E77.REV

BUSWAYS

NOTE: MASTER COPY DATE: OCT. 29, 1984

Part 1 -	GENERAL

1)	DESCRIPTION

A.	Busways complete with fittings and accessories meeting NEMA Standards and UL labeled

2)	SUBMITTALS

A.	Shop drawings:

1.	Dimesioned layout on Architectural background drawings.

2.	Catalog cuts.

Part 2 -	PRODUCTS

1)	MATERIALS

A.	Insulators:

1.	Dielectric strength to withstand:

a.	1,000 volts.

b.	2 times rated voltage between live parts and enclosure and between live parts of opposite polarity for 1 minute.

2.	Moisture absorption: maximum 1 percent by volume.

3.	Shape and space to protect against tracking and flashover.

B.	Supports:

1.	Insulators: steel channel members clamped with tie rods.

2.	Housing: 5 ft on center and at floor levels when vertically mounted.

3.	Distribution assemblies:

a.	Bus supported maximum size:

mp

(1)	100 amp fusible switches.

(2)	400 amp molded case circuit breakers.

mp

b.	-----in. by -----in. by -----in. cable tap boxes

c.	Building structure supported:

(1)	Equipment larger than noted above.

C.	Bus bars:

Part 3 -	1.	Copper: hard drawn, minimum 98 percent conductivity silver plated

2.	Aluminum: ECT, 61 alloy, minimum 57 percent conductivity electro-tin plate

Part 4 -	1.	Silver or electro-tin plated.

2.	Temperature rise: ambient over entire length at rated capacity

3.	Bolt joints with Belleville washer over flat washer.

4.	Low impedance feeder bus:----- percent voltage drop per 100 ft..

5.	High impedance feeder bus: -----percent voltage drop per 100 ft..

6.	Plug in bus:-----percent voltage drop per 100 ft.

7.	----- percent power factor.

8.	Lugs for distribution assemblies: as required.

9.	Tape full length and joints with , class B insulation.

A.	Enclosure:

NOTE: - CHECK FOR TOTALLY ENCLOSED BUSWAY rEQUIREMENTS.

1.	Perforated sheet steel.

2.	Solid covers at:

a.	Joints (and removable).

5

(A)	in. each side of walls.

5

(B)	ft above and 6 in. below floors.

ar

3.	Copper ground bar: 25 percent of phase capacity.

4.	Aluminum ground bar: 50 percent of phase capacity.

ar

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

NOTE: DELETE FOR TOTALLY ENCLOSED BUS.

6.	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 PROO

7.	Non-ferrous metal shields: 6 in. below each side of busway in sprinklered areas.

B.	Busways:

1.	10 ft sections.

2.	Suitable for flat, edgewise and vertical mounting.

3.	Service type:

a.	High impedance:

(1)	Reduce symmetrical short circuit current from ----- amp at supply end to ----- amp at load end.

(2)	Brace for supply end maximum symmetrical short circuit.

b.	Low impedance:

(1)	Short circuit rating: as indicated on drawings.

c.	Rating: as indicated on drawings.

4.	Feeder type:

a.	Low impedance:

(1)	Short circuit rating: as indicated on drawings.

b.	Ratings: as indicated on drawings.

5.	Plug-in type:

a.	Short circuit rating: as indicated on drawings..

b.	Ratings: as indicated on drawings.

c.	Plug-in openings on 24 in.) centers with cover plates. Provide openings on both sides of bus.

C.	Plug-in units:

1.	As noted with ON , OFF indicating handles and suitable for hookstick operation

2.	Enclosures: sheet steel housings with hinged cover.

3.	Silver plated stabs enclosed in insulators.

4.	Suitable for side conduit entry.

OTE: CHECK CODE RESTRICTIONS

D.	Cable tap boxes:

1.	Sizes as indicated.

2.	With cable terminals.

3.	End or center mounting.

1)	BASE BID MANUFACTURERS

A.	General Electric.

B.	Westinghouse.

C.	Square D.

D.	I-T-E.

E.	Lexington.

Part 5 -	EXECUTION

1)	INSTALLATION

A.	Under manufacturer's supervision.

B.	Minimum mounting height: 8 ft- 0 in. above finished floor.

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

D.	Temporary covers over exposed bus during construction.

E.	Fire stops: through floors and fire walls.

F.	At floor openings: furnish 4 in. x 4 in. concrete curb and seal with noncombustible material

G.	3 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 connections 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 effect 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 run phase to phase and phase to ground

C.	Test Values

1.	Bus bolt torque values shall be in accordance with manufacturer's recommendations

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