Provide filter units for operation on electric power lines of [50] [60]
[and] [400] Hz rated [[_____] volts and amperes] [as indicated]. Design
filters to reduce conducted RF energy in electric power lines according to
MIL-F-15733 and UL 1283 for facility type power line filters. Insertion
loss between load side of filter and power supply side shall be not less
than [100 dB at 14 kHz to 10 GHz] [[_____] dB at [_____] to [_____]].
[Provide power factor correction coils for each filter unit.]
2.3
FILTER UNITS
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NOTE: When the use of a filter is required for the
neutral conductor, modify this paragraph as
appropriate. The use of a filter in the neutral
conductor shall be in accordance with the
requirements of MIL-HDBK-232A, "RED/BLACK
Engineering - Installation Guidelines."
**************************************************************************
Each filter unit shall be capable of being mounted individually and shall
include one filter for each phase conductor of the power line [and the
neutral conductor].
2.3.1
Filter Enclosure
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NOTE: The intent of this paragraph is to preserve
the integrity of the filter and to shield the input
and output circuits from each other. Usually, this
is accomplished by mounting the filters in an RF
modified NEMA Type 1 enclosure with separate
compartments for the input and the output terminals.
If a weatherproof or hazardous area type enclosure
is needed, it must be so specified.
**************************************************************************
Provide filter units in [RF modified NEMA Type [1] [_____] in accordance
with NEMA ICS 6] enclosures made of steel not less than 14 gage with welded
seams. Enclosures shall be hot tin dipped or primed with a coat of primer
after fabrication and welding.
2.3.2
Internal Configuration
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NOTE: When installation of the filter unit inside
of the shielded enclosure is required, the power
input terminal compartment shall be RF tight instead
of the load terminal compartment; and the filters
shall be located in the load terminal compartment.
This arrangement is necessary to prevent radiated RF
energy within the shielded enclosure from inducing
RF energy in the power conductors between the
filters and the point where the conductors pass
through the shielded enclosure wall. To provide for
this arrangement, change the wording as necessary,
i.e., change the word "Load" to read "Power Input"
and change the words "Power Input" to read "Power
Output" or "Load," as appropriate.
**************************************************************************
SECTION 16280N
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