Motor Disconnecting Means Quiz

<p>On the load side of the overcurrent protection and its disconnecting means</p> Signup and view all the answers

<p>It is used to open and isolate the electrical equipment from its power supply circuit.</p> Signup and view all the answers

<p>To simplify electrical lockout/tagout procedures.</p> Signup and view all the answers

<p>It verifies the proper operation of the safety system.</p> Signup and view all the answers

<p>To discourage tampering that could compromise the safe operation of the equipment.</p> Signup and view all the answers

<p>A general-use switch with an ampere rating not less than twice the full-load current rating of the motor</p> Signup and view all the answers

<p>A general-use switch</p> Signup and view all the answers

<p>An isolating switch</p> Signup and view all the answers

<p>A switch capable of interrupting the maximum overload current of a motor</p> Signup and view all the answers

<p>The equivalent horsepower of the combined loads</p> Signup and view all the answers

<p>The switch used shall be permitted to have a horsepower rating not less than the combined load of the motor(s)</p> Signup and view all the answers

<p>A line value</p> Signup and view all the answers

<p>General-use snap switch</p> Signup and view all the answers

<p>Isolating switch</p> Signup and view all the answers

<p>Not less than 115 percent of the full-load current rating of the motor</p> Signup and view all the answers

<p>Not less than 115 percent of the motor nameplate current</p> Signup and view all the answers

<p>Disconnecting means</p> Signup and view all the answers

<p>When the motor is associated with adjustable-speed drives</p> Signup and view all the answers

<p>In sight from the motor location and the driven machinery location</p> Signup and view all the answers

<p>When it introduces additional or increased hazards to persons or property</p> Signup and view all the answers

<p>available short-circuit current</p> Signup and view all the answers

<p>motors and motor controllers</p> Signup and view all the answers

<p>both the disconnecting means and the motor controllers are located in sight from the machine or apparatus</p> Signup and view all the answers

<p>All of the above</p> Signup and view all the answers

<p>1000 volts</p> Signup and view all the answers

<p>The disconnecting means should be part of the motor controller assembly</p> Signup and view all the answers

<p>115 percent of the motor controller's continuous current rating</p> Signup and view all the answers

<p>Not less than the ultimate trip setting of the overcurrent relays in the circuit</p> Signup and view all the answers

<p>Switch or circuit breaker</p> Signup and view all the answers

<p>A combination of a circuit breaker and fuses</p> Signup and view all the answers

<p>To disconnect all ungrounded conductors</p> Signup and view all the answers

<p>125 percent of the rated input current to the power conversion equipment</p> Signup and view all the answers

<p>8 m (6 ft)</p> Signup and view all the answers

<p>The input current rating of the power conversion equipment</p> Signup and view all the answers

<p>125 percent of the rated input current to the power conversion equipment</p> Signup and view all the answers

<p>The rated input current of the power conversion equipment</p> Signup and view all the answers

<p>Motor overload protection as described in Article 430, Part III</p> Signup and view all the answers

<p>Where a group of motors is in a separate room from the location of the disconnecting means</p> Signup and view all the answers

<p>Equal to the sum of the horsepower or current of each motor in the group</p> Signup and view all the answers

<p>When the motor is rated at more than 40 horsepower DC or 100 horsepower AC</p> Signup and view all the answers

<p>To provide a means of disconnecting the motor from the power source</p> Signup and view all the answers

<p>To provide isolation and protection for the remote-control circuit</p> Signup and view all the answers

<p>To ensure adequate air circulation over motor windings</p> Signup and view all the answers

<p>125% of the rated input current to the power conversion equipment</p> Signup and view all the answers

<p>The ampacity of the minimum conductor size marked on the power conversion equipment</p> Signup and view all the answers

<p>The rating and type of protection shall be determined by Table 430.52(C)(1) using the power conversion equipment's rated input current.</p> Signup and view all the answers

<p>115 percent of the rated input current of the conversion unit</p> Signup and view all the answers

<p>Type and rating or setting permitted for use with the power conversion equipment using the full-load current rating of the connected motor load</p> Signup and view all the answers

<p>Part XI adds to or amends the other provisions of the article.</p> Signup and view all the answers

<p>Where in a wet location and not isolated or guarded</p> Signup and view all the answers

<p>They should be guarded</p> Signup and view all the answers

<p>They should be connected to the equipment grounding conductor</p> Signup and view all the answers

<p>1.8 m (6 ft)</p> Signup and view all the answers

<p>Current rating of not less than 100 percent of the rated input current of the power conversion equipment</p> Signup and view all the answers

<p>Use of additional guarding for stationary motors with commutators, collectors, and brush rigging</p> Signup and view all the answers

<p>By installation in a room or enclosure that is accessible only to qualified persons</p> Signup and view all the answers

<p>The highest rated motor is determined by the motor with the highest rated-load current.</p> Signup and view all the answers

<p>The full-load current is determined by the motor horsepower rating selected from Table 430.248, Table 430.249, or Table 430.250.</p> Signup and view all the answers

<p>The highest rated motor is determined by the motor with the highest horsepower rating.</p> Signup and view all the answers

<p>The disconnecting means is located within sight of all the motor controllers.</p> Signup and view all the answers

<p>The word 'Motor'</p> Signup and view all the answers

<p>The switch must be rated for the voltage and current of the motor</p> Signup and view all the answers

<p>A non-fused switch or circuit breaker</p> Signup and view all the answers

<p>Thermal protection</p> Signup and view all the answers

<p>Maker's name, rating, and maximum short-circuit current</p> Signup and view all the answers

<p>To prevent unauthorized access to the equipment</p> Signup and view all the answers

<p>De-energized electrical equipment</p> Signup and view all the answers

<p>$y = mx + b$</p> Signup and view all the answers

<p>$A = lw$</p> Signup and view all the answers

<p>$x = \frac{-b \pm \sqrt{b^2-4ac}},{2a}$</p> Signup and view all the answers

<p>$V = \pi r^2h$</p> Signup and view all the answers

<p>$a^2 + b^2 = c^2$</p> Signup and view all the answers

<p>Multi-motor and combination-load equipment used in large commercial complexes</p> Signup and view all the answers

<p>Cord-and-attachment-plug-connected air-conditioning equipment</p> Signup and view all the answers

<p>To ensure compliance with the requirements of 110.9 and 110.10</p> Signup and view all the answers

<p>Rated-load current marked on the compressor nameplate</p> Signup and view all the answers

<p>Redundancy of the circuit overcurrent protective device in case of a line-to-ground fault</p> Signup and view all the answers

<p>900 mm horizontally and 2.5 m vertically</p> Signup and view all the answers

<p>$I_{sc} = rac{V}{Z}$</p> Signup and view all the answers

<p>The frames must be grounded using a grounding conductor sized according to Table 250.122(B)</p> Signup and view all the answers

<p>Selector switch</p> Signup and view all the answers

<p>If the motor is rated less than 100 horsepower ac or 40 horsepower dc</p> Signup and view all the answers

<p>It must be within sight from and readily accessible from the equipment</p> Signup and view all the answers

<p>The minimum circuit ampacity marked on the equipment</p> Signup and view all the answers

<p>Use Table 430.248, Table 430.249, and Table 430.250</p> Signup and view all the answers

<p>When the nameplate rated-load current is greater than the branch-circuit selection current</p> Signup and view all the answers

<p>125 percent of the motor-compressor rated-load current</p> Signup and view all the answers

<p>All of the above</p> Signup and view all the answers

<p>The sum of the required ampacity for the other load(s) and the motor-compressor load(s)</p> Signup and view all the answers

<p>The same as specified in Part VII of Article 440</p> Signup and view all the answers

<p>$I_{ ext{eq}} = I_{ ext{lr}} + I_{ ext{rated}} + I_{ ext{branch}}$</p> Signup and view all the answers

<p>$I_{ ext{lr}} = 6 imes I_{ ext{rated}}$</p> Signup and view all the answers

<p>115% of the sum of all currents at the rated-load condition</p> Signup and view all the answers

<p>Within sight and readily accessible from the equipment</p> Signup and view all the answers

<p>At least 115 percent of the nameplate rated-load current</p> Signup and view all the answers

<p>By adding the full-load current and locked-rotor current of each motor, including resistance loads</p> Signup and view all the answers

<p>From Table 430.248, Table 430.249, or Table 430.250, and also from Table 430.251(A) or Table 430.251(B)</p> Signup and view all the answers

<p>The next higher value obtained</p> Signup and view all the answers

<p>The rating or setting shall not exceed 175 percent of the motor-compressor rated-load current or branch-circuit selection current, whichever is greater.</p> Signup and view all the answers

<p>The highest rated motor shall be determined by the branch-circuit selection current.</p> Signup and view all the answers

<p>The disconnecting means should be marked with the short-circuit current rating.</p> Signup and view all the answers

<p>The purpose is to provide a means for disconnecting the power supply.</p> Signup and view all the answers