MIL-DTL-24646B
4.6.5 Temperature rise. The fuse boxes shall be energized at rated voltage and current and the temperature of
current carrying parts and the enclosures interior ambient temperature recorded when temperature readings have
stabilized. Temperature sensitive elements, such as thermocouples of small wire (28-32 AWG), shall be placed on
the current carrying parts and suspended approximately one-half inch below the cover. Temperature stabilization
shall be considered to have occurred when three successive readings taken at one-half hour intervals are within plus
or minus 1°C. Failure to conform to 3.6.4 shall be cause for rejection.
4.6.6 Salt atmosphere. Fuse boxes shall be tested as specified in method 101, test condition A of MIL-STD-202.
Evidence of excessive corrosion shall be cause for rejection (see 3.6.5).
4.6.7 Effectiveness of enclosure. Fuse boxes shall be tested as specified in MIL-STD-108, except they shall not
4.6.8 Vibration. The fuse boxes shall be subjected to the type I vibration test as specified in MIL-STD-167-1. The
following details and exceptions shall apply:
a.
Frequency: The variable frequency tests shall be omitted.
b.
Electrical test conditions: The circuits shall be energized at rated voltage. Test equipment shall be used to
monitor the output voltage on fuse boxes.
c.
Rejection criteria: Failure to conform to 3.6.7.
4.6.9 Shock. The fuse boxes shall be subjected to the high-impact shock test for grade A, type A, class I
equipment as specified in MIL-S-901. The following details shall apply:
a.
Electrical test conditions: The circuits shall be energized at rated voltage. Test equipment shall be used to
monitor output voltage on fuse boxes.
b.
Rejection criteria: Failure to conform to 3.6.8 except fuse failure shall not be cause for rejection.
4.6.10 Magnetic permeability. The relative permeability of the enclosures, less switches, shall be checked using a
low-mu indicator as specified in ASTM-A342/A342M and shall have a permeability not greater than 2.0.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The fuse boxes are used to distribute electrical power to branch circuits and provide fused
protection of the feeder circuit. Boxes with switches provide selective control of power distribution to branch circuits.
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