NEMA ICS2 Class I & II (MCC Definitions)

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Class I – Independent Units

Class I motor control centers shall consist of mechanical
groupings of combination motor control units, feeder tap
units, other units, and electrical devices arranged in a conve-
nient assembly. The manufacturer shall furnish drawings that
include;
(a) Overall dimensions of the motor control center, identifica-
tion of units and their location in the motor control center,
locations of incoming line terminals, mounting dimen-
sions, available conduit entrance areas, and the location of
the master terminal board if required (Type C wiring only).
(b) Manufacturer’s standard diagrams for individual units and
master terminal boards (Type C wiring only), consist of a
drawing(s) that:
1. Identifies electrical devices.
2. Indicates electrical connections.
3. Indicates terminal numbering designations.
Note:
When a combination schematic and/or wiring diagram for a
unit(s) is supplied showing optional devices, the manufactur-
er shall provide information to indicate which devices are actu-
ally furnished.


Class II – Interconnected Units

Class II motor control centers shall be the same as Class I
motor control centers with the addition of manufacturer fur-
nished electrical interlocking and wiring between units as
specifically described in overall control system diagrams sup-
plied by the purchaser.
In addition to the drawings furnished for Class I motor control
centers, the manufacturer shall furnish drawings that indicate
factory interconnections within the motor control center.