16446 - Fused Main Distribution Centre



|Section Cover Page |

| Section 16446 |

|Fused |

|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 1200 amperes and larger at 120/208 volts,

.2 800 amperes and larger at 277/480 volts,

.3 800 amperes and larger at 347/600 volts,

.4 fault levels at service entrance are in excess of 50,000 amperes symmetrical.

Two types of switches are specified. Edit specification carefully, and use switches that suit the application.

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 and Shop Drawings

1.4 Coordination

2. Products

2.1 Main Distribution Centre

3. Execution

3.1 Installation

3.2 Testing

3.3 Schedule

Applicable Standards

.1 CAN/CSA-C22.2 No. 31-M89(R1995) Switchgear Assemblies

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.

Fused Main Distribution Centre 347/600 Volts, 3 Phase, 4 Wire

| | | | | | |

|Load |Fused Switch |Poles |Fuse |GFP |Feeder |

| |Size (Amps) | |Size | | |

| | | | | | |

|Main Switch |1600 |3 |1600 |yes |4 - 100 mm |

|Switch | | | | |4#500 MCM |

| | | | | |RW90 X-Link |

| | | | | | |

|Transformer | | | | | |

|T1 |800 |3 |600 | |2 - 63 mm |

| | | | | |3#300 MCM |

| | | | | |RW90 X-Link |

| | | | | | |

|MCC No. 1 |800 |3 |800 | |2 - 63 mm |

|T.D. | | | | |3#300 MCM |

| | | | | |RW90 X-Link |

| | | | | | |

|Panel 6A |200 |3 |150 | |50 mm 4#1/0 |

| | | | | |RW90 X-Link |

Note: Fused Switch Spaces: 1 - 3 pole 400 Amp frame size

2 - 3 pole 200 Amp frame size

4 - 3 pole 100 Amp frame size

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 Operation and Maintenance Data: Section 16020.

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

.5 Electrical Identification: Section 16075.

.6 Utility Metering: Section 16215.

.7 Main Distribution Centre Metering Section 16216.

.8 Overcurrent Protective Devices: Section 16443.

.9 Testing, Adjusting, and Balancing

of Electrical Equipment and Systems: Section 16970.

1.2 REFERENCE DOCUMENTS

.1 CAN/CSA-C22.2 NO 31-M89 - SWITCHGEAR ASSEMBLIES.

1.3 PRODUCT DATA AND SHOP DRAWINGS

.1 COMPLY WITH REQUIREMENTS OF SECTION 16010.

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

.3 Provide wiring diagrams of main distribution centre indicating interrelationship between:

.1 Shunt trips.

.2 Ground fault protection.

.3 Utility metering.

.4 Distribution centre metering.

.5 Key interlocks.

.6 Remote control features.

.7 [                      ].

.8 Other major elements.

Clearly differentiate between factory wiring and field wiring.

1.4 COORDINATION

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

2. Products

2.1 MAIN DISTRIBUTION CENTRE

.1 FUSED MAIN DISTRIBUTION CENTRE TO CAN/CSA-C22.2 NO 31-M89 AND AS FOLLOWS:

.1 Bus Characteristics:

.1 Capacity: [1200] [     ] Amperes.

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

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

.4 Bus arrangement, viewing main distribution centre from front:

.1 Left Terminal: Phase A

.2 Centre Terminal: Phase B

.3 Right Terminal: Phase C

.5 Neutral: full capacity, solid neutral design.

.6 Ground bus: copper, full length of main distribution centre.

.2 Enclosure:

.1 Prefinished painted sheet steel.

.2 Uniform height, depth and width.

.3 Separate compartment to house fused main switch and each fused feeder switch.

.4 Bushed ports or buspads in barriers.

.5 Component arrangement as detailed on Drawings.

.6 Separate barriered compartment for metering transformers.

.7 Fused switch compartment complete with pressure relief vent.

.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 Hinged cover with sealing studs over metering transformer section.

.3 Hinged cover for each fused switch compartment.

.4 Manual Switches:

.1 Heavy duty, quick make, quick break, visible contact position.

.2 Assembly: modular enclosure.

.3 Mechanism: spring assist open/close.

.4 Primary Contacts: low resistance load contacts with arc quenching.

.5 Fuse Holders: [bolt-on] [constant pressure fuse clips] designed for fuse type specified.

.6 Cover: dead front interlocked with switch.

.7 Operation: manual operating handle.

.8 Position Indication: external.

.5 Stored Energy Switches:

.1 Type: stored energy, spring driven, trip free.

.2 Assembly: modular enclosure.

.3 Mechanism: manual close/charging handle.

.4 Primary Contacts: mechanical maintained pressure load contacts with arc quenching.

.5 Fuse Holders: bolt-on fuse holders suitable for fuses specified with blown fuse single phase protection.

.6 Cover: dead front hinged door interlocked with switch.

.7 Operation: [manual] [electric] trip.

.8 Position Indication: open/close.

.9 Interrupting Rating: [22] [40] [65] K Amperes symmetrical.

.10 Auxiliary Contacts: [2] [     ] form C.

SPEC NOTE:  Add the following items when ground fault protection feature is required.

.11 Ground Fault Protection: ground fault sensing/tripping unit complete with power supply operable at 55 per cent of service supply voltage.

.2 Overcurrent Protective Devices: as specified in Section 16443, indicated in schedule and as follows:

.1 Main Fuses:

.1 HRC [J] [R] [L] non time delay.

.2 Feeder Fuses:

.1 HRC [J] [R] [L] non time delay.

.2 HRC [J] [R] [L] time delay.

.3 [As noted in Schedule.]

.4 [As noted on drawings.]

3. Execution

3.1 INSTALLATION

.1 INSTALL MAIN DISTRIBUTION CENTRE ON 100 MM CONCRETE HOUSEKEEPING PAD.

.2 Tighten electrical connectors and terminals, including screws and bolts, in accordance with equipment manufacturer's published torque tightening values.

.3 Connect main service entrance cable(s) to line bus stubs in rear of main switch cubicle.

.4 Connect load to feeder switches as specified in Fused Main Distribution Centre Schedule.

.5 Adjust operating mechanisms for free mechanical movement.

.6 Touch up scratched or marred surfaces to match original finish.

.7 Fused switch sizes and identification as specified in Fused Main Distribution Centre Schedule.

3.2 TESTING

.1 COMPLY WITH REQUIREMENTS OF SECTION 16970.

3.3 SCHEDULE

FUSED MAIN DISTRIBUTION CENTRE

[      ] Volts [    ] Phase [    ] Wire [    ] Amperes

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|Load |Fused Switch |Poles |Fuse |GFP |Feeder |

| |Size (Amps) | |Size | | |

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

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

SPEC NOTE:  Identify time delay fuses by abbreviation "TD" in fuse size column.

END OF SECTION

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