Section Cover Page
Section 16422
2000-06-01Motor Control Centres

Use this Section to specify modular or grouped motor control centres. (Refer to Date SheetGeneral). To avoid duplication, specify technical requirements for all motor starters in Section16421. This applies to units that are individually mounted in EEMAC1 enclosure or mounted in a motor control centre. Specify control components associated with each starter in Section16151Connection of Equipment.

This Master Specification Section contains:

.1This Cover Sheet

.2Data Sheet – Reference Documents

.3Data SheetGeneral

.4Specification Section Text:

1.General

1.1Related Sections

1.2Product Data

1.3Operation and Maintenance Data

1.4Coordination

1.5Maintenance Materials

2.Products

2.1Modular Motor Control Centres

2.2Grouped Motor Control Centres

2.3Control Relays

2.4Time Delay Relays

3.Execution

3.1Installation

3.2Protection of Completed Work

3.3Testing

BMS Basic Master Specification
Alberta Infrastructure
Master Specification System / Page 0
Data Sheet - Reference Documents
Section 16422
2000-06-01Motor Control Centres

Applicable Standards

.1CSA C22.2 No. 14-95Industrial Control Equipment

These reference documents may be available for reference purposes in the Technical Resources and Standards Branch Library, Alberta Infrastrucure, 3rd Floor, 6950 - 113 Street, Edmonton; Telephone:(780) 427-7924.

BMS Basic Master Specification
Alberta Infrastructure
Master Specification System / Page 01
Data Sheet - General
Section 16422
2000-06-01Motor Control Centres

CONFIGURATIONS

This Section includes technical requirements for two different configurations of motor control centres. Modular motor control centres are generally used where there is a large number of motors (more than eight) located in a defined area such as mechanical room or penthouse. Grouped motor control centres should be considered when the number of motors is less than eight or more than three and where starter sizes do not exceed size 2 by EEMAC standards.

CLASSIFICATION OF CONTROL CENTRES

Motor control centres are classified as follows:

EEMAC ClassI:This type of motor control centre has no interwiring between starters and/or control units. Each unit has independent circuitry.

EEMAC ClassII:This type of motor control centre incorporates control unit circuitry special for the application and involves electrical interlocking, interwiring between various units, and also interlocking provisions to remote mounted devices.

CLASSIFICATION OF WIRING

Motor control centre wiring is classified as follows:

EEMAC Type A:No factory wiring for control. All control wiring connected directly to control terminals or magnetic starter.

EEMAC Type B: Control terminals factory wired to terminal blocks for control wiring. Terminal blocks are placed either in the vertical wireway or in the starter unit.

EEMAC TYPE B MODIFIED:Control terminals factory wired to terminal blocks for control wiring. Terminal blocks are located in the control terminal section of the motor control centre.

EEMAC Type C:Control terminals factory wired to terminal blocks for control wiring. Terminal blocks are grouped in master terminal compartments (one for each control centre vertical section) located adjacent to conductor entry areas.

END OF DATA SHEETS

BMS Basic Master Specification
Alberta Infrastructure
Master Specification System / Page 01
Section 16422
Plan No:Motor Control Centres
Project ID:Page 1

1.General

1.1RELATED SECTIONS

.1Hard Wired Fire Alarm System:Section 13851.

.2Mechanical Equipment Controls:Section[ ].

.3Electrical General Requirements:Section 16010.

.4Electrical Operation and Maintenance Data:Section 16020.

.5Electrical Spare Parts and Maintenance Materials:Section 16030.

.6Cabinets and Enclosures:Section 16136.

.7Motor Starters:Section 16421.

.8Testing, Adjusting and Balancing of Electrical Equipment and Systems:Section 16970.

1.2PRODUCT DATA

.1Comply with requirements of Sections 16010.

1.3OPERATION AND MAINTENANCE DATA

.1Comply with requirements of Section 16020.

1.4COORDINATION

.1Coordinate installation with Section13851Hard Wired Fire Alarm System and Section[ ]Mechanical Equipment Controls to provide an complete integrated functional system.

1.5MAINTENANCE MATERIALS

.1Comply with requirements of Section 16030.

2.Products

2.1MODULAR MOTOR CONTROL CENTRES

.1Motor control centres to CSAC22.2No.1495 and as follows:

.1Bus Characteristics:

.1Capacity:[300] [] Amperes.

.2Construction:rectangular section copper, [silver] [tin] plated joints.

.3Bracing:[42,000] [] Amperes symmetrical.

.4Neutral:[None] [].

.5Ground bus:[Copper].

SPEC NOTE:Aluminum bus not permitted where bus capacity exceeds 600 amperes.

.2General Construction:

.1To EEMAC standards for construction of [ClassI] [ClassII] motor control centre with type [A] [B] [Bmodified] [C] wiring.

SPECNOTE:Refer to Data Sheet for motor control centre classification and wiring.

.2Dead front, multiunit, modular type with assembly of vertical stacks containing cubicles sized to house equipment required.

.3Minimum height per module: [] [305]mm. Each module shall house combination starter, [disconnect breaker], [fused disconnect switch], relays, and control transformer as per schedule.

.4Horizontal bussing across top or centre and vertical bussing down each stack.

.5Wiring gutter across top and bottom and vertically down each stack. Wiring gutter shall be barriered from busway compartments.

.6Each combination starter or disconnect switch assembly shall be mounted in tub or rack assembly of removable plugin type with necessary bus connection stabs.

.7Blank combination starter spaces shall have hinged cover section provided with full bussing to receive future rack assemblies.

SPECNOTE:Delete the following when motor control centre wiring is TypeA or TypeC.

.3Control Terminal Section:integral part of motor control centre with height as indicated on drawings and following features:

.1Barriered from adjacent [208] [] volt sections.

.2No bus work or bus supports.

.3Solid backpan at rear of MCC for installation of control terminals.

.4Section full depth of MCC.

.5Control terminal strips for all wiring.

.4Combination Magnetic Motor Starters:as specified in Section16421.

2.2GROUPED MOTOR CONTROL CENTERS

.1Motor control centres to CSAC22.2No.1495 and as follows:

.1Assembly:[combinationstarters] [disconnectbreakers] [fused disconnect switches] [relays] transformers mounted in common enclosure and connected to multiple terminal bus lugs.

.2Ampacity: [200] [400] Amperes.

.3Voltage: [208] []Volts, 3phase, [3] [4] wire, 60Hz.

.4Control Terminal Cabinet:as specified in Section 16136.

.5Combination Magnetic Motor Starters:as specified in Section16421.

SPECNOTE:The following items are considered auxiliary. Incorporate only when required.

2.3CONTROL RELAYS

.1Rating: [10] [15] []amperes, [300] [600] volts AC [].

.2Coil: [120] [208] []Volts AC.

.3Poles:as required.

.4Enclosure:EEMAC [1] or mounted in [control terminal section of motor control centre] [control terminal cabinet].

2.4TIME DELAY RELAYS

.1Time Delay Relays:as specified in 2.3 but also incorporating pneumatic time delay feature to delay [energization] [deenergization].

.2Time delay period:adjustable from [0 to 5] [] minutes.

.3Enclosure [EEMAC] [1] or mounted in [control terminal section of motor control centre] [control terminal cabinets].

3.Execution

3.1INSTALLATION

.1Set and secure modular motor control centre in place [on channel base] [concrete housekeeping pad].

.2Wall mount grouped motor control centres.

.3Make field power [and control] connections as indicated.

.4Provide heater elements to suit motors installed.

.5Provide [breakers] [fuses] to suit motors installed.

.6Tighten bus connections and mechanical fasteners to assure permanent and effective connection.

.7Adjust operating mechanisms for free mechanical movement.

.8Touchup scratched or marred surfaces to match original finish.

.9Mount current sensors for EMCS monitoring on individual starter backpan not in wire ways.

3.2PROTECTION OF COMPLETED WORK

.1Protect motor control centres to prevent entry of duct, paint and other foreign matter.

3.3TESTING

.1Comply with requirements of Section 16970.

END OF SECTION