Motor Control Centers
Remake batch 25 and its neighbor re-points, batch 24 where missing, and the adopted-electrical-code parameter: brought in line with the authoring repository
Showing changes from Rev 8
to Rev 9
in Motor Control Centers.
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title: Motor Control Centers
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When to use: Factory-assembled, floor-standing low-voltage motor control centers rated 600 V and below, listed to UL 845 and built to NEMA ICS 18, in which combination motor starter units, reduced-voltage starter units, variable frequency drive units, feeder units, control power units, and metering units plug onto a common vertical bus fed from a common horizontal bus. Covers the assembly ratings, the enclosure and structure, the bus, the wiring class and type, arc-flash mitigation, the unit construction and the devices inside each unit, communications, identification, factory and field testing, installation, warranty, and spares, for indoor and outdoor installations.
− Not intended for: Individually enclosed combination and manual motor starters serving one motor ([[sync/combination-motor-starters]]); distribution switchboards and switchgear without plug-in motor control units ([[sync/low-voltage-switchboards]], [[sync/low-voltage-switchgear]]); panelboards ([[sync/panelboards]]); medium-voltage motor controllers above 600 V; the performance, harmonic treatment, and configuration of the variable frequency drives installed as unit contents ([[sync/hvac-variable-frequency-drives]]); the motors served; the short-circuit, coordination, and arc-flash studies that establish the ratings and settings ([[sync/arc-flash-study]]); and the building automation or process control system to which the assembly reports ([[sync/building-automation-system]], [[sync/process-control-networks]]).
+ Not intended for: Individually enclosed combination and manual motor starters serving one motor ([[sync/combination-motor-starters]]); distribution switchboards and switchgear without plug-in motor control units ([[sync/low-voltage-switchboards]], [[sync/low-voltage-switchgear]]); panelboards ([[sync/panelboards]]); medium-voltage motor controllers above 600 V; the performance, harmonic treatment, and configuration of the variable frequency drives installed as unit contents ([[sync/hvac-variable-frequency-drives]]); the motors served; the short-circuit, coordination, and arc-flash studies that establish the ratings and settings ([[sync/short-circuit-study]], [[sync/protective-coordination-study]], [[sync/arc-flash-study]]); and the building automation or process control system to which the assembly reports ([[sync/building-automation-system]], [[sync/process-control-networks]]).
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- the drive performance, harmonic treatment, bypass logic, and parameter configuration of variable frequency drive units, under [[sync/hvac-variable-frequency-drives]]
- the motors served, their nameplate data, and their disconnecting means at the motor
−- the short-circuit, protective device coordination, and arc-flash incident energy studies, under [[sync/arc-flash-study]]
+- the short-circuit, protective device coordination, and arc-flash incident energy studies, under [[sync/short-circuit-study]], [[sync/protective-coordination-study]], and [[sync/arc-flash-study]]
- the power and control conductors and their terminations, under [[sync/conductors-and-cables]]
- the raceways serving the assembly, under [[sync/raceways-and-conduit]]
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# Identification {toc}
−## Nameplates shall be furnished on the assembly, on each vertical section, and on each unit, and shall comply with [[sync/electrical-identification]] for material, lettering, and attachment.
+## Nameplates shall be furnished on the assembly, on each vertical section, and on each unit, and shall comply with [[sync/equipment-labeling]] for material, lettering, and attachment.
## The assembly nameplate shall state the assembly designation, the system voltage, the horizontal bus rating, the assembly short-circuit current rating, the series-rated combinations where series rating is the basis, and the source that feeds the assembly.
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### The Contractor shall obtain a signed receipt from the Owner for the spare units and components delivered.