Electric Motor Control Basics - Book - Page 68
Applying Motor Control in a Wastewater Application
which are more demanding. It is necessary to know the voltage and horsepower of
the motor when selecting the proper NEMA motor starter. In the case where there is
a considerable amount of plugging and jogging involved, then derating a NEMA-rated
device will be required.
NEMA Contactor and Starter Sizes
NEMA Size
Continuous AMP Rating
HP at 230 VAC
HP at 460 VAC
00
9
1
2
0
18
3
5
1
27
5
10
2
45
15
25
3
90
30
50
4
135
50
100
5
270
100
200
6
540
200
400
7
810
300
600
8
1215
450
900
9
2250
800
1600
Industrial Control
Basics:
Part 1, Contactors
Industrial Control
Basics: Part 2,
Overload Relays
Industrial Control
Basics: Part 3,
Starters
The Benefits of Type E/F
Motor Protection
Circuit Breakers
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
Application
NEMA vs IEC Motor
Controls
Understanding
IP Ratings
68
