Separate load terminal compartment from power input compartment by a solid
steel barrier plate of same gage as filter unit enclosure extending across
entire width of enclosure. Power input compartment shall house individual
power line filters and power input terminals of filters.
2.3.3
Individual Filter Mounting
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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.
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Attach load terminal end of individual filter cases to RF barrier plate
between the two compartments to provide an RF tight seal between RF barrier
plate and filter case. Load terminals of filters shall project through
openings in the RF barrier plate into the load terminal compartment. Attach
case of each filter to enclosure to prevent stress from being applied to RF
seal between filter case and RF barrier plate.
2.3.4
Neutral Connection
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NOTE: If the use of a filter is required for the
neutral conductor, delete this paragraph.
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When neutral conductor is not filtered, route it through the enclosure and
connect it to a stud welded to each side of the RF barrier plate, so that
the neutral is electrically connected to the filter unit enclosure.
2.3.5
Conduit Connections to Enclosures
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NOTE: If no drawings are furnished with the
specification, revise this paragraph to specify the
hub locations and size. The conduit hub size shall
meet the minimum requirement of NFPA 70 for wire
sizes required to carry the full load current of the
filter.
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Load terminal and power input compartments shall have no knockouts, and
each compartment shall have one threaded conduit hub. Seam weld hubs in
place and size and locate hubs as required for conduits indicated.
SECTION 16280N
Page 8
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