Voltage Conversion - Honeywell AUTOMATIC CONTROL Engineering Manual

Full Minimum Size of
Copper Wire, AWG
Load
Current
75C
Rating of
60C RHW,
Motor
TW, THW,
Amperes
UF THWN
1 14 14
2 14 14
3 14 14
4 14 14
5 14 14
6 14 14
7 14 14
8 14 14
9 14 14
10 14 14
11 14 14
12 14 14
13 12 12
14 12 12
15 12 12
16 12 12
17 10 10
18 10 10
19 10 10
20 10 10
22 10 10
24 10 10
26 8 8
28 8 8
32 8 8
34 6 8
44 6 6
45 4 6
56 4 4
57 3 4
68 3 4
69 2 3
76 2 3
77 1 3
80 1 3
NOTES: 1. Single-phase all types with No Code letters.
All single-phase and polyphase squirrel-cage and synchronous motors with full voltage, resistor, or reactor starting,
no code letters or code letters F to V.
2. Squirrel-cage and synchronous motors:
With full voltage, resistor, or reactor starting, code letters b to e.
With autotransformer starting, not more than 30a with no code letters or more than 30a with code letters F to v.
High reactance squirrel-cage, not more than 30A, no code letters.
3. Squirrel-cage and synchronous motors with autotransformer starting more than 30A, no code letters. High
reactance squirrel-cage more than 30A, code letters B to E.
4. Squirrel-cage and synchronous motors with full voltage, resistor, or reactor starting or autotransformer starting with
more than 30A, code letter A. wound rotor, no code letter.

VOLTAGE CONVERSION

Existing Voltage
EMS Effective
Average
Peak
Peak-to-Peak
Table 26. Conductor Sizes and Overcurrent Protection for Motors.
Running
Maximum Allowable Rating or Setting (in Amperes) of Branch-Circuit,
Protection
of Motors.
Maximum
Setting of
Adjustable
90C
Protective
RHH,
Devices
THHN Fuses
14 1.25 15
14 2.50 15
14 3.75 15
14 5.0 15
14 6.25 15
14 7.50 20
14 8.75 25
14 10.00 25
14 11.25 30
14 12.50 30
14 13.75 35
14 15.00 40
12 16.25 40
12 17.50 45
12 18.75 45
12 20.00 50
10 21.25 60
10 22.50 60
10 23.75 60
10 25.00 60
10 27.50 70
10 30.00 80
8 32.50 80
8 35.00 90
8 40.00 100
8 42.50 110
8 55.00 150
6 56.25 150
6 70.00 175
6 71.25 175
4 85.00 225
4 86.25 225
4 95.00 250
3 96.25 250
3 100.00 250
Table 27. Voltage Conversion Multipliers.
EMS Effective
—
1.110
0.707
0.354
Short-Circuit, and Ground-Fault Protective Devices
Note 1 ß
Inverse Inverse
Time Time
Circuit Circuit
Breaker Fuses Breaker Fuses
15 15 15
15 15 15
15 15 15
15 15 15
15 15 15
15 15 15
20 20 15
20 20 20
25 25 20
25 25 20
30 30 25
30 30 25
35 35 30
35 35 30
40 40 30
40 40 35
45 45 35
45 45 40
50 50 40
50 50 40
60 60 45
60 60 50
70 70 60
70 70 60
80 80 70
90 90 70
110 110 90
125 125 90
150 150 125
150 150 125
175 175 150
175 175 150
200 200 175
200 200 175
200 200 175
Desired Voltage
Average
0.900
—
0.637
0.318
487 ENGINEERING MANUAL OF AUTOMATIC CONTROL
GENERAL ENGINEERING DATA
Note 3
Inverse
Time
Circuit
Breaker Fuses
15 15 15
15 15 15
15 15 15
15 15 15
15 15 15
15 15 15
15 15 15
20 20 15
20 20 15
20 20 15
25 25 20
25 25 20
30 30 20
30 30 25
30 30 25
35 35 25
35 35 30
40 40 30
40 40 30
40 40 30
45 45 35
50 50 40
60 60 40
60 60 45
70 70 50
70 70 60
90 90 70
90 90 70
125 125 90
125 125 90
150 150 110
150 150 110
175 175 125
175 175 125
175 175 125
Peak Peak-to-Peak
1.414 2.828
1.570 3.141
— 2.000
0.500 —
Note 4
Inverse
Time
Circuit
Breaker
15
15
15
15
15
15
15
15
15
15
20
20
20
25
25
25
30
30
30
30
35
40
40
45
50
60
70
70
90
90
110
110
125
125
125