E07.REV

BUSWAYS

NOTE: FINAL DATE: JUNE 1988.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following:

1.	Busways with fittings and accessories in accordance with NEMA Standards and UL labeled.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION No. 1 and Section GENERAL PROVISIONS FOR ELECTRICAL WORK apply to all work in this Section.

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	LOW VOLTAGE DISTRIBUTION SYSTEM.

2.	UNIT SUBSTATION.

3.	MOTOR CONTROL CENTERS.

4.	GROUNDING DEVICES.

5.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section.

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR ELECTRICAL WORK for additional Reference Standards.

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR ELECTRICAL WORK for Guarantee and other Quality Assurance requirements.

5)	SUBMITTALS

A.	Submit shop drawings for busways including dimensioned layout on Architectural background drawings and catalog cuts.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	General Electric, Westinghouse, Square D., I-T-E and Lexington.

2)	INSULATORS

A.	Dielectric strength shall withstand 1,000 volts and 2 times rated voltage between live parts and enclosure and between live parts of opposite polarity for 1 minute.

B.	Moisture absorption shall be maximum 1 percent by volume.

C.	Shape and space shall protect against tracking and flashover.

3)	SUPPORTS

A.	Insulators shall be steel channel members clamped with tie rods.

B.	Housing shall be supported 5 ft. on center and at floor levels when vertically mounted utilizing steel channels, trapeze hangers, tie rods as required. Provide cantilevered supports where indicated.

C.	Distribution assemblies:

1.	Bus supported maximum size shall be:

a.	100 amp fusible switches.

b.	400 amp molded case circuit breakers.

2.	Provide -----inch by -----inch by ----- inch cable tap boxes.

3.	Building structure supported shall be for equipment larger than noted above.

4)	BUS BARS:

A.	Copper shall be hard drawn, minimum 98 percent conductivity.

B.	Aluminum shall be ECT, 61 alloy, minimum 57 percent conductivity.

C.	Bus bars shall be silver or electro-tin plated.

D.	Temperature rise shall be 55 deg above 30 deg C ambient over entire length at rated capacity.

E.	Provide insulated bolt joints and nut with captive Belleville washer over flat washer. Joint covers with captive hardware.

F.	Low impedance feeder bus shall be ----- percent voltage drop per 100 ft.

G.	High impedance feeder bus shall be -----percent voltage drop per 100 ft.

H.	Plug in bus shall be -----percent voltage drop per 100 ft..

I.	Lugs for distribution assemblies shall be as required.

J.	Tape full length and joints with 130 deg C , class B insulation.

5)	ENCLOSURE

NOTE: CHECK FOR TOTALLY ENCLOSED BUSWAY REQUIREMENTS.

A.	Provide perforated sheet steel with solid covers at joint (removable), 6 inch each side of walls and 6 ft. above and 6 inch below floors.

B.	Copper ground bar shall be 25 percent of phase capacity.

C.	Aluminum ground bar shall be 50 percent of phase capacity.

D.	Fasten ground bar to busway 5 ft. on centers and at enclosure joints. Connect to service ground.

NOTE: DELETE FOR TOTALLY ENCLOSED BUS.

E.	For horizontal runs in garages, provide metal enclosures with wire mesh bottom panels.

NOTE: CHECK TRADES PROVIDING PIPING FOR DRIP PANS AND CHECK SPRINKLER LAYOUT IF FOLLOWING IS FEASIBLE. DELETE: FOR TOTALLY ENCLOSED AND WEATHER PROOF

F.	Non-ferrous metal shields shall be 6 inches below each side of busway in sprinklered areas.

6)	BUSWAYS

A.	Provide 10 ft. sections suitable for flat, edgewise and vertical mounting.

B.	Service type:

NOTE: CHIEF ENGINEER TO APPROVE USE OF HIGH IMPEDANCE BUS.

1.	High impedance: Reduce symmetrical short circuit current from ----- amp at supply end to ----- amp at load end and brace for supply end maximum symmetrical short circuit.

2.	Low impedance: Short circuit rating shall be as indicated on drawings.

3.	Rating shall be as indicated on drawings.

C.	Feeder type:

1.	Low impedance: Short circuit rating shall be as indicated on drawings.

2.	Ratings shall be as indicated on drawings.

D.	Plug-in type:

1.	Short circuit rating shall be as indicated on drawings.

2.	Ratings shall be as indicated on drawings.

3.	Provide plug-in openings on 24 inch centers with cover plates. Provide openings on both sides of bus.

7)	PLUG-IN UNITS

A.	Provide plug-in units as noted with ON , OFF indicating handles and suitable for hookstick operation.

B.	Enclosures shall be compatible with busway housing and of similar fabrication.

C.	Provide silver plated stabs enclosed in insulators.

D.	Plug-in units shall be suitable for side conduit entry.

E.	Interlock to prevent unit from being installed or removed from busway while switch is in ON position.

NOTE: CHECK CODE RESTRICTIONS.

8)	CABLE TAP BOXES

A.	Sizes shall be as indicated. Provide with cable terminals and provide end or center mounting.

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Installation shall be under manufacturer's supervision.

B.	Minimum mounting height shall be 8 ft. 0 inches above finished floor.

C.	Maintain access at all points except passing through construction.

D.	Provide temporary covers over exposed bus during construction.

E.	Fire stops shall be through floors and fire walls.

F.	At floor openings, furnish 4 inch x 4 inch concrete curb and seal with noncombustible material.

G.	Provide manufacturer's made expansion fitting across all building expansion joints.

2)	TESTS

A.	Visual and Mechanical Inspection.

1.	Bus shall be inspected for physical damage, cleanliness and proper connection.

2.	Check tightness of bolted joints by calibrated torque wrench method.

3.	Make a thermographic survey to evaluate the connection of the bus duct. This shall be made with the unit in operation under maximum loaded conditions.

4.	Make a close inspection for any indication of environmental influence of the bus enclosure or any other foreign material which could affect insulation resistance by reducing clearance phase to phase or phase to ground.

B.	Electrical Tests.

1.	Insulation Resistance Tests.

a.	Measure insulation resistance of each bus run phase to phase and phase to ground for one (1) minute as 1000 V.D.C.

2.	Perform overpotential tests on each bus phase to phase and phase to ground.

C.	Test Valves.

D.	Bus bolt torque valves shall be in accordance with manufacturer's recommendations.

E.	Insulation resistance valves shall be in accordance with manufacturer's values.