MIL-DTL-16036M(SH)
c.
One indicator light (white) to indicate when the shore connection feeder is energized.
d.
One indicator light (white) to indicate when the bus tie feeder is energized.
e. Warning plate adjacent to the indicator lights for the shore connection and bus tie feeder stating "DO NOT
CLOSE THIS CIRCUIT BREAKER WHEN THE BUS TIE CIRCUIT IS ENERGIZED".
3.4.5.2.3 ACB distribution circuit. For installations not requiring a bus tie unit, items (a), (b), and (c) of
3.4.5.2.2 shall be mounted on one of the ACB distribution circuit breaker units and the shore power circuit
connected to the switchboard bus. In such instances, this unit shall be designated as "ACB distribution circuit
breaker and shore power unit", and the following additional equipment shall be provided:
a.
One indicator light (white) to indicate when the switchboard bus is energized.
b. Warning plate adjacent to the indicator lights to warn against closing the shore connection circuit breaker
when the switchboard bus is energized.
3.4.5.3 DC, AQB circuit breaker distribution unit. Unit shall provide for the distribution of power or lighting
through Type AQB, 250-volt, DC circuit breakers as specified (see 6.2).
3.5 Switchboard construction.
3.5.1 General construction methods. Each section of a switchgear group may be constructed using alternate
methods of construction that differ from the traditional welded frame. Equivalent geometries shall be used to match
the traditional welded frame dimensions and features given by this specification. The performance requirements of
the switchgear sections shall be the same as traditional welded frame construction.
3.5.1.1 Standardized switchgear sections. (see 6.3.9) Each unit of a switchgear section shall be in accordance
with the applicable unit shown on figure 7, figure 8, and figure 9 and applicable notes on the figure. Units shall be
constructed with a self-supporting, box-like framework for support of the front panels, bus work, circuit breakers,
and other devices to be included in the various units which constitute the section. Number and size of circuit
breakers and overall dimensions of the unit shall be in accordance with figure 7, figure 8, and figure 9. Units shall
be bolted together to form sections and shall be connected by transverse buses. Bus locations shall be as shown on
figure 9, except where bus locations are not so specified, they shall be installed to suit the application. Each unit and
enclosure shall be constructed to meet the requirements of MIL-STD-167-1 and MIL-S-901 (see 4.4.3.3 and
3.5.1.2 Special switchgear sections. Each section of a switchgear group shall be constructed with a rigid, self-
supporting, box-like framework for support of the front panels, bus work, circuit breakers, and other devices to be
included in the various units which constitute the section. Framework for a section may be constructed as an
integral frame for all units, joining the individual units by bolting and welding to form the section. Where each edge
of the unit is formed by welding formed members, the ends joining to form a section shall be welded, including
necessary intermediate welding of the joining members to add strength and rigidity to the section. When formed
members are used for structural support, their strength shall be equivalent to that of structural members (angles,
channels, and so forth) used for the same application. Each unit and enclosure shall be constructed to meet the
3.5.2 Dimensions. Insofar as practicable, the grouping of the various units that comprise a switchgear group
shall be such that the length of each section is approximately equal to the height; however, the length of a section
shall not exceed 10 feet. In the arrangement of the devices to be located within the structure and the general design
of the unit, particular attention shall be given to keeping the center of gravity of the unit as low as practicable.
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