MIL-DTL-23928/1E
NOTES:
1. Dimensions are in inches.
2. Unless otherwise specified herein, tolerances shall be as follows:
Two place decimals: ± 0.02.
Three place decimals: ± 0.005.
3. Class 1 panels with doors shall meet the 45 degree dripproof requirements, and panels without
doors shall meet the 15 degree dripproof requirements in accordance with MIL-STD-108. When
used, drip shield dimensions shall be as required to provide the specified degree of enclosure.
Panels shall be furnished without doors only when specified in acquisition documents.
4. Class 2 panels shall meet the totally enclosed requirements in accordance with MIL-STD-108.
Panels shall be furnished without doors only when specified in acquisition documents.
5. Class 3 panels, with doors, gaskets, and drain opening, shall meet the watertight requirements in
accordance with MIL-STD-108.
6. The following types of circuit breaker mounting bases may be installed:
(a) Single phase (1ø):
Type A (see MIL-C-17588) four breakers, 2 circuit base, øAB or øBC.
Type B (see MIL-C-17588) four breakers, 2 circuit base, øAC.
Type 3ø mounting base-six breakers.
(b) Three phase (3ø):
Type (3ø) mounting base-six breakers.
7. When a combination of 1ø and 3ø circuits are required, the number of each type circuit shall be
specified in the acquisition document.
8. Panels shall be provided with a retaining device to hold all circuit breakers in place when the
shield is removed.
9. Panels shall be of aluminum construction unless steel is specified in the acquisition documents.
10. Panels shall be furnished with mounting blocks.
REQUIREMENTS:
Class: 1 - Dripproof (see note 1).
Class: 2 - Totally enclosed (see note 2).
Class: 3 - Watertight (see note 3).
Composition: See table I.
Current rating: See table I.
Voltage rating: 125 V ac and V dc.
Short circuit capacity: 50,000 amperes.
Bus bar size: 1 x .250 inch.
Bus bar feeder connection: Top and bottom.
Circuit breakers: ALB-1 and NLB-1 (see MIL-C-17588).
6