MIL-STD-1399-300 Electric Power, Alternating CurrentThis military standard section establishes electrical interface characteristics for shipboard equipment utilizing AC electric power to ensure compatibility between user equipment and the electric power system. Characteristics of the electric power system are defined and tolerances are established, as well as requirements and test methods for ensuring compatibility of shipboard user equipment with the power system. The policies and procedures established by MIL-STD-1399 are mandatory. This section and the basic standard are to be viewed as an integral single document for use in the design and testing of electric power systems and user equipment.

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MIL-STD-1399-3008

5.2.12  Active ground detection.  When energized, user equipment rated at nominal 440 Vrms shall tolerate the additional application of 150 VDC between each power conductor and ground without equipment damage, arc-over, degradation, or abnormal operation.  When energized, user equipment rated less than nominal 440 Vrms shall tolerate the additional application of 50 VDC between each power conductor and ground without equipment

damage, arc-over, degradation, or abnormal operation.

5.2.13  Passive ground detection.  Passive ground detection is accomplished by using the visual intensity of indicator lights connected from line to ground to determine grounded conditions.  User equipment shall operate at nominal voltages.

5.3  Test requirements.  This section specifies test requirements and the associated test procedures.  User equipment test requirements are intended to verify compliance to the user equipment interface requirements in this standard when tested in accordance with the procedures specified herein (see 6.2).  For user equipment testing, the hardware and software of a Unit Under Test (UUT) shall be representative of production.  NAVSEA reserves the right to tailor test requirements.

5.3.1  Voltage and frequency tolerance test.  This test shall be used to evaluate the performance of user equipment under the voltage and frequency conditions of Table II, as applicable.  The operation of the user equipment shall be within the manufacturer's defined operating parameters when tested to the voltage and frequency conditions of Table II, as applicable.

TA8LE II.  Voltage and frequency tolerance test.

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