MIL-DTL-2212K(SH)
TABLE VI. Hp rating for AC contactors and controllers - Continued. (see 6.2)
Ratings for nonreversing, nonjogging, reduced-voltage, polyphase magnetic
controllers for motors for part-winding starting (see 6.8.80)
Continuous rating
Size of controller
3-phase hp at 440 V
(amperes)
1
54
20
2
90
50
3
180
100
4
270
200
5
540
400
Ratings for multi-speed, magnetic controllers for nonplugging and nonjogging duty
for constant-horsepower motors
Continuous
3-phase hp at
Size of controller
rating
115 V
440 V
(amperes)
0
18
1
3
1
27
2
7½
2
45
---
20
3
90
---
40
4
135
---
75
5
270
---
150
6
540
---
300
7
810
---
450
3.16.16 Enclosures. Enclosures shall be in accordance with MIL-E-2036 and MIL-STD-108. The enclosure
shall be one of the following types as specified (see 6.2):
a.
Dripproof (45 degrees) (see 6.8.23)
b.
Watertight
c.
Submersible (15 feet)
d.
Explosion-proof (Class 1, Group D)
e.
Splashproof
3.16.16.1 Special provisions for fasteners penetrating the enclosure. Where screws or bolts that mount
components inside the enclosure penetrate the enclosure or door (dripproof), the following restrictions apply:
a.
Only the fastener head and, if applicable, washer may be visible from the front or sides of the enclosure.
b. Where fasteners penetrate the back of dripproof enclosures, the threaded portion may be exposed provided
the length of exposed fastener is kept to a minimum (preferably a maximum of four threads) and all materials are
treated and/or consist of corrosion-resisting material.
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