MIL-DTL-917F(SH)
6.4.2 Test process. If there is no similar accepted design, a design can be established as acceptable by running
the following tests, in the order listed, on two typical units of the same design from each group of similar units from
the same manufacturer. The definition of similar is specified in 6.4.1. These tests are as specified in the
qualification tests of MIL-PRF-27, except as modified herein.
Test Number
Description
1
Winding continuity
2
Visual and mechanical examination (external)
3
Terminal strength
4
Dielectric strength (except that the dielectric test voltage should be not less than 500 Vrms)
5
Induced voltage
6
Insulation resistance
7
Temperature rise
8
Vibration (maximum frequency 33 Hz)
9
Shock (Method II of MIL-PRF-27)
10
Immersion
11
Winding continuity
12
Insulation resistance
13
Dielectric strength (90 percent of initial)
14
Induced voltage
Prior to testing, approval of the contracting activity should be obtained for the proposed grouping and the units
selected as typical. The test data should be submitted to the contracting activity for approval.
6.4.3 Similarity process based on approved items. When the contracting activity is satisfied that the units
compare with a single unit with tested and approved mechanical design characteristics in accordance with 6.4.1, a
given design may be established without testing the units.
6.5 Definitions and nomenclature. For names, definitions, and delineation of items used by the Department of
Defense, the contractor's attention is invited to Cataloging Handbook H6-1, Section A, Part I of Federal Item
Identification Guides for Supply Cataloging, Alphabetical Index of names. Copies of this publication are available
for examination at any office of the Government inspector. For names and definitions of electrical terms, the
contractor's attention is invited to IEEE 100, Standard Dictionary of Electrical and Electronics Terms. This
publication may be obtained from the Institute of Electrical and Electronic Engineers, 445 Hoes Lane, P.O. Box
1331, Piscataway, NJ 08855-1331 or online at www.ieee.org.
6.5.1 Ampacity. Ampacity is the maximum amount of electrical current a conductor or device can carry before
sustaining immediate or progressive deterioration.
6.5.2 Clearance distance. Clearance distance is the shortest point-to-point distance in air between uninsulated
energized parts or between an uninsulated energized part and ground.
6.5.3 Creepage distance. Creepage distance along the surface of an insulating material is the shortest distance
between uninsulated energized parts or between an uninsulated energized part and ground.
6.5.4 Grounding. Grounding is defined as connecting a point of electrical equipment to the ship hull or ground
point for intentional or other reasons.
6.5.5 Leakage current. Leakage current is defined as the current through the parasitic resistances and
impedances continuing through a human body, if the safety equipment ground is open.
6.5.6 Volt-ampere ratings. The product of the normal voltage applied to the circuit times the current carried.
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