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MIL-M-17059A(SH1PS)
3.1.7.4 Short-time duty. - Motors rated for short-time duty shall carry rated load which, starting at
the ambient temperature, can be carried constantly for the period specified (see 6.1) without exceeding al-
lowable temperature rises (see table IX and 6.2.4).
.
3.1.8 Enclosure. - Enclosures shall conform to MIL-E-2036 and MIL-STD-108. Motors shall be of the
following enclosures, as specified (see 6.1). (For submarine applications, see 3.5.1.17.1.)
open
Watertight fan-cooled.
Totally enclosed.
Protected
Totally enclosed fan-cooled.
Dripproof.
Explosionproof.
Dripproof protected.
Explosionproof fan-cooled.
Spraytight
Submersible (15 foot).
Spraytight fan-cooled
Submersible (50 foot).
Watertight.
3.1.9 Standard horsepower sizes and speed ratings of induction motors. - The horsepower and speed
ratings for fractional horsepower, single-phase induction motors rated 115 volts shall be as specified in 6.1
and shall be furnished in accordance with table I.
Table I - Horsepower and speed ratings (induction motors).
All motors
except
Permanent-split
Shaded-
shaded
60-cycle
capacitor
pole
pole and
synchronous
motors
motors
permanent-split
r.p.m.
capacitor
Approximate full-load r.p.m.
3450
3000
3600
3000
1, 1.5, 2, 3, 5, 7.5, 10,
1725
1550
1800
1550
15, 25, and 35 milli-
1200
1140
1050
1050
horsepower
900
800
800
3600
3450
3000
3250
1/20, 1/12, and
1800
1725
1550
1625
1/8 horsepower
1200
1140
1050
1075
900
850
800
825
----
3600
3450
3250
----
1800
1725
1/6, 1/4, and
1625
----
1200
1140
1/3 horsepower
1075
----
900
850
825
----
3600
3450
3250
----
1/2 horsepower
1800
1725
1625
----
1200
1140
1075
----
3600
3/4 horsepower
3450
3250
----
1800
1725
1625
----
3600
3450
1 horsepower
3250
3.1.9.1 Universal motors. - Horsepower ratings shall be 10, 15, 25 and 35 millihorsepower and 1/20,
1/12, 1/8, 1/6, 1/4, 1/3, 1/2, 3/4 and 1 horsepower at a rated speed of 5,000 revolutions per minute
(r. p.m.) or above.
3.1.10 Speed variations. - The rated speed in r. p. m. or rated speed range in r.p.m. shall be as
specified (see 6.1). The speed shall be constant, multi, varying, or adjustable varying, as specified (see
6.1 and 6.2.5 through 6.2.8).
Permitted only when motor is to be located within a larger enclosure.
3

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