Copyright 2046 National Fire Protection Association (NFPA). Licensed, by agreement, for individual use and download on 70/18/2015 to VoltServerfor designated user Stephen Eaves. No other reproduction or transmission in any
`form permitted without written permission of NFPA, Farinquiries or to report unauthorized use, contact licensing@nfpa.org.
`
`ARTICLE 430 — MOTORS, MOTORCIRCUITS, AND CONTROLLERS
`
`430.75
`
`(lL) Separate Overcurrent Protection, Where the motor
`branch-circuit short-circuit and ground-fault protective device
`does not provide protection in accordance with 430.72(B) (2),
`separate overcurrent protection shall be provided. The over-
`current protection shall not exceed the values specified in
`Column A of Table 430.72(B).
`
`(2) Branch-Circnit Overcurrent Protective Device. Conduc-
`tors shall be permitted to be protected by the motor branch-
`circuit short-circuit and ground-fault protective device and
`shall require only short-circuit and ground-fault protection.
`Where the conductors do not extend beyond the motor
`control equipment enclosure,
`the rating of the protective
`device(s) shall not exceed the value specified in Column B of
`Table 430.72(B). Where the conductors extend beyond the
`motor control equipment enclosure, the rating of the protec-
`tive device(s) shall not exceed the value specified in Column G
`of Table 430.72({B).
`
`(C} Control Circuit Transformer. Where a motor control
`circuit transformeris provided, the transformer shall be protec-
`ted in accordance with 430.72(C) (13, (C)¢2), (C)(3), (C) (4),
`or (C){5).
`
`Exception: Overcurrent protection shall be omitted where the opening of
`the control circuit would create a hazard as, for example,
`the controt
`circuit ofa fire pump motor and thelike,
`
`{1) Compliance with Article 725. Where the transformer
`supplies a Class | powerlimited circuit, Class 2, or Class 3
`remote-control circuit complying with the requirements of Arti-
`cle 725, protection shall comply with Article 725.
`
`(2) Compliance with Article 450. Protection shall be permit-
`ted to be provided in accordance with 450.3.
`
`(3) Less Than 56 Volt-Amperes. Control circuit transformers
`rated less than 50 volt-amperes (VA) and that are an integral
`part of the motor controler and located within the motor
`controller enclosure shall be permitted to be protected by
`primary overcurrent devices,
`impedance limiting means, or
`other inherent protective means.
`
`(4) Primary Less Than 2 Amperes. Where the control circuit
`transformer rated primary current is less than 2 amperes, an
`
`overcurrent device rated orset at not more than 500 percent of
`the rated primary current shall be permitted in the primary
`circuit.
`
`(5) Other Means. Protection shall be permitted to be provi-
`ded by other approved means.
`
`from Physical Damage.
`430.73 Protection of Conductors
`Where damage to a motor contro] circuit would constitute a
`hazard, ali conductors of such a remote motor control circuit
`that are outside the control deviceitself shall be instailed in a
`
`raceway or be otherwise protected from physical damage.
`
`430.74 Electrical Arrangement of Gontrol Circuits. Where
`one conductor of the motor control circuit is grounded, the
`motor control circuit shall be arranged so that a ground fault
`in the control circuit remote from the motor controller will
`
`(1) not start the motor and (2) not bypass manually operated
`shutdown devices or automatic safety shutdown devices.
`430.75 Disconnection.
`
`(A) General. Motor control circuits shall be arranged so that
`they will be disconnected from all sources of supply when the
`disconnecting means is in the open position. The disconnect:
`ing meansshail be permitted to consist of two or more separate
`devices, one of which disconnects the motor and the controller
`from the source(s) of power supply for the motor, and the
`other(s}, the motor contro! circuit(s) from its power supply.
`Whereseparate devices are used, they shall be located immedi-
`ately adjacent to each other.
`
`Exception. No. 1: Where more than 12 motor control circuit conductors
`are required to be disconnected, the disconnecting means shall be permit.
`ted to be located other than immediately adjacent to each other where all
`of thefollowing conditions are complied with:
`(a} Access te energized parts is limited to qualified persons in
`accordance with Part XH of this article.
`(i) A warning signis permanently located on the outside of eack
`equipment enclosure door or cover permitting access to the live parts in
`the motor control circuii(s), warning that motor confrol circuit discon-
`necting means are remotely located and specifying the location and
`identification of each disconnect. Where energized parts are not in an
`equipment enclosure as permitted by 430.232 and 430.233, an addi-
`
`‘Table 430.72(B) Maximum Rating of Overcurrent Protective Device in Amperes
`
`Control Circuit
`
`Column A Separate Protection
`Provided
`Aluminum or
`
`
`Protection Provided by Motor Branch-Circuit Protective Device(s)
`Colum B
`Conductors Within
`Enclosure
`Aluminum or
`
`Column C Conductors Extend Beyond
`Enclosure
`Aluminum or
`
`Conductor Size
`Copper-Clad
`Copper-Clad
`Copper-Clad
`
`(AWG)
`Copper
`Aluminum
`Copper
`Aluminum
`Copper
`Aluminum
`18
`7
`—
`25
`—_
`7
`noe
`16
`10
`—
`40
`—
`10
`—
`14
`(Note 1}
`_
`166
`—
`45
`—
`12
`(Note 1}
`(Note 1}
`120
`106
`60
`45
`10
`(Note 1}
`(Note 1}
`166
`140
`90
`75
`Larger than 19
`(Note 1}
`(Note 1}
`(Note 2)
`(Note 2)
`(Note 3)
`(Note 3)
`Notes:
`1. Value specified in 310.15 as applicable,
`2, 400 percent of value specified in Table 310.15(B) (17) for 66°C conductors.
`3. 300 percent of value specified in Table 310.15(B) (16) for 66°C conductors.
`
`Page 314 of 881
`
`VOLTSERVER EXHIBIT 1019 (part 2 of 3)
`
`

`

`Copyright 2016 National Fire Profection Association (NFPA). Licensed, by agreement, for individual use end download on 10/18/2016 te VoltGerver for designated user Stephen Eaves. No other reproduction or transmission in any
`form permilted without written permission af NFPA. For inquiries of fo repart unauthorized use, contact licensing@nfoa.arg.
`
`ARTICLE 430 — MOTORS, MOTOR CIRCUITS, AND CONTROLLERS
`
`tional warning sign{s) shall be located where visible to persons who may
`be working in the avea of the energized parts.
`
`Exception No. 2: The motor control circuit disconnecting means shall be
`permitted to be remotefrom the motor controller power supply disconnect-
`ing means where the opening of one or more motor control circuit
`disconnecting means is capable of resulting in potentially unsafe condi-
`fionsfor personnel or property and the conditions of items (a) and (b) of
`Exception No. I are complied with,
`(B) Control Transformer in Controller Enclosure. Where a
`transformer or other device is used to obtain a reduced voltage
`for the motor control circuit and is located m the controller
`enclosure, such transformer or other device shall be connected
`to the load side of the disconnecting means for the motor
`control circuit.
`
`Part Vil. Motor Controllers
`
`Part VII
`430.81 General.
`controllers for all motors.
`
`is
`
`intended to require suitable
`
`(A) Stationary Motor of 4 Horsepower or Less. For a station-
`ary motor rated at % hp or less that is normally left running
`and is constructed so that it cannot be damaged by overload or
`failure to start, such as clock motors and the like, the branch-
`circuit disconnecting means shall be permitted to serve as the
`controller.
`
`(B) Portable Motor of '4 Horsepower or Less. For a portable
`motor rated at 4 hp orless, the controller shall be permitted to
`be an attachment plug and receptacle or cord connector.
`
`430.82 Controller Design.
`
`[ach controller shall be capable of
`(A) Starting and Stopping.
`starting and stopping the motorit controls and shall be capable
`of interrupting the locked-rotor current of the motor.
` shali
`(B) Autotransformer.
`An
`autotransformer
`starter
`provide an “off” position, a running position, and at least one
`starting position. It shall be designed so that it cannot rest in
`the starting position or in any position that will render the
`overload device in the circuit inoperative.
`
`(G) Rheosiats. Rheostats shall be in compliance with the
`following:
`(1) Motorstarting rheostats shall be designed so that the
`contact arm cannot be left on intermediate segments.
`The point or plate on which the arm rests when in the
`starting position shall have no electrical connection with
`the resistor.
`(2) Motorstarting rheostats for dc motors operated from a
`constant voltage supply shall be equipped with automatic
`devices that will interrupt the supply before the speed of
`the motor has fallen to less than one-third its normalrate.
`
`430.83 Ratings. The controller shall have a rating as specified
`in 430.83(A), unless otherwise permitted in 430.83(B) or (C),
`or as specified in (D), under the conditions specified.
`(A) General.
`
`(1) Horsepower Ratings. Controllers, other than inverse time
`circuit breakers and molded case switches, shall have horse-
`power ratings at the application voltage not lower than the
`horsepower rating of the motor.
`
`inverse time circuit
`(2) Circuit Breaker. A branch-circuit
`breaker rated in amperes shall be permitted as a controller for
`all motors. Where this circuit breaker is also used for overload
`protection, it shall conform to the appropriate provisions of
`this article governing overload protection.
`
`(3) Molded Case Switch. A molded case switch rated in
`amperesshall be permitted as a controller for all motors.
`
`(B) Small Motors. Devices as specified in 430.81{A) and (B)
`shall be permitted as a controller,
`
`(C) Stationary Motors of 2 Horsepower or Less. For station-
`ary motors rated at 2 hp or less and 300 volts or less,
`the
`controller shall be permitted to be either of the following:
`(1) A general-use switch having an ampere rating not less
`than twice the fullioad currentrating of the motor
`(2) On ac circuits, a generaluse snap switch suitable only for
`use on ac {not generaluse ac-de snap switches) where
`the motor full-load current rating is not more than
`80 percent of the ampererating of the switch
`
`(D) Torque Moters. For torque motors, the controller shall
`have a continuous-duty, fullload current rating not less than
`the nameplate current rating of the motor For a motor
`controller rated in horsepower but not marked with the forego-
`ing current rating, the equivalent current rating shall be deter-
`mined from the horsepower rating by using Table 430,247,
`Table 430.248, Table 430.249, or Table 430.250.
`
`(E) Voltage Rating. A controller with a straight voltage rating,
`for example, 240 volts or 480 volts, shall be permitted to be
`applied in a circuit in which the nominal voltage between any
`two conductors does not exceed the controller’s voltage rating.
`A controller with a slash rating, for example, 120/240 volts or
`480Y/277 volts, shall only be applied in a solidly grounded
`circuit
`in which the nominal voltage to ground from any
`conductor does not exceed the lower of the two values of the
`controller’s voltage rating and the nominal voltage between
`any two conductors does not exceed the higher value of the
`controller’s voltage rating.
`
`430.84 Need Net Open All Conductors. The controller shall
`not be required to open all conductors to the motor.
`
`Exception: Where the controller serves also as a disconnecting means, tt
`shall open ail ungrounded conductors to the motor as provided im
`430,111,
`
`430.85 In Grounded Conductors. One pole of the controller
`shall be permitted to be placed in a permanently grounded
`conductor, provided the controller is designed so that the pole
`in the grounded conductor cannot be opened without simuita-
`neously opening all conductors of the circuit.
`
`430.87 Number of Motors Served by Each Controller. Each
`motor shall be provided with an individual controller.
`
`Exception No. 1: For motors rated 10G0 volts orless, a single controller
`rated at not
`less than the equivalent hersepower, as determined in
`accordance with 430. 110{(C)(1), of all the motors in the group shall be
`permitted to serve the group under anyof thefollawing conditions:
`(a} Where a number of motors drive several parts of a single
`machine or prece of apparatus,
`such as metal and woodworking
`machines, cranes, hoists, and similar apparatus
`(6) Where a group of motors is under the protection of one over-
`current device as permitted in. 430,53(A)
`
`Page 315 of 881
`
`

`

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`form permitted without written permission af NFPA, For inquities or to report unauthorized use, contactlicensing@infpa.org
`
`ARTICLE 480 — MOTORS, MOTOR CIRCUITS, AND CONTROLLERS
`
`450.99
`
`(c) Where a group of moiors is located in a single room within
`sightfrom the controller location
`
`connecting the grounded conductor, onits supply side, to the
`motor control center equipment ground bus,
`
`Exception No. 2: A branch-circuit disconnecting means serving as the
`controller as allowed in 436.81(A) shall he permitted to serve more than
`one motor
`
`Exception: High-impedance grounded neutral systems shall be permitted
`to be connected as provided in 250.36,
`
`430.88 AdjustableSpeed Motors. Adjustable-speed motors
`that are controlled by meansoffield regulation shall be equip-
`ped and connected so that they cannot be started under a
`weakened field.
`
`Exception: Starting under a weakened field shall be permitted where the
`motoris designedfor such starting.
`
`430.89 Speed Limitation. Machines of the following types
`shall be provided with speed-limiting devices or other speed-
`limiting means:
`:
`Separately excited dc motors
`Series motors
`(3) Motor-generators and converters that can be driven at
`excessive speed from the de end, as by a reversal of
`current or decrease in load
`
`Exception: Separate speed-limiting devices or means shail not be
`required undereither of thefollowing conditions:
`the system, or
`(1) Where the inherent characieristics of the machines,
`the load and the mechanical connection thereto are such as to
`safely limit the speed
`(2) Where the machine is always under the manual control of a
`qualified operator
`430.90 Combination Fuseholder and Switch as Controller.
`The rating of a combination fuseholder and switch used as a
`motor controller shall be such that the fusehoider will accom-
`modate the size of the fuse specified in Part II of this article
`for motor overload protection.
`
`Exception: Where fuses having time delay appropriate for the starting
`characteristics of the motor ave used, fusehoiders of smaller size than
`specified in Part IH ofthis article shall be permitted.
`
`Part Vill. Moter Control Centers
`
`450.92 General. Part VHI covers motor control centers instal-
`led for the control of motors, lighting, and powercircuits.
`430.94 Overcurrent Protection. Motor control centers shall
`be provided with overcurrent protection in accordance with
`Parts I, If, and VHI of Article 240, The ampere rating or setting
`of the overcurrent protective device shall not exceed the rating
`of the common powerbus. This protection shall be provided by
`(1) an overcurrent protective device located ahead of the
`motor control center or (2) a main overcurrent protective
`device located within the motor contro! center.
`
`430,95 Service Equipment. Where used as service equipment,
`each motor control center shall be provided with a single main
`disconnecting means to disconnect ali ungrounded service
`conductors.
`
`Exception: A second service disconnect shall be permitted to supply
`additional equipment.
`
`Wherea grounded conductor is provided, the motor control
`center shall be provided with a main bonding jumper,sized in
`accordance with 250.28(D), within one of the sections for
`
`430.96 Grounding. Multisection motor control centers shail
`be connected together with an equipment grounding conduc-
`tor or an equivalent equipment grounding bus sized in accord-
`ance with Table 250.122. Equipment grounding conductors
`shall be connected to this equipment grounding bus or to a
`grounding termination point provided im a single-section
`motor control center.
`
`450.97 Busbars and Conductors.
`
`(A) Support and Arrangement. Busbars shali be protected
`from physical damage and be held firmly in place. Other than
`for required interconnections and control wiring, only those
`conductors that are intended for termination in a vertical
`section shall be located in that section.
`
`Exception: Conductors shall be permitted to travel horizontally through
`vertical sections where such conductors are isolated from the busbars by
`a barrier.
`
`(B) Phase Arrangement. The phase arrangement on 3-phase
`horizontal common power and vertical buses shall be A, B, G
`from front to back, top to bottom, or left to right, as viewed
`from the front of the motor control center. The B phase shall
`be that phase having the higher voltage to ground on 3-phase,
`4wire, delta-connected systems. Other busbar arrangements
`shall be permitted for additions to existing installations and
`shall be marked.
`
`is
`Exception: Rearmounied units connected to a vertical bus that
`common to front-mounted units shall be permitted io have a C, B, A
`phase arrangement where properly identified.
`
`(C} Minimum Wire-Bending Space. The minimum wire-
`bending space at the motor control center terminals and mini-
`mum gutter space shall be as required in Article 312(D).
`
`Spacings between motor control center bus
`{D) Spacings.
`terminals and other bare metal parts shall not be less than
`specified in Table 430.97(D).
`
`(E) Barriers. Barriers shall be placed in all service-entrance
`motor control centers to isolate service busbars and terminals
`from the remainder of the motor control center.
`
`430.98 Marking.
`(A) Motor Control Centers. Motor control centers shall be
`marked according to 110.21, and the marking shall be plainly
`visible after installation. Marking shali also include common
`power bus current rating and motor control center short-
`cirenit rating.
`
`(B) Motor Contrel Units. Motor control units in a motor
`control center shali comply with 430.8.
`N 430.99 Available Fault Current. The available short circuit
`eurrent at the motor control center and the date the short
`circuit current calculation was performed shali be documented
`and made available to those authorized to inspect the installa-
`tion.
`
`Page 316 of 881
`
`

`

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`form permitted without written permission of NFPA, For inquiries or io report unauthorized use, contact ficensing@nfpa.arg.
`
`ARTICLE 430 — MOTORS, MOTOR CIRCUITS, AND CONTROLLERS
`
`Table 430.97(D) Minimum Spacing Between Bare Metal Parts
`
`
`Opposite Polarity Where Held
`Opposite Polarity Where Mounted
`
`on the Same Surface
`Free in Air
`Live Parts to Ground
`
`Nominal Voltage
`mm
`in,
`mm
`in.
`mm
`in.
`Not over 125 volts, nominal
`19.1
`x,
`12.7
`%
`12.7
`y%
`Notover 250 volts, nominal
`31.8
`1%
`19.1
`A
`12.7
`ye
`Not over 600 volts, nominal
`50.8
`2
`25.4
`1
`25,4
`1
`
`Part IX. Disconnecting Means
`
`430.101 General. Part IX is intended to require disconnect-
`ing means capable of disconnecting motors and controllers
`from the circuit.
`
`Informational Note: Some examples of increased or additional
`hazards include, but are not limited to, motors rated in excess of
`100 hp, multimetor equipment, submersible motors, motors
`associated with adjustable speed drives, and motors located in
`hazardous (classified) locations.
`
`430.102 Location.
`
`(A) Controller. An individual disconnecting means shall be
`provided for each controller and shal! disconnect the control
`ler. The disconnecting means shall be located in sight from the
`controller location.
`
`Exception No. 1: For motorcircuits over 1000 valts, nominal, a control
`ler disconnecting means lockable in accordance with 110.25 shall be
`permitted to be out of sight of the controller, provided that the controller
`is marked with a warning label giving the location of the disconnecting
`
`Exception No. 2: A single disconnecting means shall be permitted for a
`group of coordinated controllers that drive several parts of a single
`machine or plece of apparatus. The disconnecting means shall be loca-
`ied in sight from the controllers, and both ihe disconnecting means and
`the controllers shall be located in sight from ihe machine or apparatus.
`
`Exception No. 3: The disconnecting means shall not be requared to be in
`sight from valve actuator motor (VAM) assemblies containing the
`controller where such a location introduces additional or increased
`hazards to persons or property and conditions (a) and (b} are met.
`The vatve actuator motor assembly is marked with a warn-
`ing label giving the location of the disconnecting means.
`The disconnecting means is lochable in accordance with
`
`In industrial installations, with written safety procedures,
`{b}
`where conditions of maintenance and supervision ensure that only
`qualified persons service ihe equipment
`Informational Note: For information on lockout/tagout proce-
`dures, see NFPA 70H-2015, Standardfor Electricat Safety in the Work-
`place.
`
`430,103 Operation. The disconnecting means shall open ali
`ungrounded supply conductors and shall be designed so that
`no pole can be operated independently. The disconnecting
`means shall be permitted in the same enclosure with the
`controiler, The disconnecting means shall be designed so that
`it cannot be closed automaticaily.
`Informational Note: See 430.113 for equipment
`energy from more than one source.
`
`receiving
`
`430.104 To Be Indicating. The disconnecting means shall
`plainly indicate whetherit is in the open (off) or closed (on)
`position.
`
`430.105 Grounded Conductors. One pole of the disconnect
`ing means shall be permitted to disconnect a permanently
`grounded conductor, provided the disconnecting means is
`designed so that the pole in the grounded conductor cannot
`be opened without simultaneously disconnecting all conduc-
`tors of the circuit.
`
`(B) Motor. A disconnecting means shall be provided for a
`motor in accordance with (B}(1) or (B){2).
`
`430.107 Readily Accessible. At least one of the disconnecting
`means shall be readily accessible.
`
`(1) Separate Motor Disconnect. A disconnecting means for
`the motorshall be located in sight from the motor location and
`the driven machinery location,
`
`The controller disconnecting
`(2) Contreller Disconnect.
`means required in accordance with 430.102(A) shall be permit-
`ted to serve as the disconnecting means for the motorif it is in
`sight from the motor location and the driven. machinery loca-
`
`Exception to (1) and (2): The disconnecting means for the motorshall
`not be required under either condition (a} or condition {b), which
`follow, provided that the controller disconnecting means required in
`430. 102A)is lockable in accordance with 110.25.
`{a} Where such a location of the disconnecting means for the
`motor is impracticable or introduces additional or increased hazards to
`persons or property
`
`Every disconnecting
`430.108 Every Disconnecting Means.
`means in the motor circuit between the point of attachment to
`the feeder or branch circuit and the point of connection to the
`moter shail comply with the requirements of 430.109 and
`430.1106.
`
`430.109 Type. The disconnecting means shall be a type speci-
`fied in 430.109(A), unless otherwise permitted in 430.109(B}
`through (G), under the conditions specified.
`
`(A) General.
`
`(1) Motor Circuit Switch.
`horsepower.
`(2} Molded Case Circuit Breaker. A listed moided case circuit
`breaker,
`
`<A listed motorcircuit switch rated in
`
`(3} Molded Case Switch. A listed molded case switch.
`
`Page 317 of 881
`
`

`

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`form permitted without written permission of NFPA. For inquiries or to report unauthorized use, contact licensing@alba org.
`
`ARTICLE 430 — MOTORS, MOTOR CIRCUITS, AND CONTROLLERS
`
`430.110
`
`(4) Instantaneous Trip Circuit Breaker. An instantaneous trip
`circuit breaker that is part of a listed combination motor
`controller.
`
`self
`
`Listed
`
`(5) Self&Protected Combination Controller.
`protected combination controller,
`(6) Manual Moter Controller. Listed manual motor control-
`lers additionally marked “Suitable as Motor Disconnect” shall
`be permitted as a disconnecting means where installed between
`the final motor branch-circuit short-circuit protective device
`and the motor. Listed manual motor controllers additionally
`marked“Suitable as Motor Disconnect” shall be permitted as
`disconnecting means on theline side of the fuses permitted in
`430.52(C) (5). In this case, the fuses permitted in 430.52(C) (5)
`shall be considered supplementary fuses, and suitable branch-
`circuit short-circuit and ground-fault protective devices shall be
`installed on the line side of the manual motor controller addi-
`tionally marked “Suitable as Motor Disconnect.”
`
`(7) System Isolation Equipment. System isolation equipment
`shall be listed for disconnection purposes. System isclation
`equipment shali be installed on the load side of the overcur-
`rent protection and its disconnecting means. The disconnect
`ing meansshall be one of the types permitted by 430.109(A) (1)
`through (A) {3}.
`
`(B) Stationary Motors of 4 Horsepower or Less. Forstation-
`ary motors of 4% hp or less,
`the branch-circuit overcurrent
`device shall be permitted to serve as the disconnecting means.
`
`(C) Stationary Motors of 2 Horsepower or Less. For station-
`ary motors rated at 2 hp or less and 300 volts or less, the discon-
`necting means shall be permitted to be one of the devices
`specified in (1), (2), or (3):
`(1) A general-use switch having an ampere rating not less
`than twice the fulldoad current rating of the motor
`(2) On ac circuits, a general-ause snap switch suitable only for
`use on ac (not generabuse ac-dc snap switches) where
`the motor full-load current rating is not more than
`80 percent of the ampererating of the switch
`(3} A fisted manual motor controller haying a horsepower
`rating not less than the rating of the motor and marked
`“Suitable as Motor Disconnect”
`
`(DB) Autotransformer-Type Controlled Motors. For motors of
`over 2 hp to and including 100 hp, the separate disconnecting
`means required for a motor with an autotransformertype
`controller shall be permitted to be a general-use switch where
`all of the following provisions are met:
`(1) The motor drives a generator that is provided with over-
`load protection.
`(2) The controller is capable of interrupting the locked-rotor
`current of the motors,
`is provided with a no voltage
`release, and is provided with running overload protection
`not exceeding 125 percent of the motor full-load current
`rating.
`Separate fuses or an inverse time circuit breaker rated or
`set at not more than 150 percent of the motor fullload
`current is provided in the motor branchcircuit.
`
`(E) Isolating Switches. For stationary motors rated at more
`than 40 hp de or 100 hp ac, the disconnecting means shall be
`permitted to be a general-use or isolating switch where plainly
`marked “Do not operate under load.”
`
`(F) Cord-and-Plug-Connected Motors. For a cord-and-plug-
`connected motor, a horsepowerrated attachment plug and
`receptacle, flanged surface inlet and cord connector, or attach-
`ment plug and cord connector having ratings no less than the
`motor ratings shall be permitted to serve as the disconnecting
`means. Horsepower-rated attachment plugs, flanged surface
`inlets, receptacies, or cord connectors shall not be required for
`cord-and-plug-connected appliances in accordance with 422.33,
`room air conditioners in accordance with 440.63, or portable
`motors rated 4 hp orless.
`
`the disconnecting
`(G) Torque Motors. For torque motors,
`means shall be permitted to be a general-use switch.
`
`430.110 Ampere Rating and Interrupting Capacity.
`
`(A} General. The disconnecting means for motor circuits
`rated 1060 volts, nominal, or jess shall have an ampere rating
`not less than 115 percent of the fulltoad current rating of the
`motor.
`
`Exception: A listed unfused motor-circuit switch having a horsepower
`rating not less than. the motor horsepower shall be permitted to have an
`ampere rating less than LL) percent of the full-load current rating of
`the motor.
`
`(B) For Torque Motors. Disconnecting means for a torque
`motor shall have an ampere rating of at least 115 percent of the
`motor nameplate current.
`(C) For Combination Loads. Where two or more motors are
`used together or where one or more motors are used in combi-
`nation with ether loads, such as resistance heaters, and where
`the combined load may be simultaneous on a single discon-
`necting means,
`the ampere and horsepower ratings of the
`combined load shall be determined as follows.
`
`(1) Horsepower Rating. The rating of the disconnecting
`means shall be determined from the sum of all currents,
`including resistance loads, at the full-load condition and also at
`the locked-rotor condition. The combined fullload current
`and the combined locked-rotor current so obtained shall be
`considered as a single motor for the purpose of this require-
`ment as follows.
`
`The full-ioad current equivalent to the horsepowerrating of
`each motor
`shall
`be
`selected
`from Tabie
`430,247,
`Table 430.248, Table 430.249, or Table 430.250. These fullioad
`currents shall be added to the rating in amperes of other loads
`to obtain an equivalent fullload current for the combined
`load.
`
`to the horsepower
`The locked-rotor current equivalent
`rating of each motor shall be selected from Table 430.251 (A)
`or Table 430.251(B). The locked-rotor currents shall be added
`to the rating in amperes of other loads to obtain an equivalent
`locked-rotor current for the combined load. Where two or
`more motors or other loads cannot be started simultaneously,
`the largest sum of locked-rotor currents of a motor or group of
`motors that can be started simultaneously and the fullioad
`currents of other concurrent loads shall be permitted to be
`used to determine the equivalent locked-rotor current for the
`simultaneous combined loads. In cases where different current
`
`Page 318 of 881
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`

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`
`ARTICLE 430 — MOTORS, MOTOR CIRCUITS, AND CONTROLLERS
`
`ratings are obtained when applying these tables, the largest
`value obtained shall be used.
`
`Exception: Where part of the concurrent load is resistance load, and
`where the disconnecting means is a switch rated in horsepower and
`amperes, the switch used shall be permitted to have a horsepowerrating
`that is not less than the combined load of the motor(s), if the ampere
`rating of the switch is nat
`less than the locked-roter current of the
`motar(s) plus the resistance load.
`
`(2) Ampere Rating. The ampere rating of the disconnecting
`means shall not be less than 115 percent of the sum of all
`currents at the fullload condition determined in accordance
`with 430.110(C) (1).
`
`Exception: A listed nonfused motor-circuit switch having a horsepower
`rating equal
`to or greater than the equivalent horsepower of the
`combined loads, determined in accordance with 430. 110(C)(1), shalt
`be permitied to have an ampere rating less than 115 percent of the sum
`ofall currenis at thefull-load condition.
`
`(3) Small Moters. For small motors not covered by Table
`430.247, Table 430.248, Table 450.249, or Table 430.250, the
`locked-rotor current shail be assumed to be six times the full-
`load current.
`
`430.111 Switch or Circuit Breaker as Both Controller and
`Disconnecting Means.
`<A switch or circuit breaker shall be
`permitted to be used as both the controller and disconnecting
`means if it complies with 430.111(A) and is ome of the types
`specified in 430.111(B).
`
`(A) General. The switch or circnit breaker complies with the
`requirements for controllers specified in 430.83, opens all
`ungrounded conductors to the motor, and is protected by an
`overcurrent device in each ungrounded conductor (which shall
`be permitted to be the branch-circuit fuses}, The overcurrent
`device protecting the controller shall be permitted to be part of
`the controller assembly or shall be permitted to be separate. An
`aultotransformer-type controller shall be provided with a sepa-
`rate disconnecting means.
`
`(B) Type. The device shall be one of the types specified in
`430.111(B)(1), (B) (2), or (B) (3).
`
`{a} Where a number of motors drive several paris of a single
`machine or plece of apparatus, such as metal and wood