MIL-DTL-23928G
3.4.1.4 Cable entrance. Unless otherwise specified (see 6.2), enclosures shall have removable cable plates top
and bottom. The cable plates shall be furnished blank and of adequate size to accept terminals or stuffing tubes for
passage of power cables in accordance with MIL-DTL-24643, MIL-DTL-24643/15, and MIL-DTL-24643/16. The
plates shall be sealed to the level of effectiveness of the enclosure.
3.4.1.5 Panel mounting. The location of mountings shall be as specified (see 3.1). The enclosure shall support
the total assembly of the panel, breakers, and associated hardware by the mounting means specified. Unless
otherwise specified, the diameter of the panel mounting holes shall be approximately .0625 inch (1.59 mm) larger
than the bolt size indicated (see 3.1). Tolerance for placement of mounting holes shall be .015625 inch (0.40 mm).
3.4.1.6 Circuit breaker retainer device. Panels using ALB-1 or NLB-1 circuit breakers shall be provided with a
retaining device to hold circuit breakers in place when the shield is removed.
3.4.2 Mechanical properties.
3.4.2.1 Size. The physical dimensions shall be as specified (see 3.1). Dimensions do not include door handles,
latches, or drip shields. Unless otherwise specified (see 3.1), the tolerance for sheet metal enclosures shall be plus
or minus .030 inch (0.76 mm).
3.4.2.2 Wiring size. Adequate cabling space shall be provided for power input and branch circuit cabling. These
wiring spaces shall be not less than the minimum spaces as shown on figure 1.
3.4.2.3 Component spacing and arrangement. Unless otherwise specified (see 3.1), component spacing and
arrangement within the panels shall conform to the following:
a.
Current carrying parts shall be arranged to avoid over-heating due to inductive effects.
b.
When mounting blocks are omitted, there shall be not less than .062 inch (1.57 mm) of insulation (see
3.3.4.1) between the base of a circuit breaker and the metal cabinet against which the base is mounted.
c.
Panels shall be designed for circuit breaker mounting in the horizontal or vertical position. When designed
for vertical mounting, the up position of the breaker handles shall be the ON position, and when designed
for horizontal mounting, the ON position shall be toward the center.
d.
Interlocks required for transfer panel circuit breakers, or for panels employing circuit breakers as transfer
switches, shall be suitable for use with circuit breakers of a specific type, regardless of the contractor,
without modification other than possible reassembly of the interlock.
3.4.3 Electrical properties.
3.4.3.1 Rating of panels. The current rating of the panel shall be based on the maximum number of breakers that
may be installed times the maximum continuous ampere rating for the circuit breaker frame size, except the panel
rating shall not exceed 400 amperes. The panel voltage shall be the same as the voltage rating of the largest circuit
breakers installed.
3.4.3.2 Number of circuits. The number of branch circuits shall be one, or in multiples of two as specified (see
3.1), but shall not exceed 16 for 3-phase panels, or 24 for single phase panels.
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