Question 1 of 10
What is the primary function of a motor disconnecting means?
The disconnecting means allows for the safe removal of power to the motor for maintenance or other purposes.
Question 2 of 10
According to the article, where should the motor disconnecting means be located?
The disconnecting means should be within sight of the motor and its controller for easy access.
Question 3 of 10
What is the minimum current rating of the disconnecting means for a single motor (rated 1000V or less) as a percentage of the motor's full-load current (FLC)?
The current rating of the disconnecting means for a single motor shall be at least 115% of the full-load current (FLC) of the motor circuit rated for 1,000V nominal or less.
Question 4 of 10
Which NEC table is NOT mentioned for sizing the disconnect?
The article references tables 430.247, 430.248, 430.249 and 430.250.
Question 5 of 10
If the disconnecting means is NOT within sight of a motor, and the motor is rated at 1000V or less, what is the maximum distance the second disconnecting means can be from the motor?
If the disconnecting means is not within sight of a motor rated at 1,000V or less, a second disconnecting means is required within 50 feet (15 m) and within sight of the motor, with a lockable feature.
Question 6 of 10
Which of the following is NOT listed as a type of disconnect that can be used for a motor?
Standard household light switches are not rated for motor loads or use as disconnects.
Question 7 of 10
For motors rated 2 HP or less and operating at 300V or less, which of the following can serve as a disconnect, provided certain conditions are met?
A general-use AC snap switch with an ampere rating of at least twice the motor's full-load current (FLC) can be used.
Question 8 of 10
What is the primary factor used for sizing motor branch circuit conductors, short-circuit protection, and overload protection?
Motor Full Load Current (FLC) is the primary factor for these sizing calculations.
Question 9 of 10
Which motor data is used to size the overload protection?
Motor Full Load Amperes (FLA) , as marked on the motor nameplate, is used for sizing the overload protection.
Question 10 of 10
If the rating of small motors is not covered by the relevant tables (430.247-430.250), what value should be used as the locked rotor current (LRC) approximation?
The locked rotor current (LRC) should be assumed to be six times the full-load current (FLC) of the motor.
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