MIL-HDBK-1191
only after approval has been obtained from TMA/DMFO by the using Military
Department.
10.4.10
ELECTROMAGNETIC SHIELDING FOR MEDICAL INSTRUMENTATION.
Designated areas of hospitals and health research laboratories may require
electromagnetically shielded enclosures. The degree of the attenuation
required for the enclosure will be based on the manufacturer's recommendation
for the instrumentation to be used in the designated space. Shielded
enclosures will conform to the requirements of MIL-E-8881. Final design will
specify the type of enclosure and the class of attenuation required. When
shielded enclosures are not provided, other measures will be taken to limit
RFI and EMI in rooms which contain sensitive medical equipment, including the
EEG room and electron microscope room. Incandescent lighting fixtures will be
used. Rooms will not be located near or directly above or below electrical
equipment or mechanical rooms. High voltage feeders will not be routed in the
vicinity of these rooms.
10.5
LIGHTING.
DESIGN . Lighting design will conform to the requirements of
10.5.1
these standards. Electronic ballast are not recommended in areas of medical
facilities where electronic (life support) medical equipment is used or areas
where invasive procedures are performed, due to possible interference with the
equipment. Some examples are operating rooms, delivery rooms, laboratories,
special procedure rooms, MRI areas, Medical equipment repair and test areas
and other areas of similar use. In no instance shall the lighting footcandle
level exceed plus 10 percent for 538.7 Lux (50 footcandles) and plus 53.8 lux
(5 footcandles) percent for lower levels. Emergency egress lighting will
conform to the requirements of NFPA 101 and the exit signs will conform to the
following requirements:
a.
Stencil faced exit signs are recommended.
b.
The transilluminated letters will normally be red except
where state or country standards mandate green.
c.
The contrast level of the letters shall be
symmetrical with not less than a 0.7 value, plus
or minus 5 percent.
d.
The lumination output for normal and emergency mode will be
not less than 70 cd/sq m. measured across the face of the
sign.
e.
The surface finish shall be a matte texture.
f.
LED exit signs must meet the above performance
criteria and carry a manufacturers certificate of
compliance.
Lighting design and switching will incorporate energy efficient features
whenever practicable and consistent with lighting criteria and the
functional/operational intent of the hospital. Fluorescent lighting will be
provided to the maximum amount practicable, except that infrequently used
small storage spaces and janitor's closets may be provided with incandescent
fixtures. Exterior lighting will normally be high pressure sodium vapor
fixtures. Recessed fluorescent fixtures will be provided in rooms with lay-in
acoustical tile ceilings. Fluorescent fixtures may be recessed or surface
mounted in rooms with gypsum board on plaster ceilings. Industrial type or
open strip type fluorescent fixtures will generally be used in rooms with
unfinished ceilings. Fixtures in large storage/supply rooms will be mounted
to readily permit relocation within several feet. Fluorescent lamps will
normally be 34/40 watt energy saving or 32 watt T8, cool white type, except
that 32 or 40-watt chroma 50 type color corrected lamps may be used.
Normally, 32 or 40-watt lamps on dimming circuits will be provided as required
by Appendix "A" and as indicated herein. Lighting fixtures with color
improved lamps will be identified for lamp replacement by an appropriate
marking on the fixture reflector. Marking should indicate lamp replacement
with the actual design lamp by name only and should not be visible through the
10-19
Previous Page
