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|  MIL-S-17000N(SH)
3.5.1.1 Fastener hardware. Thread cutting and self-tapping screws shall
not be used. A lock washer shall be installed under the head of other than
flat head machine screws. Flat head machine screws shall be secured with a
locking compound in accordance with MIL-S-22473 applied to the thread of the
screw.
3.5.2 Enclosures.
3.5.2.1 General. Switchboard section enclosures shall be fabricated
from aluminum shapes or formed members and sheets by welding or bolting in
accordance with the structure shown in the applicable specification sheet.
Control indicators shall be fabricated in accordance with the structure shown
in the applicable specification sheet. Framework of deck mounted switchboard
sections shall have sufficient strength to support the door, where applicable,
in any position with only the deck mounting bolts installed.
3.5.2.2 Enclosure design. Design of enclosures shall be in accordance
with the applicable specification sheet. Enclosures shall be perpendicular,
parallel, and flat in accordance with the applicable specification sheet
when tested in accordance with 4.6.11.
3.5.2.2.1 Geometric control of enclosures (deck mounted). Switchboard
enclosures shall--be perpendicular, parallel, and flat inaccordance with the
following (see figure 1):
(a) The base of the assembled switchboard section enclosure,
consisting of a front and back section, is designated surface
"A" which is to interface with the shipboard site installation
mounting foundation (see figure 1).
(b) For switchboards of more than one section, surface "A" shall
include the base plane of all sections and surface "D" shall
include the front surface plane of all sections. Prior to
delivery, each switchboard shall be tested for compliance
with the requirements listed (see 4.6.11). All sections of
multiple section switchboard shall be assembled on a common
foundation and bolted together with their intersection fastening
hardware for this test.
3.5.2.2.2 Geometric control of enclosures (bulkhead mounted). Switchboard
enclosures shall be perpendicular, parallel, and flat in accordance with the
following (see figure 2):
(a) The mounting surface of the assembled switchboard enclosure,
is designated surface "A" which is to interface with the
shipboard or site installation mounting foundation (see
figure 2).
3.5.2.3 Size. Size of switchboard sections (see 6.5.2) and control indi-
cators (see 6.5.5) shall be in accordance with the requirements of the applica-
ble specification sheet.
3.5.2.4 Degree of enclosure. Degree of enclosure of switchboards and
control indicators shall be as specified in 3.5.2.4.1 and 3.5.2.4.2 and shall
be in accordance with MIL-STD-108.
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