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CENTERLINE 2100 MCC Specifications
Part I Sections and Busses
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Items for next revision Bus bracing Items continuous in the shipping block
This is updated to the Sept 2006 Price book
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Agenda Sections and Busses Specifications
CENTERLINE 2100 Low Voltage Motor Control Centers Enclosure types Basic MCC sections for plug-in units Sections for frame-mount MCC units MCC bus systems
Power bus Ground bus
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MCC Enclosure
Enclosure types
Download this white paper at: http://www.nema.org/prod/be/enclosures/
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MCC Enclosure
Enclosure types NEMA Type 1 protection
Accidental contact Body parts Tools
Rust and corrosion
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MCC Enclosure
NEMA Type 1G: Closed-cell neoprene gasket around doors (only) as shown
Enclosure types NEMA Type 1G
Protection same as NEMA Type 1
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MCC Enclosure
NEMA Type 12: additional gasket material added to wireways and covers as shown
Note: If vents or fans are present, they will
be filtered and gasketed
Note: If vents or fans are present, they will
be filtered and gasketed
Gaskets also on top plates, back plates and end plates every
removable cover
NEMA Type 12 also includes bottom plates
Enclosure types NEMA Type 12
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MCC Enclosure
Enclosure types NEMA Type 12 protection
NEMA Type 1 plus: Falling dirt & dust Splashing water
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MCC Enclosure
Enclosure types NEMA Type 3R
Note: NEMA Type 1 MCC located inside this steel
enclosure
Top View
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MCC Enclosure
Enclosure types NEMA Type 3R Protection
Type 1 protection plus: Rain, snow, sleet Ice buildup
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MCC Enclosure
Enclosure types NEMA Type 4 Note: NEMA Type
1 MCC located inside stainless steel enclosure
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MCC Enclosure
Enclosure types NEMA Type 4 protection
NEMA 1 protection plus: Wind-blown dust Falling rain, snow, sleet Splashing Hose-directed water
Designed for bottom entry of conduit
Top conduit entries require special fittings to maintain protection
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MCC Enclosure
Enclosure types NEMA Type 12 stainless steel
NEMA Type 12 protection plus Light splashing
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Quiz time!
CENTERLINE 2100 MCCs are available in which of the following enclosure types? NEMA Type 1 NEMA Type 3 NEMA Type 4X NEMA Type 12
NEMA Type 3 is not offered NEMA Type 3R is available. NEMA Type 3 offers additional protection against windblown dust.
NEMA Type 4X is not offered NEMA Type 4 is available. NEMA Type 4X offers additional protection against corrosive agents.
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Quiz Time!
The following statements are true about NEMA 3R enclosures except: Consist of a standard NEMA Type 1 enclosure inside a larger cabinet Walk-in construction for protection against weather when servicing Are 5 inches wider and 10 inches deeper than the sections they contain Provide a degree of protection against rain, snow and sleet Are offered as CENTERLINE 2100 enclosure option
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Agenda Sections and Busses Specifications
CENTERLINE 2100 Low Voltage Motor Control Centers Enclosure types Basic MCC sections for plug-in units Sections for frame-mount MCC units MCC bus systems
Power bus Ground bus
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MCC Terminology Basic Sections
0.5 1.0
3.5
2.5
Many possible unit combinations
section section section
Definition: A basic MCC section accepts plug-in units
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MCC Terminology Sections - Wireways
Bottom horizontal wireway
Top horizontal wireway
Vertical wireways
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MCC Terminology Sections - Wireways
Vertical and horizontal
wireways used for motor cables
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MCC Terminology Sections - Wireways
Vertical and horizontal
wireways used for control wires
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MCC Terminology
Bottom horizontal wireway cover
Top horizontal wireway cover
Vertical wireway door
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MCC Terminology - Sections
Horizontal power bus
Access to horizontal wireway
Enlarged view of horizontal wireway opening showing rolled edges
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Quiz Time!
The vertical and horizontal wireways can be used to: Route motor leads to conduit entries Route control wires to a centralized I/O chassis Route control wires between various units All the above
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Basic Sections
Basic sections built to accept plug-in units Include vertical bus and vertical wireway
Section widths, basic sections 20 standard
Includes 4 3/8 wide X 7 deep standard vertical wireway
25 optional Vertical wireway width expanded to 9 Unit width opening is same
20 25
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Typical Basic Section Dimensions
20
Standard Dimensions 90 tall (not incl. lift angle) 20 wide 15 deep
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Plug-in Unit Area
20
Top View of Section
~14 x 10 Plug-in unit area
1
5
Section footprint Horizontal bus Vertical bus (3x) Vertical bus cover Vertical wireway Unit door Vertical wireway
door
FRONT
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Plug-in Unit Area
Stab Assy
8x5/8 x 14 unit working area
Top View of Section
4-3/8 x 7 vertical wireway
FRONT
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20 Deep Basic Section
Horizontal bus is same distance from front of plug-in MCC
sections
NOTE: Two horizontal
wireway access points
20
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Basic Sections Reduced Height
90 Section height (standard) 6.0 Space factors
71 Section height (optional) 4.5 Space factors Standard height horizontal bus
Can connect to 90 section Lower horizontal bus
Cannot splice to 90 section Main incoming unit restrictions
Top-fed main requires lower bus
Bottom-fed main requires standard bus
90 71
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Back-to-Back Sections
30 back-to-back 40 back-to-back
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Back-to-Back Sections
Made up of two separate sections Except no back plates on either
Two separate horizontal power bus systems Same A-B-C phasing on both sides
Two separate vertical power bus systems Front section loading is independent from back
section Shipping block can contain up to six sections
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Review Basic CENTERLINE 2100 MCC Sections
Accept plug-in units Plug-in unit space is always the same width and depth
14 wide 10 deep (including stab housing)
8 5/8 working depth in the unit Standard width 20
Optional width 25 with 5 wider wireway Standard depth 15
Optional depth 20 but bus depth is unchanged from 15 deep Standard height 90
Optional height 71 with optional horizontal bus locations Back-to-Back configuration available
Shipping block up to 6 sections
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Quiz Time!
The following characteristic differentiates a basic section from other section types: NEMA Type 1 enclosure Accepts plug-in units CENTERLINE horizontal bus Gasket material
The main differentiator for a basic section is that it is designed to accept plug-in units. It will also have vertical wireways and a vertical power bus.
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Quiz Time!
The main difference between a 15 deep basic section and a 20 deep basic section is that the 20 deep section: Requires a larger plug-in unit Has the horizontal bus located 5 farther back into the structure Has a top mounted horizontal bus Has an additional 5 space behind the horizontal bus All the above
The bus structure in a 20 deep basic section is in the exact same location as in a 15 deep basic section (with respect to the front of the section). The extra depth results in more space behind the horizontal bus. All plug-in units have the same width and depth dimensions only their heights can vary.
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Quiz Time!
Back-to-back section arrangements: Are available as two back-to-back 15 sections (30 deep) Are available as two back-to-back 20 sections (40 deep) Have separate horizontal busses front and rear Have separate vertical busses front and rear Can be shipped in a six-section shipping block All the above
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Agenda Sections and Busses Specifications
CENTERLINE 2100 Low Voltage Motor Control Centers Enclosure types Basic MCC sections for plug-in units Sections for frame-mount MCC units MCC bus systems
Power bus Ground bus
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Sections for Frame-Mounted Units
When units are too large, heavy, or draw too much current, they are permanently mounted in the MCC structure
Stab assembly and vertical busses not used Vertical wireway often not present
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Sections for Frame-Mounted Units
Unit hardware is permanently mounted in section Power connections are bolted directly to horizontal bus Only available as assembled units in sections
As opposed to plug-in units and sections which can be ordered separately
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Sections for Frame-mounted Units
Section widths Widths from 20 to 40 Depends on size of equipment installed Or heat generated by equipment
Depth: 15 or 20 Frame mount sections 25 and wider
Shipping block = 1 section Back to back sections must be same width
Shipping block = 2 sections
20 25 30 35 40
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Sections for Frame-mounted Units
Frame-mount section depth Standard depth 15 Optional depth 20 Horizontal bus offsets as required Depends on size of equipment installed
15
20
Front
Front
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Miscellaneous MCC Sections
Corner Section
FRONT
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Quiz Time!
The two main CENTERLINE 2100 section types are: Vertical and horizontal Basic and plug-in Basic and sections for frame-mount units 15 and 20 inches
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Quiz Time!
Frame-mount units are used when the components to be mounted are: To large to be reasonably plugged in To heavy to be reasonably plugged in Draw too much current for the stab assembly All of the above
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Agenda Sections and Busses Specifications
CENTERLINE 2100 Low Voltage Motor Control Centers Enclosure types Basic MCC sections for plug-in units Sections for frame-mount MCC units MCC bus systems
Power bus systems Ground bus systems
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MCC Bus System
Horizontal Bus Vertical Bus Ground Bus
Horizontal Vertical plug-in ground
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MCC Horizontal Bus Materials & Sizes
Horizontal Bus Sizes Materials
Material 600A 800A 1000A 1200A 1600A 2000A 2500A 3000A
Aluminum 1/8 x 4 3/16 x 4 N/A N/A N/A N/A N/A N/A
Copper 1/8 x 3 1/8 x 4 3/16 x 4 1/4 x 4 1/2 x 4 5/8 x 4 3/4 x 4 3/4 x 4*
Aluminum bus is tin plated. Copper bus may be tin plated or silver plated. * Rated at 3000A in 20 in deep enclosure only
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MCC Vertical Bus
Vertical Bus Sizes
3/4 Tubular (300A) 3/4 Solid (600A)
Materials Tin plated copper Silver plated copper
Horizontal bus material determines vertical bus material: Horizontal Bus Vertical Bus Material/Finish Material/Finish Aluminum/Tin Copper/Tin Copper/Tin Copper/Tin Copper/Silver Copper/Silver
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MCC Ground Bus System
Ground Bus Horizontal Ground Bus
Sizes 1/4 x 1 (500A) 1/4 x 2 (900A)
Materials & finish Unplated copper Tin-plated copper
Used to terminate motor ground cable Locations
Top horizontal wireway Bottom horizontal wireway Both top & bottom wireways
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MCC Ground Bus System
Ground Bus System Vertical Plug-in Ground Bus
First-make-last-break w/ground stab Left hand side of section Plated steel standard* Unplated copper or tin-plated copper available
Back view of MCC unit
*zinc chromate
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MCC Ground Bus System
Ground Bus System Unit Load Ground Bus
Optional equipment Unplated copper or tin-plated copper Used to terminate 4-wire motor leads at unit
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Summary of MCC Bus System
Power bus system Horizontal power bus
Distributes power to entire MCC lineup Materials
Aluminum 600A & 800A only, tin-plated finish only Copper 600A to 3000A available, tin or silver-plated finish
Vertical power bus Distributes power within a single section Copper only silver or tin-plated finish matches horizontal bus 300A tubular or 600A solid bar construction
Ground bus system Horizontal ground bus
Top, bottom, or top and bottom mounted Unplated copper or tin-plated copper x 1 or x 2 size (500A or 900A)
Vertical plug-in ground bus (plated steel, copper, tin-plated copper) Optional vertical unit-load ground bus (copper, tin-plated copper) If one part of ground bus system is tin-plated, all parts must be tin-plated
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Advantage of CENTERLINE Bus
By feeding the vertical bus in the center, you can fully load the MCC section from the center up and the center down
Thus, the effective section loading for a section with 300A vertical bus is 600A
And for 600A vertical bus, 1200A Benefits for customer:
Flexible unit locations Cooler bus operation
300 600
300 600
600A 1200A
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Quiz Time!
The three main bus systems in a CENTERLINE 2100 MCC are: Vertical, horizontal, ground Plug-in, vertical, tubular Power, ground, plug-in None of the above
The materials used in CENTERLINE 2100 bus systems are: (select all that apply) Copper Aluminum Tin plating Silver plating Zinc-chromate plated steel Gold plating
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Quiz Time!
The following are true about vertical busses except: Available as 300 and 600 Ampere conductors Available with tin or silver plating Available in aluminum or copper Fed from the middle by the horizontal bus All of the above are true
In a typical CENTERLINE 2100 MCC The capacity of the horizontal bus will be greater than that of the vertical bus The capacity of the vertical bus will be greater than that of the horizontal bus The plated finish of the vertical bus must match that of the ground bus The vertical ground bus is located in the vertical wireway
For comments and questions on this module, please contact [email protected]
