MIL-HDBK-1191
and 4102, modified to meet the additional safety requirements described
herein.
a. The normal and alternate (emergency) power system
configuration and protocol shall comply with paragraphs 10.2 and 10.3
covered herein, and those requirements mandated by the National Fire
Protection Association (NFPA) standards 70, 99 and 110 for the appropriate
medical facility type. The normal and alternate (emergency) power system
shall be separate and independent (separate derived source) with single-
point grounding that incorporates an uninterruptible power supply (UPS) to
bridge the 10 second delay between loss of normal power and restoration of
essential functions by the alternate power source for operating rooms,
recovery rooms, and other critical areas.
b. Automatic transfer switches (ATS)s with bypass/isolation
switches (BP/IS) shall be of the double throw, four pole, draw-out
construction complying with paragraph 10.3 and with the requirements of
NFPA 70 and 99.
c. Mechanical protection of the normal and emergency system
power cables shall be achieved with metallic cable tray, fully enclosed for
emergency cables. Essential power branches of the emergency power system,
Critical -1, Critical -2, and Life Safety, may be installed in the same
cable tray if separated by full height, continuous metallic barriers; the
Emergency Equipment branch may be installed in the same cable tray as
normal power cables if similarly separated by a full height, continuous
metal barrier. When sufficient distribution space is available, complete
separation of each branch of the emergency power system in separate cable
trays is preferred to minimize the chance of intermingling of cables. All
cable trays shall be bonded to ground and each section continuously bonded
to the next.
d. Essential branch cable shall be 30, 60 or 90 minute fire
rated type NHXCH, including an insulated, properly color-coded grounding
conductor, and a concentric, copper conducting shield to be utilized as a
second (redundant) grounding conductor.
e. Normal power cables shall be type NYCY cable, including an
insulated, properly color-coded grounding conductor and a concentric,
copper conducting shield to be utilized as a second (redundant) grounding
conductor.
f. Circuit grounding conductors shall be so installed that
removal of a receptacle or other device will not interrupt the return
ground path, in accordance with NFPA 70 and 99.
g. Circuit protection against electromagnetic interference
(EMI) and radio frequency interference (RFI) shall be achieved by the use
of cable shielding, and compliance with DIN VDE minimum separation
distances to medical equipment.
10.1.2
DEFINITIONS.
10.1.2.1
NFPA-99 and 70 discuss various minimum safe practices, and safety
requirements for "General Care", "Critical Care" and "Wet Locations." Defense
Medical Facility Office (DMFO) has identified the following patient care areas
for hospitals as "Critical Care Areas" where patients may be subjected to
invasive procedures and connected to line-operated electromedical devices:
a.
Operating rooms.
b.
Delivery rooms and Labor and delivery rooms.
c.
Cystoscope rooms.
d.
Oral Surgery Maxillofacial surgery, Perodontics, and
Endodontics.
e.
Recovery (surgery, and labor recovery beds).
10-2
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