MIL-DTL-23928/5C
REQUIREMENTS:
Class:1: Dripproof (see note 1).
Class 2: Totally enclosed (see note 2).
Class 3: Watertight (see note 3).
Dimensions and configuration: See figures.
Composition: Steel or aluminum (see note 5).
Current rating: 100 amperes (A).
Voltage rating: 500 volts alternating current and 250 volts direct current.
Short circuit capacity: 100,000 A.
Bus bar size (min0imum): 1 x 1/4 inch.
Circuit breakers: AQB-A102, AQB-A103, NQB-A101 (see MIL-DTL-17361).
NOTES:
1. Class 1 panels with doors shall meet the 45 degree dripproof requirements and panels without doors shall
meet the 15 degree dripproof requirements as defined by 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.
2. Class 2 panels shall meet the totally enclosed requirements as defined in MIL-STD-108.
3. Class 3 panels, with doors, gaskets, and drain opening, shall meet the watertight requirements as defined in
4. A power available indicator light shall be provided for each circuit breaker used for bus transfer switching.
The indicator light shall be placed in close proximity to the circuit breaker to which it refers and shall
illuminate when power is available.
5. Unless steel is specified in the acquisition document, panels shall be of aluminum construction.
Referenced documents. In addition to MIL-DTL-23928, this document references the following:
The margins of this specification are marked with vertical lines to indicate where changes from the previous issue
were made. This was done as a convenience only and the Government assumes no liability whatsoever for any
inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document
based on the entire content irrespective of the marginal notations and relationship to the last previous issue.
Custodians:
Preparing activity:
Navy - SH
DLA - CC
DLA - CC
(Project 5925-2011-008)
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using the
ASSIST Online database at https://assist.dla.mil.
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