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 MIL-HDBK-419A
Provide adequate surge protection for emergency power equipment.
q.
r.
Do not rely on fuses or circuit breakers for EMP protection.
s.
Provide automatically closing doors in preference to manually closed doors.
t.
Put single-phase protection on each phase of S-phase power systems as well as on the neutral.
u.
Use passive low pass L-C radio interference filters on signal, control, and telephone lines.
Since electromagnetic fields in the corners of a shielded structure are usually higher than in other
v.
parts of the structure, when convenient do not locate known sensitive equipments in corners.
1.11 MILITARY MOBILE FACILITIES.
1.11.1 General Tactical Grounding Requirements.
1.11.1.1 Facility Ground System. The facility ground system connects any metallic element of the associated
subsystems to earth by way of an earth-electrode configuration. It establishes a reference potential common to
any equipment or subsystem, and makes the ground potential available throughout the system. This section
describes the four subsystems that comprise the facility ground system and should be addressed during the
design and installation of any electrical and electronic equipment, subsystem, and system. Although, it is not
possible to have a fixed set of rules governing the grounding of all conceivable electrical or electronic
equipment or system configurations, the guidelines presented here should be adapted to the requirements of a
particular tactical installation.
1.11.1.1.1 Earth Ground. A good, basic earth ground or earth electrode subsystem is the fundamental network
for establishing a ground point for the three remaining ground subsystems; lightning/EMP, signal reference, and
fault protection. An ideal earth electrode subsystem will provide a common potential reference point anywhere
in the system to eliminate undesirable voltages and currents.
1.11.1.1.1.1 General Earth Electrode Subsystem Requirements. An earth electrode subsystem is a network of
electrically interconnected rods, plates, mats, or grids installed with a system to establish a low-resistance
contact with earth. As a design objective, the dc resistance to earth of the earth electrode subsystem should
not exceed 10 ohms.
1.11.1.1.1.2 Earth Electrode Subsystem Types. There are earth electrode subsystems for the following two
types of facilities:
a.
Fixed Site Facilities. Descriptions of earth electrode subsystems installed in fixed facility or
semi-permanent buildings or installations are contained in Sections 1.2 and 1.4.
l-177
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