MIL-DTL-17060G(SH)
3.5.1.8 Enclosures. Enclosures shall be in accordance with Class 2 of MIL-E-2036. For submarine
applications, see 3.5.2.5.1. For degrees of enclosure greater than totally enclosed, except for explosionproof, also
requirements of MIL-E-2036 for enclosures TE, SPT, and EXP, respectively. Unless otherwise indicated in the duty
cycle (see 3.5.1.6), submersible motors (see 6.6.7.2) shall operate continuously in air. Submersible motors that
operate continuously in air may have a frame size in accordance with the provisions for totally enclosed (TE) motors
(see figures 1 through 4). Enclosures shall be one of the following types as specified (see 6.2 and 6.6.7):
Dripproof protected - DPP
Spraytight - SPT 1/
Spraytight fan-cooled - SPTFC 1/
Spraytight air-over - SPTAO 1/
Watertight - WT 2/
Totally enclosed air-over - TEAO
Totally enclosed - TE
Totally enclosed fan cooled - TEFC
Explosionproof air-over, group D - EXPAO
Explosionproof, group D - EXP
Explosionproof, fan cooled, group D - EXPFC
Submersible (3 ft) - SUB3 3/
Submersible (15 ft) - SUB15 3/
Submersible (50 ft) - SUB50 3/
NOTES:
1/
Shaft leakage shall be prevented without the use of shaft rubbing seals. Slingers shall be non-corrodible
and non-sparking. The fit between slinger and shaft shall prevent leakage along the shaft without fillers
(see MIL-E-2036).
2/
The enclosure shall have as a minimum a single-faced, continuously lubricated, non-corrodible, shaft seal
without shaft rubbing element.
3/
The enclosure shall have as a minimum a double-faced, continuously lubricated, non-corrodible, shaft seal
without shaft rubbing element.
3.5.1.9 Speed. The rated speed in revolutions per minute (r/min) or rated speed range in r/min shall be as
specified (see 6.2). The speed shall be constant (see 6.6.25.1), multi (see 6.6.25.2), adjustable (see 6.6.25.3),
varying (see 6.6.25.4), or adjustable varying (see 6.6.25.5) as specified (see 6.6.4 through 6.6.25.5).
3.5.1.10 Standard horsepower (hp) ratings. Motors shall be furnished in the following standard hp ratings, as
specified (see 6.2):
½
2
10
30
75
200
400
¾
3
15
40
100
250
450
1
5
20
50
125
300
500
1½
7½
25
60
150
350
and above
3.5.1.11 Design and types. Motors shall be of the following types and designs, as specified (see 6.2 and 6.6.26
through 6.6.27).
Squirrel-cage induction (see 6.6.26):
a.
(1) Design A (see 6.6.26.1)
8
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