . . . . .
5.1.1.2.2
B.ildingStrueturalSteel. . . . . . . . . . . . . . . . . . . .
5.1.1.2.3
PipeSandTubes. . . . . . . . . . . . . . . . . . . . . . .
5.1.1.2.4
ElectricalS.pporti”gStructures . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.4.1
Conduit. . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.4.2 CableTraysorRaceways . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.4.3
Wiri”gSystemEnclosures . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.4.4 MetallicPowerCableSheatbs . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.2.5
ElectricalPowerSystems . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.1 ACDistributio”Systems. . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1.2.5.1.1 Single Buildi”gwith MultipowerSources . . . . . . . . . . . . . . . . . . . .
5.1.1.2.5.1.2 Multibuildi”gswithSinglePowerSource . . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.2 StandbyACGenerators . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.3 ACOutlets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.4 ElectricalMotorsandGe”erators . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.5 DCPowerSources . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.6
?detaRicBattepyRacks . . . . . . . . . . . . . . . . . . . . . .
5.1.1 .2.5.7 Ground Fault Circuit Intermmters . . . . . . . . . . . . . . . . . . . . .
5.1.1.2.6
SecureFacilities. . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5
5
5
5
5
5
s
5
6
6
6
6
6
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6
6
6
6
6
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MIL-S’CD- 188- i24A
2 FEBRUARY 1984
CONTENTS - Continued
5.1.1.3
5,1.1.3.1
5.1.1.3.2
5.1.1.3.3
5.1.1.3.4
5.1.1.3.5
5.1.1.3.6
5.1.1.3.7
5.1.1.3.8
5.1.1 .3.8.1
5.1.1 .3.8.2
5.1.1 .3.8.3
5.1.1 .3.8.4
5.1.1 .3.9
5.1.1.3.10
5.1.1 .3.10.1
5.1.1 .3.10.2
5.1.1,3.11
5.1.1.3.12
5.1.1.3.13
5.1.1.4
5.1,1 .4.1
5.1.1.4.2
5.1.1.4.3
5.1.2
5.1.2.1
5.1.2.1.1
5:1.2 .1.1.1
5.1.2 .1.1.2
5.1.2 .1.1.3
5.1.2 .1.1.4
5.1.2.2
5.1.2.2.1
5.1.2.2.2
5.1.2.2.3
5.1.2.2.4
5.1.2.2.5
5.1.2.2.6
5.2
5.2.1
5.2.2
5.2.3
5.2.3.1
5.2.3.2
5.2.3.3
5.2.3.3.1
5.2.4
5.2.5
5.2.5.1
5.2.5.2
5.2.5.3
5.2.5.4
5.2.6
5.2.6.1
5.2.6.3
5.2.6.3
5.2.6.4
5.2.6.4.1
5.2.6.4.2
5.2.6.5
5.2.6.6
Lightning Protection Subsystem. . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buildi”gsandStructures. . . . . . . . . . . . . . . . . . . . . . . .
Down Conductors. . . . . . . . . . . . . . . . . . . . . . .
Bonding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Str”eturalSteel. . . . . . . . . . . . . . . . . . . . . . . . . . . .
AirTerminals(LightningRods) . . . . . . . . . . . . . . . . . . . .
Guards . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SupportingStructures(Towers) . . . . . . . . . . . . . . . . . . . .
EarthElectrodeSubsystem. . . . . . . . . . . . . . . . . . . .
Air Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . .
Down Conductors. . . . . . . . . . . . . . . . . . . . . . . . . . . .
WaveguideGrounding. . . . . . . . . . . . . . . . . . . . .
Exterior NonstructuralMetalElements . . . . . . . . . . . . . . . . . . .
ExteriorWiresandCahles. . . . . . . . . . . . . . . . . . . . . . . .
Conduit. . . . . . . . . . . . . . . . . . . . . . . . . . .
OverheadGuardWires. . . . . . . . . . . . . . . . . . . . . . . .
UndergroundGuardWires . . . . . . . . . . . . . . . . . . . . . . . .
Lightning Arrestors. . . . . . . . . . . . . . . . . . . . .
SecuritylPerimeterFences. . . . . . . . . . . . . . . . . . . . . . . .
SignalReferenceSubsystem . . . . . . . . . . . . . . . . . . . . . .
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HigherFrequencyNetwork. . . . . . . . . . . . . . . . . . . . . .
LowerFrequencyNetwork . . . . . . . . . . . . . . . . . . . . . . . .
Communications-Electronics(C-E)Equipment . . . . . . . . . . . . . .
Sig”alReferenceSubsystem . . . . . . . . . . . . . . . . . . . .
HigherFrequencyNetwork. . . . . . . . . . . . . . . . . . . . . . . .
Signal Isolation. . . . . . . . . . . . . . . . . . . . . . . . .
EquipmentSignalGroundTerminations. . . . . . . . . . . . . . . . . .
Shield Terminations or Coaxial and
OtherHigherFrequencyCables . . . . . . . . . . . . . . . .
Overall Shields. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fa”ltProtectionSubsystem . . . . . . . . . . . . . . . . . . . . .
General. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Personnel Protection . . . . . . . . . . . . . . . . . . . . . . . . . .
ACPowerNeutral . . . . . . . . . . . . . . . . . . . . . . . . . . .
IndividualPowerLineFilters . . . . . . . . . . . . . . . . . . . . . . . . .
Convenience Outlets . . . . . . . . . . . . . . . . . . . . . . . . .
Port.ahleEquipment. . . . . . . . . . . . . . . . . . . . . . . . .
Bonding. . . . . . . . . . . . . . . . . . . . . . . . . . .
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SurfacePlatingsorTreatments . . . . . . . . . . . . . . . . . .
Bo”dProtection . . . . . . . . . . . . . . . . . . . . . . . .
Corrosion Protection . . . . . . . . . . . . . . . . . . . . . . . .
CompressionBondsinProtectedArea$. . . . . . . . . . . . . .
Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BcmdingStraps. . . . . . . . . . . . . . . . . . . . . . . . . . .
Bo”dResistance . . . . . . . . . . . . . . . . . . . . .
Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sweat Solder. . . . . . . . . . . . . . . . . . . . . . . . . .
Brazi”gSolder . . . . . . . . . . . . . . . . . . . . . . . .
Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N“ts,Bolts,andWashers. . . . . . . . . . . . . . . . . . . . .
Direct Bonds. . . . . . . . . . . . . . . . . . . . .
Welding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brazi”gandSilverSoldering . . . . . . . . . . . . . . . . . . . .
BondingofCoppertoSteel . . . . . . . . . . . . . . . . .
Soft Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sweat Soldering. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SheetMetalorDuctWork . . . . . . . . . . . . .
Bolting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-ClampsandSpringClamps. . . . . . . . . . . . . . . . . . .
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