MIL-HDBK-1191
10.2.5
TRANSIENT PROTECTION. Systems that incorporate solid state
devices are susceptible to electrical system transients that can cause system
malfunction or equipment component damage. Unless specifically required for
specific items of equipment by the using Military Department and/or by an A&E
(designer) evaluation of solid state requirements for intensive care areas and
approved for installation by DMFO power conditioning equipment will normally
not be installed as part of the building electrical system at the utilization
point. Contractor-furnished, contractor-installed systems that utilize solid
state devices will be provided with transient protection. Static
Uninterruptible Power System (UPS) will normally be provided with the
equipment and system being served. However, requirement or provisions for UPS
will be determined on a project-by-project basis. Provisions for future
installed power conditioning equipment will be determined on a project-by-
project basis.
GROUNDING. System ground shall be adequate for safety and for
10.2.6
reliable operation of sensitive Users' and facility equipment. Typical
communications system equipment used in hospitals requires five ohm system
ground for proper operation. All grounding systems will be bonded together as
required by NFPA 70. See paragraph 10.4.8, "PATIENT CARE AREA GROUNDING for
further requirements."
10.3
ALTERNATE POWER SOURCE.
ALTERNATE ELECTRICAL SOURCE. The alternate electrical source will
10.3.1
conform to NFPA-70 and 99 except where Service criteria listed in "TABLE 10-1"
have more APPLICABLE REFERENCES stringent requirements. Additional load
capacity may be provided those hospitals assigned mobilization or mass
casualty response missions, or located in an area where extended power outages
are frequent. The emergency power source will be designed as a separately
derived power source. True RMS metering will be provided for load monitoring.
AMBULATORY CARE CENTERS and CLINICS. An alternate power source
10.3.2
shall be provided if required by NFPA-99 [TABLE 10-1 APPLICABLE REFERENCES] If
an on-site generator set is not required by NFPA-99 and 70, approval by
TMA/DMFO for a generator must be justified by the using Military Department.
The justification will address mission contingency requirements, local power
requirements, and safety for human life.
MEDICAL AND DENTAL CLINIC. Where any concentration of inhalation
10.3.3
anesthetic or intravenous sedation is used or any electrical life support or
resuscitative equipment is used in medical or dental clinics, an alternate
source of power is required in accordance with NFPA-70, paragraph 517-50, and
NFPA-99 . The alternate source of power will be either a generator, battery
system, or self-contained battery internal with the equipment and will have
the capacity to sustain its full connected load at rated voltage for a minimum
of 1 and 1/2 hours. The system will be so arranged that the alternate source
of power shall be automatically connected to the load within 10 seconds. The
essential electrical system will supply power for task illumination related to
life safety which is necessary for safe cessation of procedures and all
related anesthesia and resuscitation equipment.
HOSPITALS. The alternate power source will consist of two or more
10.3.4
engine generator sets designed to provide electrical power for hospital
essential electrical systems, plus 20 percent future load growth (Fig 10-1)
during the interruption of the normal power supply, as required by NFPA 70 and
NFPA 99. Where the essential electrical system load is less than 150KVA, one
generator may be considered. The experience level of available maintenance,
availability of parts, and factory service will be factored into CONUS and
OCONUS designs. The generator sets will be of equal capacity and ratings with
matched impedance and loss characteristics and designed to carry, in parallel
or through priority transfer equipment, the maximum demand load (linear and
nonlinear) of the essential electrical system. Motor starting and X-ray unit
momentary kva loads will be evaluated when sizing engine generator sets.
10-5
Previous Page
