The correct answer is: d) excessive heating due to motor overloads and failure to start You'll find the rules for motor and branch-circuit overload protection in Part III of Art. 430 in the 2011 NEC.

Group motor protection as described in NFPA 70, the U. S. National Electrical Code (NEC) Article 430.53 lets two or more motors be protected by the same overcurrent device as long as the installation ...

A good indication that a motor may be overloaded is overheating, or in some cases not starting at all. For HVAC motors it can be as simple as belts that may be too tight, inadequate wiring, or voltage ...

A recent development in UL standards can save you space, time, and money. Like most things, manual motor controllers and disconnect switches have their advantages and disadvantages. Unlike disconnect ...

Circuit protection has proven useful, but meeting the increasingly sophisticated industrial and commercial requirements can be a challenge. An overload or short circuit in a fuse or mini circuit ...

In troubleshooting situations involving a motor, more than half the battle is simply isolating the problem. Whenever there’s a working motor, there’s a load and there’s some sort of motor controller, ...

Enhancing motor-drive apps with added safety, the ACPL-785J isolation amplifiers include both short-circuit and overload detection and allow direct measurement of motor phase currents in power ...

The Allen-Bradley Branch motor control components have been revised by Rockwell Automation. According to the company, this move was made to update systems where components are used to turn on and off ...

Overloading electrical circuits is easier than you may think, especially around the holidays. At best, overloading the circuit is inconvenient, but it can also be dangerous. So, if you see the warning ...

San Jose, Calif.—Avago Technologies announced a new series of competitively priced isolation amplifiers with short circuit and overload detection. Based on optical insulation technology and ...