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Grouping of circuits and conductors |
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|  MIL-S-17000N(SH)
3.6.27.1 Grouping of circuits and conductors. Circuits shall be carried
through the switchboard on the same type of wire as that of the external ship
cable. For example, where a circuit enters the switchboard on a twisted triad
shielded cable, the circuit within the switchboard shall be run in a twisted
triad cable (type 3SJ of MIL-C-915/60 without the shield) (see 3.6.20.1.3).
Where a synchro excitation circuit enters the switchboard on a twisted triad
shielded cable, the circuit within the switchboard shall be run in a twisted
pair cable (type 2SJ of MIL-C-915/60 without the shield) (see 3.6.20.1.3).
Conductors of associated circuits such as synchro excitation, synchro signal,
associated reference, and response, and including the shielded connection for
shielded circuits to back section module terminals (see 3.6.27.2), shall be
connected to adjacent terminals, switch contacts or plug connector contacts.
For example, ship wire designations 36GNA11B130, 36GNA11B130R, 36GNA11B130S,
36GNA11B131, 36GNA11B132, 36GNA11B133, 36GNA11B131S, 36GNA11B134, 36GNA11B135,
36GNA11B136, and 36GNA11B134S shall be connected to adjacent terminals on a
back section module terminal board.
3.6.27.2 Shielded wiring. Shielded wiring for scaled voltage circuits
shall be installed through the back section modules, harness wiring, switches,
and other panel assemblies as shown in the ATDP. For other 400 Hz circuits,
the ship cable shields shall be terminated and grounded at the back section
terminal board or cable connector plug. The method of terminating and grounding
shields at cable connector plugs shall be in accordance with Sunbank Drawing
SE95, or equal. See figures to requirement 20 of MIL-STD-1657 for typical
connections.
3.6.27.3 Harness wiring. Use of preformed cables and wiring harnesses is
preferred to the point-to-point method of wiring. The following requirements
shall be taken into consideration in fabricating wiring harnesses:
(a) In-line splices shall not be used. Wire shall be crimped as
specified in the ATDP. Where LS style switches require a double
wire, use MIL-C-28731/23 double contact (see 3.6.10.1).
(b) Wiring from panel-mounted assemblies, circuit breakers, or
switches shall connect to back section modules or terminal
boards at approximately the same horizontal level.
(c) Wiring between panel-mounted assemblies, circuit breakers, or
switches in different horizontal rows shall be kept to the abso-
lute minimum. This wiring, if required, shall be run on the side
of the door or in the hinge riser, not on the back of the door.
(d) There shall be a minimum of intersection connections consistent
with the requirement of 3.6.3.5.
(e) Flexible harness loop shall have a vertical portion of at least
6 inches in the area of the door hinge to permit twist of the
harness. Whenever possible, the flexible harness loop shall be
pretwisted so that zero twist shall be at a point equal to half
the maximum opening of the door. The vertical riser (if existing)
which results from the crossing of the flexible wiring between
switches and modules shall be located as shown on the applicable
specification sheet. Flexible wiring shall be arranged so that
the crossing of wiring in the vertical riser (if existing) is
minimized.
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