Electric Motor Control Basics - Book - Page 46
The Benefits of Type E/Type F
Motor Protection Circuit Breakers
Motor Control Configuration Challenges
Designing motor-driven electrical equipment and panels can be a labor-intensive
process due to installation requirements mandated by NFPA 70 National Electric
Code (NEC) Article 430: Motors, Motor Circuits, and Controllers, which defines the
requirements for all motor branch circuits and the operational functionality of panel
devices to include:
• Motor disconnecting means – disconnect switch, molded case switch or molded
case circuit breakers
• Motor branch-circuit, short-circuit, and ground fault protection – molded case
circuit breaker or fuses
• Motor controller – contactor
• Motor overload protection – thermal overload relay
Electrical control products must be able to be used globally in addition to being
compliant with NEC codes and standards. To ensure compliance with NEC codes, third
party certifications (such as Underwriters Laboratories) and international standards,
controls engineers often times would size and install individual single function devices
that would meet all industry specifications.
These efforts resulted in panels being packed with multiple controls with each
individual device requiring proper sizing and spacing to fit within the panel — resulting
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
46
