MIL-DTL-17060G(SH)
3.5.1.23.2 Securing stator core to frame. Means shall be provided to prevent rotation of the core in the frame
and axial displacement of the core along the frame.
3.5.1.24 Terminal boxes and terminal box covers. Terminal boxes and covers shall be provided and securely
bolted or welded to the frame. Use of pipe nipples where they are necessary or where motors are to be used in
inaccessible locations shall be as approved (see 6.11). Terminal boxes shall be provided with conduit openings as
specified (see table I; for submarine applications see 3.5.2.5.4). For multispeed motors with multiple independent
windings, one conduit opening of the size indicated in table I shall be provided for each hp rating. For motors rated
over 250 hp, the conduit openings shall be sized to suit the number and diameter of ship cables specified (see 6.2).
TABLE I. National pipe thread (NPT) assignments for motor terminal boxes nylon tubes. 1/
Maximum full-load amps
NPT
Tube size
hp
18
¾
2
1, 2, 3, 5, and 7½
25
1
3
10, 15, 10, 25, and 30
110
1½
5
40, 50, 60, and 75
185
2
6
100 and 125
250
2½
7
150
320
3
8
200
400
3½
9
--
NOTE:
1/
NPT sizes are based on the maximum expected three-conductor cable size. If cable size permits,
the hole size may be reduced to the next lower size by use of a reducing bushing which will be
inserted by the installing activity. If steel tubes are used, the installing activity shall provide the
proper size reducing bushing to fit.
3.5.1.25 Connections and terminals.
3.5.1.25.1 Securing connections. Connections (mechanical and electrical) shall be provided with locking
devices in accordance with MIL-E-917. Connections and leads shall be secured to prevent their coming in contact
with moving parts or being chafed by contact with stationary parts. Excess solder shall be removed from soldered
connections.
3.5.1.25.2 Field connections. In general and where practicable, field connections shall be made on the front
end (see 6.6.8). In split-frame motors, the field connections which will be broken for disassembly shall be readily
accessible.
3.5.1.25.3 Securing terminal leads. The leads shall be secured by a lead clamp or by anchoring them to the
motor windings so that no strain is put on the end connections. Where a lead clamp is provided, it shall be attached
to the frame and not to the end shields.
3.5.1.25.4 Cable connectors. The end of each motor lead shall be fitted with a connector for joining the motor
lead to the supply circuit cable or wire. Ship service cables and their terminal lugs shall not be supplied by the
motor manufacturer.
3.5.1.25.5 Flexible leads. Terminal leads shall be made of flexible, stranded insulated wire. Means to prevent
abrasion of the lead insulation by metallic edges of the motor frame, terminal box, piping, or cable clamp shall be
provided.
3.5.1.26 Lead wire identification. Lead wires shall be permanently marked in accordance with MIL-E-917.
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