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

FIGURE 15. Type III, 115 Vrms, 400 Hz power - worst case and user voltage tolerance envelopes.

5.1.6.2.3 Voltage spike characteristics. Voltage spikes of 2,500 V peak on 440 Vrms systems, 1400 V peak on

230 Vrms systems (special power classification), and 1,000 V peak on 115 Vrms systems may be present on the electrical power system between line-to-line and between line-to-ground (or neutral). Approximately 50 spikes per week occur on the power system. The amplitude and waveform of voltage spikes will vary depending on system parameters. It should be noted that over an equipment design life of 20 years, approximately 50,000 spikes of varying amplitude will be encountered. Equipment shall remain operational before, during, and after experiencing a voltage spike with the characteristics shown in Figure 6. Equipment shall not experience any operational interruption, suffer any loss of data, or require a system restart or reboot.