NEC Motor Sizing and Protection Quiz

What does the NEC mandate for sizing conductors supplying motors?

• 100% of the motor's full-load current

• 125% of the motor's full-load current

• 150% of the motor's full-load current

• 200% of the motor's full-load current

What is the purpose of overload protection according to the NEC?

• To increase motor speed

• To protect against high voltage

• To prevent overheating due to excessive current

• To enhance motor efficiency

What is required by the NEC to isolate the motor from the power source?

• A circuit breaker

• A disconnecting means

• A transformer

• A fuse

Where must the disconnect be located according to the NEC?

• In a separate room

• Within sight of the motor control equipment

• In a locked cabinet

• At the main power source

What is full-load current (FLC)?

• The current when the motor is off

• The current when the motor is initially started

• The current at rated horsepower and voltage

• The current during a short circuit

What is locked-rotor current (LRC)?

• The current when the motor is off

• The current when the motor is running at full speed

• The current when the motor is initially started

• The current during a short circuit

What should not be considered a substitute for professional electrical advice?

• The information provided on the internet

• A certified electrician

• A professional electrical service

• A licensed contractor

What do electrical training programs offer?

• Courses and training on the NEC and motor installations

• Free electrical tools

• Electrical safety gear

• Online shopping discounts

What should you do before performing any electrical work?

• Consult the latest edition of the NEC and a qualified electrician

• Watch a DIY video

• Ask a friend for help

• Read a general home improvement book

What is the primary purpose of grounding in electrical systems?

• To enhance the efficiency of electrical appliances

• To provide a path for electrical current to the earth

• To reduce the cost of electrical installations

• To increase the voltage of the system