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Switching Equipment, Combat System, Command and Control, Fire Control, And Interior Communication General Specification
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MIL-S-17000N(SH)
3.6.10.1 Only one wire shall be crimped to a terminal lug or a single
connector contact except where specified in the ATDP for DLS switches and where
a double wire crimp contact in accordance with MIL-C-28731/23 is used on class
LS switches.  When the double contact is used an insulated sleeve (class 1,
black, in accordance with MIL-I-23053 and MIL-I-23053/5) shall be installed
over the double contact after the wires are crimped.  In-line splices shall
not be used as a substitute for the double wire contact.  Frequency used combina-
tions of wires that may be crimped in the double contact are as follows:
(a)
Two
16-AWG
wires
(b)
Two
18-AWG
wires
(c)
Two
20-AWG
wires
(d)
One
20-AWG
wire and one 16-AWG wire
3.6.11 Terminal boards.  Terminal boards shall be of the stud type in
accordance with MIL-T-55164 as specified in the ATDP and as specified in 3.6.11.1
through 3.6.11.4.
3.6.11.1 The maximum number of wires to be connected to any one terminal
shall be as specified in the applicable specification sheet of MIL-T-55164. In
wiring these terminal boards with the terminal lugs specified in the applicable
specification sheet of MIL-T-55164, lock washers are not required.  The studs of
terminal boards, except those designated to receive ship wiring, shall be fitted
with a full complement of barrel nuts.  Barrel nuts for securing the terminal
lugs of ship wiring shall not be assembled on the equipment but shall be fur-
nished in sturdy textile bags (one size per bag) and packed as required in 5.1.3.
Solder type terminals boards shall not be used.
3.6.11.2 Terminal board mounting.  Terminal boards for receiving ship
cables on other than types VI and IX switchboards shall be secured to a fixed
portion of the enclosure, not to hinged panels or other movable assemblies that
may require flexing of the ship wiring during normal operation or servicing.
Terminal boards shall be mounted so that they will not be broken or stressed
by distortion of the enclosure.  Terminal boards shall be secured only by
machine screws threaded into the supporting member (an insert is required in
accordance with requirement 12 of MIL-STD-454 if the tapped material is aluminum
alloy) and shall be capable of ready removal of replacement.  Access to the
backside of the supporting member shall not be required for removal of terminal
boards.
3.6.11.3 Spare module terminals.  At least 20 percent of the terminals on
each module shall be spares.  Spare terminals shall not be wired to the module
connectors.  These spare terminals are initial design requirements and may be
used during development of the design.
3.6.11.4 Terminating large conductor ship cables. Provision shall be made
for terminating large conductor ship cables for power supplies to switchboard
busses or those that may be increased in size for voltage drop considerations
by the use of jumper straps or terminal boards with larger current ratings as
specified in requirement 1 of MIL-STD-1657.  The large terminal boards shall be
located on modules located in the lower positions of the back section.  In some
instances, internal switchboard branch circuits may require the use of more
than one terminal on a terminal board.  Jumper straps shall be provided to
30

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