Attachment 3 - 262500 ENCLOSED BUS ASSEMBLIES.pdf

JUBA ELECTRICAL UPGRADE DEVELOPMENT July 13, 2020

JUBA SOUTH SUDAN Issued for Bid

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 1

SECTION 262500 - ENCLOSED BUS ASSEMBLIES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Feeder-bus assemblies.

2. Plug-in bus assemblies.

3. Bus plug-in devices.

1.3 DEFINITIONS

A. kAIC: kiloampere interrupting capacity.

B. SPD: Surge protective device.

1.4 ACTION SUBMITTALS

A. Shop Drawings: For each type of product.

1. Show fabrication and installation details for enclosed bus assemblies. Include plans, elevations, and sections of components. Designate components and accessories, including clamps, brackets, hanger rods, connectors, straight lengths, and fittings.

2. Show fittings, materials, fabrication, and installation methods for [listed firestop barriers] [and] [weather barriers].

3. Indicate required clearances, method of field assembly, and location and size of each field connection.

4. Detail connections to switchgear, switchboards, transformers, and panelboards.

5. Cable and conductor terminal sizes for bus and plug-in device terminations.

6. Wiring Diagrams: Power[ and signal] [ and control] [, signal, and control] wiring.

B. Delegated-Design Submittal: For seismic-restraint details, signed and sealed by a qualified professional engineer.

1. Include design calculations for selecting seismic restraints.

2. Detail fabrication, including anchorages and attachments to structure and to supported equipment.

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 2

1.5 INFORMATIONAL SUBMITTALS

A. Coordination Drawings: Floor plans and sections, drawn to scale. Include scaled bus-assembly layouts and relationships between components and adjacent structural, mechanical, and electrical elements. Show the following:

1. Vertical and horizontal enclosed bus-assembly runs, offsets, and transitions.

2. Clearances for access above and to the side of enclosed bus assemblies.

3. Vertical elevation of enclosed bus assemblies above the floor or bottom of structure.

4. Support locations, type of support, and weight on each support.

5. Location of adjacent construction elements including luminaires, HVAC and plumbing equipment, fire sprinklers and piping, signal and control devices, and other equipment.

B. Qualification Data: For testing agency.

C. Seismic Qualification Certificates: For enclosed bus assemblies,[ plug-in devices,] accessories, and components.

1. Basis for Certification: Indicate whether withstand certification is based on actual test of assembled components or on calculation.

2. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.

3. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.

D. Field quality-control reports.

1.6 CLOSEOUT SUBMITTALS

A. Operation and Maintenance Data: For enclosed bus assemblies to include in emergency, operation, and maintenance manuals.

1.7 MAINTENANCE MATERIAL SUBMITTALS

A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Plug-in Units: [10] <Insert number> percent of amount installed[ for each size indicated], but no fewer than <Insert number> unit(s).

1.8 QUALITY ASSURANCE

A. Testing Agency Qualifications: Member company of NETA.

1. Testing Agency's Field Supervisor: Certified by NETA to supervise on-site testing.

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 3

1.9 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, and handle enclosed bus assemblies according to NEMA BU 1.1, "General

Instructions for Handling, Installation, Operation, and Maintenance of Busway Rated 600 Volts or Less."

PART 2 - PRODUCTS

2.1 ASSEMBLY DESCRIPTIONS

A. Source Limitations: Obtain enclosed bus assemblies[ and plug-in devices] from single source from single manufacturer.

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

C. Comply with UL 857.

2.2 PERFORMANCE REQUIREMENTS

A. Delegated Design: Engage a qualified professional engineer, as defined in Section 014000

"Quality Requirements," to design enclosed bus assemblies, plug-in devices, and components.

B. Seismic Performance: Enclosed bus assemblies, plug-in devices, and components shall withstand the effects of earthquake motions determined according to [ASCE/SEI 7] <Insert requirement>.

1. The term "withstand" means "the unit will remain in place without separation of any parts when subjected to the seismic forces specified[ and the unit will be fully operational after the seismic event]."

2. Component Importance Factor: [1.5] [1.0].

C. Derate enclosed bus assemblies for continuous operation at indicated ampere ratings for ambient temperature not exceeding [122 deg F (50 deg C)] [140 deg F (60 deg C)] <Insert ambient temperature>.

2.3 ENCLOSED BUS ASSEMBLIES

A. Feeder-Bus Assemblies: Low-impedance bus assemblies in totally enclosed, nonventilated housing; single-bolt joints; ratings as indicated.

1. <Double click here to find, evaluate, and insert list of manufacturers and products.>

2. Seismic Fabrication Requirements: Fabricate mounting provisions and attachments for feeder-bus assemblies with reinforcement strong enough to withstand seismic forces defined in Section 260548.16 "Seismic Controls for Electrical Systems" when mounting provisions and attachments are anchored to building structure

3. Electrical Characteristics:

http://www.specagent.com/LookUp/?ulid=2067&mf=04&src=wd

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 4

a. Voltage: [120/208] [240] [480] [277/480] V.

b. Phase: Three; [3 wire] [4 wire].

c. Percent of Neutral Capacity: [50] [100] [200] <Insert value>.

4. Short-Circuit Interrupting Rating:

a. For Bus Amperage of 800: 85 symmetrical kAIC.

b. For Bus Amperage of 1200: 100 symmetrical kAIC.

c. For Bus Amperage of 1600: 125 symmetrical kAIC.

d. For Bus Amperage of 2500: 150 symmetrical kAIC.

e. For Bus Amperage of 5000: 200 symmetrical kAIC.

5. Temperature Rise: 55 deg C above 40 deg C ambient maximum for continuous rated current.

6. Bus Materials: Current-carrying [copper ] [aluminum] conductors, fully insulated with

Class 130C insulation except at joints; plated surface at joints.

7. Voltage Drop:

a. Measure voltage drop at 30 deg C ambient with bus thermally stabilized at full rated load.

b. Three-phase, line-to-line voltage drop less than 3.1 V per 100 feet (30.5 m) at 40 percent power factor.

8. Ground: 50 percent capacity, integral with housing.

9. Ground: 50 percent capacity, internal bus bar of material matching bus material.

10. Ground: 50 percent capacity, isolated, internal bus bar of material matching bus material.

11. Enclosure: [Steel] [Aluminum], with manufacturer's standard finish.[ Weatherproof, sealed seams, drains, and removable closures.]

12. Fittings and Accessories: Manufacturer's standard.

13. Firestop: Comply with UL 1479 firestop system, listed and labeled by an NRTL acceptable to authorities having jurisdiction for penetrations of fire-rated walls, ceilings, and floors.

14. Mounting: Arranged flat, edgewise, or vertically without derating. Rated for hanger spacing of up to 10 feet (3 m) for horizontally mounted runs and up to 16 feet (5 m) for vertically mounted runs.

15. Expansion Section: Manufacturer's standard expansion fitting for the provided busway with expansion capability to accommodate thermal expansion of bus and enclosure, and to accommodate movement across building expansion joints.

B. Plug-in Bus Assemblies: Low-impedance bus assemblies in totally enclosed, nonventilated housing; single-bolt joints; ratings as indicated.

1. <Double click here to find, evaluate, and insert list of manufacturers and products.>

2. Electrical Characteristics:

a. Voltage: [120/208] [240] [480] [277/480] V.

b. Phase: Three; [3 wire] [4 wire].

c. Percent of Neutral Capacity: [100] [200] <Insert value>

3. Short-Circuit Interrupting Rating:

http://www.specagent.com/LookUp/?ulid=12232&mf=04&src=wd

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 5

a. For Bus Amperage of 800: 85 symmetrical kAIC.

b. For Bus Amperage of 1200: 100 symmetrical kAIC.

c. For Bus Amperage of 1600: 125 symmetrical kAIC.

d. For Bus Amperage of 2500: 150 symmetrical kAIC.

e. For Bus Amperage of 5000: 200 symmetrical kAIC.

4. Temperature Rise: 55 deg C above 40 deg C ambient maximum for continuous rated current.

5. Bus Materials: Current-carrying [copper] [aluminum] conductors, fully insulated with

Class 130C insulation except at stabs and joints; plated surface at stabs and joints.

6. Ground: 50 percent capacity, integral with housing.

7. Ground: 50 percent capacity, internal bus bar of material matching bus material.

8. Ground: 50 percent capacity, isolated, internal bus bar of material matching bus material.

9. Enclosure: [Steel] [Aluminum], with manufacturer's standard finish.

10. Plug-in Openings: 24 inches (600 mm) o.c. on each side of bus, and hinged covers over unused openings. Plug-in openings shall be finger-safe with covers open or closed.

11. Fittings and Accessories: Manufacturer's standard.

12. Firestop: Comply with UL 1479 firestop system, listed and labeled by an NRTL acceptable to authorities having jurisdiction for penetrations of fire-rated walls, ceilings, and floors.

13. Mounting: Arranged flat, edgewise, or vertically without derating. Rated for hanger spacing of up to 10 feet (3 m) for horizontally mounted runs and up to 16 feet (5 m) for vertically mounted runs.

14. Expansion Section: Manufacturer's standard expansion fitting for the provided busway with expansion capability to accommodate thermal expansion of bus and enclosure, and to accommodate movement across building expansion joints.

C. Joints:

1. Busway joints shall use one high-strength steel bolt with Belleville washers.

2. Bolts shall be torque indicating type and at ground potential.

3. Bolts shall be two-headed design to indicate when proper torque has been applied and require only a standard long handle wrench to be properly activated.

4. Access shall be required to only one side of the busway for tightening joint bolts.

5. Joint connection assemblies shall be removable without disturbing adjacent busway lengths.

6. Joint connection assemblies that rely on the joint cover to provide ground continuity are unacceptable.

2.4 PLUG-IN DEVICES

A. Fusible Switches: NEMA KS 1, heavy duty; with [R-type rejection] [J-type] [L-type] fuse clips to accommodate specified fuses; hookstick-operated handle, lockable with two padlocks, and interlocked with cover in closed position. Interlocked to prevent plug-in device insertion into or removal from bus with switch in closed position. See Section 262813 "Fuses" for fuses and fuse installation requirements.

1. <Double click here to find, evaluate, and insert list of manufacturers and products.> http://www.specagent.com/LookUp/?ulid=2151&mf=04&src=wd

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 6

B. Molded-Case Circuit Breakers: UL 489; hookstick-operated handle, lockable with two padlocks, and interlocked with cover in closed position. Interlocked to prevent plug-in device insertion into or removal from bus with switch in closed position.

1. <Double click here to find, evaluate, and insert list of manufacturers and products.>

C. SPD: NEMA 250, Type 1 enclosure with NEMA KS 1, fusible, disconnect switch and external handle to isolate SPD from busway. SPD product and installation requirements are specified in

Section 264313 "Surge Protection for Low-Voltage Electrical Power Circuits."

1. <Double click here to find, evaluate, and insert list of manufacturers and products.>

D. Motor Controllers: NEMA ICS 2, Class A, full voltage, nonreversing, across the line unless otherwise indicated.

1. <Double click here to find, evaluate, and insert list of manufacturers and products.>

2. Control Circuit: 120 V; obtained from [integral control power transformer] <Insert source of control power> with a control power [transformer] [source] of enough capacity to operate connected pilot, indicating and control devices, plus 100 percent spare capacity.

3. Combination Controller: Factory-assembled combination controller and disconnect switch with or without overcurrent protection as indicated.

a. Fusible Disconnecting Means: NEMA KS 1, heavy-duty, fusible switch with [R-type rejection] [J-type] fuse clips rated for fuses. Select and size fuses to provide

Type 2 protection according to IEC 60947-4-1, as certified by an NRTL acceptable to authorities having jurisdiction. See Section 262813 "Fuses" for fuses and fuse installation requirements.

b. Circuit-Breaker Disconnecting Means: UL 489, motor-circuit protector with field-adjustable, short-circuit trip coordinated with motor locked-rotor amperes.

4. Overload Relay: Ambient-compensated type with inverse-time-current characteristic and

NEMA ICS 2, [Class 10] [Class 20] [Class 30] tripping characteristic. Overload relays shall have heaters or sensors in each phase matched to nameplate full-load current of specific motor to which they connect and with appropriate adjustment for duty cycle.

5. Adjustable Overload Relay: Dipswitch selected for motor running overload protection with NEMA ICS 2, [Class 10] [Class 20] [Class 30] tripping characteristic, and selected to protect motor against voltage and current unbalance and single phasing. Adjustable overload relays shall have Class II ground-fault protection with start and run delays to prevent nuisance trip on starting.

E. Multispeed Magnetic Controllers: Match controller to motor type, application, and number of speeds.

1. <Double click here to find, evaluate, and insert list of manufacturers and products.>

2. Compelling relay ensures motor starts only at low speed.

3. Accelerating relay ensures properly timed acceleration through speeds lower than that selected.

4. Decelerating relay ensures automatically timed deceleration through each speed.

F. Accessories: Hookstick operator, adjustable to maximum extension of [14 feet (4.3 m)] <Insert dimension>.

http://www.specagent.com/LookUp/?ulid=2155&mf=04&src=wd http://www.specagent.com/LookUp/?ulid=7047&mf=04&src=wd http://www.specagent.com/LookUp/?ulid=2902&mf=04&src=wd http://www.specagent.com/LookUp/?ulid=2170&mf=04&src=wd

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 7

PART 3 - EXECUTION

3.1 INSTALLATION

A. Coordinate layout and installation of enclosed bus assemblies and suspension system with other construction that penetrates ceilings or floors or is supported by them, including luminaires, HVAC equipment, fire-suppression system, and partition assemblies.

B. Equipment Mounting:

1. Install enclosed bus assemblies on cast-in-place concrete equipment base(s). Comply with requirements for equipment bases and foundations specified in Section 033000

"Cast-in-Place Concrete."

2. Coordinate size and location of concrete curbs around openings for vertical bus.

Concrete, reinforcement, and formwork requirements are specified with concrete.

C. Support bus assemblies independent of supports for other elements such as equipment enclosures at connections to panelboards and switchboards, pipes, conduits, ceilings, and ducts.

1. Design each fastener and support to carry load indicated by seismic requirements and to comply with seismic-restraint details according to Section 260548.16 "Seismic Controls for Electrical Systems."

2. Design each fastener and support to carry 200 lb (90 kg) or 4 times the weight of bus assembly, whichever is greater.

3. Support bus assembly to prevent twisting from eccentric loading.

4. Support bus assembly with not less than [3/8-inch (10-mm)] <Insert dimension> steel rods. Install side bracing to prevent swaying or movement of bus assembly. Modify supports after completion to eliminate strains and stresses on bus bars and housings.

5. Fasten supports securely to building structure according to Section 260529 "Hangers and

Supports for Electrical Systems."

6. Bolts and nuts that are loosened for any reason after tightening to manufacturer's recommended torque setting shall be discarded and replaced with new bolts and nuts.

D. Install expansion fittings at locations where bus assemblies cross building expansion joints.

Install at other locations so distance between expansion fittings does not exceed manufacturer's recommended distance between fittings.

E. Construct rated firestop assemblies where bus assemblies penetrate fire-rated elements such as walls, floors, and ceilings. Seal around penetrations according to Section 078413 "Penetration

Firestopping."

F. Install weatherseal fittings and flanges where bus assemblies penetrate exterior elements such as walls or roofs. Seal around openings to make weathertight. See Section 079200 "Joint Sealants" for materials and application.

G. Coordinate bus-assembly terminations to equipment enclosures to ensure proper phasing, connection, and closure.

H. Tighten bus-assembly joints with torque wrench or similar tool recommended by bus-assembly manufacturer. Tighten joints again after bus assemblies have been energized for 30 days.

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 8

I. Install bus-assembly, plug-in units. Support connecting conduit independent of plug-in unit.

J. Comply with NECA 1.

3.2 CONNECTIONS

A. Ground equipment according to Section 260526 "Grounding and Bonding for Electrical

Systems."

B. Connect wiring according to Section 260519 "Low-Voltage Electrical Power Conductors and

Cables."

C. Terminate to transformer enclosures with matching bus assemblies according to Section 262200

"Low-Voltage Transformers."

D. Terminate to switchgear enclosures with matching bus assemblies according to Section 262300

"Low-Voltage Switchgear."

E. Terminate to switchboard enclosures with matching bus assemblies according to

Section 262413 "Switchboards."

F. Terminate to panelboard enclosures with matching bus assemblies according to Section 262416

"Panelboards."

G. Terminate to motor-control centers enclosures with matching bus assemblies according to

Section 262419 "Motor-Control Centers."

3.3 FIELD QUALITY CONTROL

A. Testing Agency: [Owner will engage] [Engage] a qualified testing agency to perform tests and inspections.

B. Manufacturer's Field Service: Engage a factory-authorized service representative to test and inspect components, assemblies, and equipment installations, including connections.

C. Perform the following tests and inspections[ with the assistance of a factory-authorized service representative]:

1. After installing equipment test, for compliance with requirements according to

NETA ATS.

2. Visual and Mechanical Inspection:

a. Compare equipment nameplate data with Drawings and Specifications.

b. Inspect physical and mechanical condition.

c. Inspect anchorage, alignment, and grounding.

d. Verify correct connection according to single-line diagram.

e. Inspect bolted electrical connections for high resistance using one or more of the following methods:

1) Use of low-resistance ohmmeter.

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 9

2) Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method according to manufacturer's published data.

3) Perform thermographic survey.

3. Electrical Tests:

a. Perform insulation resistance measurements through bolted connections and bus joints with low-resistance ohmmeter.

b. Perform insulation resistance tests of each busway, phase to phase, and phase to ground.

c. Perform a dielectric withstand voltage test on each busway, phase to ground with phases not under test grounded for one minute.

d. Measure resistance of assembled busway sections on insulated busway and compare values with adjacent phases.

e. Perform phasing test on each busway tie section energized by separate sources.

f. Verify operation of busway space heaters.

D. Infrared Scanning: After Substantial Completion, but not more than 60 days after Final

Acceptance, perform an infrared scan of each switch. Remove all access panels so joints and connections are accessible to portable scanner.

1. Instrument: Use an infrared scanning device designed to measure temperature or to detect significant deviations from normal values. Provide calibration record for device.

2. Record of Infrared Scanning: Prepare a certified report that identifies switches checked and that describes scanning results. Include notation of deficiencies detected, remedial action taken, and observations after remedial action.

3. Follow-up Infrared Scanning: Perform an additional follow-up infrared scan of each switch 11 months after date of Substantial Completion.

E. Test Labeling: On completion of satisfactory testing of each unit, attach a dated and signed

"Satisfactory Test" label to tested component.

F. Enclosed bus assemblies will be considered defective if they do not pass tests and inspections.

G. Prepare test and inspection reports.

3.4 ADJUSTING

A. Set field-adjustable, circuit-breaker trip ranges[ and overload relay trip settings] as indicated.

3.5 CLEANING

A. Vacuum dirt and debris; do not use compressed air to assist in cleaning.

3.6 PROTECTION

A. Provide final protection to ensure that moisture does not enter bus assembly.

ENCLOSED BUS ASSEMBLIES SECTION 262500 - 10

END OF SECTION 262500