MIL-PRF-17773C(SH)
3.2.13 Terminal markings for supply lines and loads. Terminal markings for supply lines and loads shall be in
accordance with Table I. Like phases shall be arranged in the same manner. The phase rotation shall be A, B, C,
respectively, from right to left (facing the front), top to bottom, and front to back.
TABLE I. Terminal markings.
Sources and Load
AC
DC 2-Wire
DC 3-Wire
Two-way switches:
Normal (N) source
SA, SB, SC
S+, S-
S+, S±, S-
Emergency (E) source
EA, EB, EC
E+, E-
E+, E±, E-
Load
Ll, L2, L3
L+, L-
L+, L±, L-
Normal (N) source
S1A, S1B, S1C
S1+, S1-
S1+, S1±, S1-
Alternate (A) source
S2A, S2B, S2C
S2+, S2-
S2+, S2±, S2-
Load
Ll, L2, L3
L+, L-
L+, L±, L
Three-way switches:
Normal (N) source
S1A, S1B, S1C
S1+, S1-
S1+, S1±, S1-
Alternate (A) source
S2A, S2B, S2C
S2+, S2-
S2+, S2±, S2-
Emergency (E) source
EA, EB, EC
E+, E-
E+, E±, E-
Load
Ll, L2, L3
L+, L-
L+, L±, L-
3.2.14 Diagrams. Each switch shall include a wiring diagram and a schematic diagram. The information shall
be protected in accordance with Method 1 of MIL-E-2036 and shall be attached to the inside of the enclosure door in
accordance with MIL-E-2036. Wiring diagrams shall include wire numbers, component identification, and fuse size
and type, if applicable.
3.2.15 Instruction sheets. As specified (see 6.2), instruction sheets for installation shall be in accordance with
MIL-E-2036.
3.2.16 Configuration settings. When specified in 6.2, ABTs with adjustable settings shall include those settings
affixed in or on the ABT in accordance with MIL-DTL-15024 and MIL-P-15024/5.
3.2.17 Paint. Paint used on the switch shall be in accordance with the requirements of MIL-E-917 or MIL-
PRF-24712. Color shall be No. 26307 as specified by FED-STD-595.
3.3 Weight and size. Unless otherwise specified (see 6.2), the switch shall weigh not more than 300 pounds
and shall be not more than 40" H x 30" W x 20" D in size. 600 amp switches shall be no more than 56" H x 30" W x
20" D and no more than 300 pounds.
3.4 Performance characteristics.
3.4.1 Special features. When applicable, special features shall be as specified (see 6.2).
3.4.2 Modes of operation. Switches shall operate manually (MBT) or automatically (ABT). Automatic
transfer switches shall conform to the requirements of MIL-STD-1399-300. Automatic bus transfer switches shall
be capable of manual operation.
3.4.2.1 Automatic operation. The ABT shall monitor the power supplied from both the normal power source
and the alternate power source. A source shall be considered "available":
a.
When the source is within preset levels, or
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