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Large Single Phase Motors

 

 

 

 

Installation Guidelines

How to Determine Converter, Wire, & Breaker Size:

Largest Motor to

Start Load

Total Motor HP Load

Single Phase Supply Breaker

Single Phase Wire Size AWG

Rotary Converter Needed

Light

Medium

Heavy

1

.75

.5

2

15

14

1 HP

2

1.5

1

4

20

12

2 HP

3

2

1.5

6

20

12

3 HP

5

3

2

10

30

10

5 HP

7.5

5

3

15

40

8

7.5 HP

10

7.5

5

20

60

6

10 HP

15

10

7.5

30

80

4

15 HP

20

15

10

45

100

3

20 HP

25

20

15

50

150

1

25 HP

Installation Notes

  • Installation should be done by a qualified electrician
  • If using fuses, use only dual element time delay fuses
  • Do not connect control circuits to manufactured leg 3
  • The wire sized shown are for copper conductors
  • The diagram below does not supersede any requirements of national, state or local codes
  • Always start the converter before applying the load
  • Properly ground all electrical equipment


 

 

 

 

 

 

 

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