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

5.2.9.2 60 Hz user equipment less than 1 kVA. The operation of user equipment with power ratings < 1 kVA shall be current amplitude limited so that no individual harmonic line current or current of any frequency above the fundamental at 60 Hz to 20 kHz shall exceed the limit line set at a magnitude of 6000/f percent of the user equipment's full load fundamental current where f is the frequency. This is shown in Figure 18.

FIGURE 18. Limit line for currents at frequencies greater than 60 Hz for equipment less than 1 kVA.