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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64

MIL-STD-1399-3008

Type lll

115 Vac

Type ll

115 Vac

Type lll

440 Vac

Type ll

440 Vac

1 10 100 1000

lnput Power (kW) Rating of User Equipment

FIGURE 22. Surge current limits for load equipment using Type II or III power.

5.2.11 Insulation resistance. When un-energized, user equipment shall tolerate the application of 500 VDC by a megohmmeter insulation resistance tester between each power conductor and ground without equipment damage, arc-over, degradation, or abnormal operation. NSTM Chapter 300 procedures may be used as a guide. The resistance to ground value as measured by the megohmmeter shall be equal to or greater than 10 Mohms as identified in MIL-E-917.