MIL-DTL-16036M(SH)
b. Bus connections greater than 4 inches from the bus/component stud connection shall meet the clearance
values of table I.
c.
Creepage distance shall be in accordance with values provided in table I.
3.10.18.2 Bus connections. The ends of bus bar connections to the studs of 100-ampere circuit breakers shall
be trimmed to a radius equal to one half the width of the bus bar.
3.10.18.3 Holes in bus bars. All 1/8- by 3/4-inch bus work that connects to 100-ampere circuit breaker bases
shall be manufactured with 13/32-inch holes.
3.11 Wiring of control and instrument circuits.
3.11.1 Control and instrument cable types. Cables used for control and instrument circuits, ground detector,
indicator lights, communications devices, and other parts shall conform to NEMA HP 6, Type SSB, 392 °F (200 °C).
Control and instrument wiring shall not be smaller than size AWG 16 of NEMA HP 6, Type SSB, 392 °F (200 °C),
but may be larger, if necessary, for current carrying capacity requirements. Communication device wiring shall not
be smaller than size AWG 20 of NEMA HP 6, Type SSB, 392 °F (200 °C). Control cable for low-level signals for
electronic devices and load sharing shall be shielded type. The flexible strand wire shall be used for wiring between
hinged panels and the stationary structure, when applicable. Cables within each unit shall be of the same solid color.
3.11.2 Cable end connectors. Ends of each wire shall be connected to the apparatus studs by means of an
accepted solderless terminal or by forming a wire loop around the apparatus stud or terminal screw and retaining the
loop in a cup or crimped washer. The wire loop shall be soldered to secure the strands together. Locking devices in
accordance with 3.5.12 shall be used to secure the nuts or screws connecting wire loops to the apparatus connection
point. See figure 17 for illustration of wire connections.
3.11.3 Forming and securing switchgear power cables and control wiring groups.
3.11.3.1 Power cables. Power cable groups shall adhere to the following requirements:
a. Cables shall be neatly formed into groups which shall be bundled or banded and supported or clamped in a
manner that will prevent chafing of the insulation caused by vibration. Cables shall not be supported by bus bars.
There shall be a minimum clearance of 1/4 inch between cables and bus bars to prevent abrasion under conditions of
vibration, except at the bus bar terminating end of the cable.
b. Cable straps or metal clamps may be used to support or secure cables, but where metal is used it shall be
covered with a flame-retardant, heat-resistant material which will prevent chafing of the cable insulation.
Commercial nylon cable straps are not permitted for use to support or secure power cables to the framework or
structure of the switchboard unit.
c. There shall be no splices in the cable and connections shall be made at the terminal studs of the devices or
terminal boards.
3.11.3.2 Control wiring. Control wiring shall adhere to the following requirements:
a. Wires shall be neatly formed into groups which shall be bundled or banded and supported or clamped in a
manner that will prevent chafing of the insulation caused by vibration.
b. Bundling material shall be either nylon straps, nonflammable cord, glass fiber tape conforming to Type SR-
1 of MIL-I-3158, or pressure sensitive adhesive plastic tape conforming to MIL-I-24391. The last two materials are
specifically adapted for serving switchgear control wiring in locations subject to abrasion. Glass fiber tape may be
coated with adhesive on one side, but when used with this adhesive coating, it shall be covered with pressure
sensitive adhesive plastic tape for permanent adhesion.
c. Wire groups running from hinged panels shall be formed and clamped so that sharp bends do not occur with
the panel in either the open or closed position and shall be connected to terminal blocks on the fixed portion of the
switchgear structure.
d. There shall be no splices in the wire and connections shall be made at the terminal studs of the devices or
terminal boards.
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