16444 - Moulded Case Main Distribution Centre



|Section Cover Page |

| Section 16444 |

|Moulded Case |

|2000-06-01 Main Distribution Centre |

Use this Section to specify requirements for a building main distribution centre where the ampacity of the building service is:

.1 between 250 and 1200 Amperes at 120/208/240 volts,

.2 between 250 and 800 Amperes at 277/480 volts,

.3 between 250 and 800 Amperes at 347/600 volts,

and where fault levels at service entrance are less than 50,000 Amperes symmetrical.

Specification includes options for moulded case main breaker or industrial air circuit main breaker.

Specification also includes "component" type main distribution centre.

Include Section 16215 - Utility Metering when this Section is used.

This Master Specification Section contains:

.1 This Cover Sheet

.2 Data Sheet - Reference Documents

.3 Data Sheet - Sample Schedule

.4 Specification Section Text:

1. General

1.1 Related Sections

1.2 Reference Documents

1.3 Product Data

1.4 Coordination

2. Products

2.1 Preassembled Type Main Distribution Centre

OR

2.1 Component Type Main Distribution Centre

3. Execution

3.1 Installation

3.2 Schedule

Applicable Standards

.1 CSA C22.2 No. 29-M1989(R1995) Panelboards and Enclosed Panelboards

.2 CAN/CSA-C22.2 No. 76-M92 Splitters

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

Main Distribution Centre, 120/208 Volts, 3 Phase, 4 Wire

| | | | | | |

|Load |Breaker |Poles |Trip |GFP |Feeder |

| |Frame Size | | | | |

| | | | | | |

|Main |400 |3 |400 |yes |100 mm 4#500 MCM |

|Breaker | | | | |RW90 X-Link |

| | | | | | |

|Panel A |225 |3 |150 |no |50 mm 4#1/0 |

| | | | | |RW90 X-Link |

| | | | | | |

|Panel B |100 |3 |100 |no |32 mm 4#3 |

| | | | | |RW90 X-Link |

| | | | | | |

|MCC #1 |225 |3 |200 |no |50 mm 3#1/0 |

| | | | | |RW90 X-Link |

Note: Breaker Spaces: 3 - 3 Pole 100 Ampere Frame

4 - 3 Pole 225 Ampere Frame

END OF DATA SHEETS

1. General

1.1 RELATED SECTIONS

.1 CAST-IN-PLACE CONCRETE: SECTION 03300.

.2 Electrical General Requirements: Section 16010.

.3 Electrical Identification: Section 16075.

.4 Utility Metering: Section 16215.

.5 Main Distribution Centre Metering: Section 16216.

.6 Distribution Panelboards: Section 16441.

.7 Overcurrent Protective Devices: Section 16443.

1.2 REFERENCE DOCUMENTS

.1 CSA C22.2 NO. 29-M1989 - PANELBOARDS AND ENCLOSED PANELBOARD.

.2 CAN/CSA-C22.2 No. 76-M92 - Splitters.

1.3 PRODUCT DATA

.1 COMPLY WITH REQUIREMENTS OF SECTION 16010.

.2 Provide manufacturer's product data for all systems and components.

.3 Provide data on recommended environmental conditions for equipment affected by temperature.

1.4 COORDINATION

.1 COORDINATE SIZE AND LOCATION OF CONCRETE HOUSEKEEPING BASES WITH WORK SPECIFIED IN SECTION 03300.

2. Products

2.1 PREASSEMBLED TYPE MAIN DISTRIBUTION CENTRE

.1 MAIN DISTRIBUTION CENTRE: TO CSA C22.2 NO. 29-M1989 AND AS FOLLOWS:

SPEC NOTE:  Aluminum not permitted where bus size exceeds 600 Amperes.

.1 Bus Characteristics:

.1 Capacity: [400] [    ] Amperes.

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

.3 Bracing: [50,000] [     ] Amperes symmetrical.

.4 Neutral: full capacity, solid neutral design.

.5 Ground bus: copper.

.2 Enclosure:

.1 Prefinished painted sheet steel.

.2 Uniform height, depth and width.

.3 Internal barriers to separate the various components.

.4 Bushed ports or buspads in barriers.

.5 Separate barriered compartment for metering transformers.

SPEC NOTE:  Confirm space requirements for metering transformers with Utility.

.6 Main breaker compartment suitable for mounting drawout breaker.

SPEC NOTE:  Main breaker to be drawout type when ampacity exceeds 600 Amperes.

.7 Component arrangement as indicated on drawings.

.8 [Drip cover.]

SPEC NOTE:  Specify drip cover only when main distribution centre is installed in an area with sprinklers.

.3 Trim:

.1 Sectionalized.

.2 [Screw-on] [     ] cover over main breaker.

.3 Hinged cover with sealing studs over metering transformer section.

.4 [Hinged door on door construction] [Screw-on] [Hinged] cover dished back to breaker faces with [no] [hinged locking door] over feeder breaker section.

SPEC NOTE:  Use hinged locking door when main distribution centre is installed in a room with sprinklers. For panel boards containing adjustable trips use hinged door on door construction only.

.4 Overcurrent Protective Devices: As specified in Section 16443 and as follows:

.1 Main breaker: bolt-in, moulded case.

.2 Feeder breakers: bolt-in, moulded case.

.5 Ground Fault Protection: As specified in Section 16443.

.6 Coordination Curves: As specified in Section 16443.

OR

2.1 COMPONENT TYPE MAIN DISTRIBUTION CENTRE

SPEC NOTE:  COMPONENT TYPE MAIN DISTRIBUTION CENTRE MAY ONLY BE USED FOR SERVICES 400 AMPERES AND SMALLER. REVIEW WITH APWSS PRIOR TO USING.

.1 Main Distribution Centre shall consist of the following components:

.1 Overcurrent Protective Devices: as specified in Section 16443 and as follows:

.1 Main Breaker: Mounted in EEMAC 1 enclosure.

.2 Feeder Breakers: Mounted in [separate EEMAC 1 enclosure] [distribution centre as specified in Section 16441].

.3 Metering: As specified in Section 16215.

.2 Splitter: to CAN/CSA-C22.2 No. 76-M92 and as follows:

.1 Bus Characteristics:

.1 Capacity: 400] [     ] Amperes.

.2 Construction: Rectangular section [copper].

.3 Lugs: Copper, bolted to bus, compression type.

.4 Neutral: [Full] [     ] capacity.

.5 Ground bus: Copper.

3. Execution

3.1 INSTALLATION

SPEC NOTE:  USE THIS "INSTALLATION" ARTICLE IF PREASSEMBLED TYPE MAIN DISTRIBUTION CENTRE HAS BEEN SPECIFIED.

.1 Install main distribution centre securely, plumb and square to adjoining surfaces on [100 mm concrete housekeeping base] [wall].

SPEC NOTE:  Delete all references to concrete bases when main distribution centre is wall mounted.

.2 Connect main service cable(s) to main breaker.

.3 Connect loads to feeder breakers as specified in Main Distribution Centre Schedule.

.4 Provide main distribution centre breaker sizes and identification as specified in Main Distribution Centre Schedule.

OR

3.1 INSTALLATION

SPEC NOTE:  USE THIS "INSTALLATION" ARTICLE IF COMPONENT TYPE MAIN DISTRIBUTION CENTRE HAS BEEN SPECIFIED.

.1 Wall mount all main distribution centre components in compact configuration.

.2 Connect main service cable(s) to main breaker.

.3 Cable connect main breaker to metering transformers and [splitter] [distribution panelboard].

.4 Connect loads to feeder breakers as specified in Main Distribution Centre Schedule.

.5 Provide main distribution centre breaker sizes and identification as specified in Main Distribution Centre Schedule.

3.2 SCHEDULE

MAIN DISTRIBUTION CENTRE, [    ] VOLTS, [  ] PHASE, [  ] WIRE

| | | | | | |

|Load |Breaker |Poles |Trip |GFP |Feeder |

| |Frame Size | | | | |

| | | | | | |

|[     ] |[       ] |[    ] |[    ] |[       ] |[         ] |

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SPEC NOTE:  Delete column for ground fault protection (GFP) when system is not specified.

END OF SECTION

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