Class6090

Class6090
Class 6090
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APRI.L, 1987
Non-Segregated
600V -15,000V 1200V- 4000V
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POWER ZONE®
Metal-Enclosed Bus
CONTENTS
Class
Description
Pages
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FILE: Distribution Products Catalog
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Class
Description
Pages
CABLE BUS
NONSEGREGATED BUS
3
6090
4
6090
6090
5
6090
6
7-9
6090
6090
10
6090 ...... 11-12
6090
13
6090
14
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6090
6090
6090
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15
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MISCELLANEOUS
Project Checklist . . 0
Additional Products
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6090
6090
19
20
II tl SQUARED I:DMPANY
•
•
0
APRIL, 1987
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POWER ZONE METAL-ENCLOSED BUS
FLANGED END
(SWITCHGEAR CONNECTION)
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This bar only
for one bar
per phase
I
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Equip. Mtg.
Surface
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B--
See
Detail
Below
---
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SIDE VIEW
End of Factory
Insulation
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Noryl Sleeve
Typical
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Bus Duct &
Equip. Opening
A
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FRONT VIEW (A·A)
A
an
Bus Duct &
Equip. Opening
.56" x
.75" Slots
(Typ. )
BAR
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.87"-1 �-87" t -.j + �
(6"
(4" Wide Bar)
Voltage: 15000 v
(!)
(2)
(2)
(2)
A
A
A
A
A
A
''8"
8.12"
7.87"
8.00"
7.87"
9.87"
0.31"
0.31"
0.75"
0.75"
0.75"
Voltage: 15000 v
Cont.
Current
Rating
1200
1600
2000
2500
3000
4000
.37" X 4"
.62" X 4"
.50" X 4"
.62" X 4"
.62" X 6"
"A"
Bus Bars
Per Phase
(1)
(!)
(2)
(2)
(2)
(2)
Cont.
Current
Rating
.37" X
.50" X
.37" X
.50" X
.62" X
.62" X
4"
4"
4"
4"
4"
6"
Bus Bars
Per Phase
1200 A (!) .25" X 4"
1600 A (1) .37" X 4"
2000 A (!) .62" X 4"
2500 A (2) .50" X 4"
3000 A (2) .62" X 4"
4000 A (2) .62" X 6"
8.12"
8.00"
8.12"
8.00"
7.87"
9.87"
0.31"
0.31"
0.75"
0.75"
0.75"
0.75"
Voltage:
"A"
''8"
8.25"
8.12"
7.87"
8.00"
7.87"
9.87"
0.31"
0.31"
0.31"
0.75"
0.75"
0.75"
15000 v
Bus Bars
Per Phose
A (1)
A (I)
A (1)
A (!)
A (2)
A (2)
.25" X
.25" X
.37" X
.62" X
.37" X
.62" X
4"
4"
4"
4"
4"
4"
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1200
1600
2000
2500
3000
4000
"D"
"E "
"F"
"G"
1.37"
1.37"
1.37"
14"
14"
16"
16"
16"
31"
31"
31"
31"
37"
10"
10"
12"
12"
12"
27"
27"
27"
27"
33"
Aluminum
"C"
--
Housing:
"D"
"E "
14"
14"
31"
31"
31"
31"
31"
37"
1.37"
1.37"
1.37"
1.37"
16"
16"
16"
16"
"F"
10"
10"
"I"
"J"
"K"
6.00"
6.00"
4.75" 2.37"
4.75" 2.37"
4.75" 2.37"
5.81"
5.81"
5.81"
5.81"
5.87"
2.87"
2.87"
2.87"
2.87"
5.81"
HH"
Aluminum
"G"
27"
27"
27"
27"
27"
33"
Totally Enclosed
•
•
"H"
--
"C"
,.D"
--
---
1.37"
1.37"
1.37"
14"
14"
14"
16"
16"
20"
Conductor: Aluminum
"A"
" 8"
8.25"
8.25"
8.12"
7.87"
8.12"
7.87"
0.31"
0.31"
0.31"
0.31"
0.75"
0.75"
" C"
-----
1.37"
1.37"
12"
12"
12"
12"
--
4.75"
4.75"
4.75"
4.75"
Ventilated
"I"
"J"
"K"
6.00"
6.00"
2.37"
2.37"
2.37"
2.37"
5.81"
5.81"
5.81"
5.81"
5.81"
5.87"
2.87"
2.87"
2.87"
2.87"
2.87"
5.81"
Housing: Aluminum - Totally Enclosed
Conductor: Aluminum
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Cont.
Current
Rating
"8"
Voltage: 15000 v
"C"
Conductor:
" A"
Housing: Aluminum
lec
(!)
Conductor: Aluminum
"E"
.E
1200 A
1600 A
2000 A
2500 A
3000 A
4000 A
Bus Ban
Per Phase
31"
31"
31"
31"
31"
37"
"F"
"G"
10"
10"
10"
12"
12"
16"
27"
27"
27"
27"
27"
33"
Housing:
"E"
"F "
"G"
14"
14"
14"
14"
16"
16"
31"
31"
31"
31"
31"
31"
10"
10"
10"
10"
12"
12"
27"
27"
27"
27"
27"
27"
. . ...
,.H "
6.00"
-6.00"
-6.00"
4.75" 2.37"
4.75" 2.37"
6.00" 3.00"
--
Aluminum
"D"
0
BUS BAR DRILLING DETAIL
FLANGE END DRILLING DETAIL
Cont.
Current
Rating
1.75" (Typ,)
Wide Bar)
·
" H"
HJII
"K"
5.81"
5.81"
5.81"
5.81"
5.81"
5.87"
2.87"
2.87"
2.87"
2.97"
2.87"
5.81"
\"entilated
"I"
"J"
"K"
6.00" 5.81" 2.87"
-6.00" 5.81" 2.87"
-6.00" 5.81" 2.87"
-6.00" 5.81" 2.87"
4.75" 2.37" 5.81" 2.87"
4.75" 2.37" 5.81" 2.87"
--
Cont.
Current
Rating
Voltage: 600 Y/15000 V
Bus Bars
Per Phase
A (I)
!600 A (I)
2000 A (2)
!200
.37" X 4"
.62" X 4"
.50" X 4"
2500 A (2) .62" X 4"
3000 A (2) .62" X 6"
4000 A
Cont.
Current
Rating
Voltage:
A (!)
A (I)
A (2)
A (2)
3000 A (2)
4000 A (2)
!200
1600
2000
2500
Cont.
Current
Rating
.37" X 4"
.50'' X 4"
.37" X 4"
.50'' X 4"
.62" X 4"
.62" X 6"
1200 A
1600 A
2000 A
2500 A
3000 A
4000 A
"Bu
7.12"
6.87"
7.00"
6.87"
8.87"
0.75"
0.75"
0.75"
0.75"
0.75"
Bus Bars
Per Phase
"8"
(I) .25" X 4"
(I) .25" X 4"
(I) .37" X 4"
(!) .62" X 4"
(2) .37" X 4"
(2) .62" X 4"
''D"
U E"
"F"
"G"
1.37"
1.37"
1.37"
14"
14"
14"
14"
14"
27"
27"
27"
27"
33"
10"
10"
10"
10"
10"
23"
23"
23"
23"
29"
7.12"
7.00"
7.12"
7.00"
6.87"
8.87"
0.75"
0 .75"
0.75"
0 .75"
0.75"
0.75"
"C"
---
1.37"
1.37"
1.37"
1.37"
Housing:
Aluminum
"D"
"E"
"F"
''G "
14"
14"
14"
14"
14"
16"
27"
27"
27"
27"
27"
33"
10''
10''
10"
10"
10"
12"
23"
23"
23"
23"
23"
29"
" A"
"B "
7.25"
7.12"
6.87"
7.00''
6.87"
8.87"
0.75"
0.75"
0.75"
0.75"
0.75"
0.75"
"A"
"8"
7.25"
7.25"
7.12"
6.87"
7.12"
6.87"
0.75"
0.75"
0.75"
0.75"
0.75"
0.75"
" C"
----
1.37"
1.37"
1.37"
"D"
UE''
"F"
"G"
14"
14"
14"
14"
16"
20''
27"
27"
27"
27"
27"
33"
10"
10"
10''
10"
12"
16"
23"
23"
23"
23"
23"
29"
Conductor:
"C"
-----
1.37"
1.37"
Aluminum
Housing:
Totally Enclosed
•
"I"
'' "
J
6.00"
6.00"
6.00"
6.00"
6.00"
5.00"
5.00"
5.00"
5.00"
"H"
Aluminum
"H "
6.00"
-6.00''
-6.00"
-6.00''
-6.00"
4.75" 2.37"
''H"
------
SQURRE D COMPRNV
"J"'
"K"
5.00''
5.00"
5.00"
5.00"
5.00''
5.18"
2.50"
2.50"
2.'50"
2.50''
2.50"
5.12"
Totally Enclosed
"I"
6.00''
-6.00"
-6.00''
-6.00"
4.75" 2.37"
6.00" 3.00"
--
Aluminum
"D"
" E"
"F"
"G"
"H''
14"
14''
14"
14"
14"
16"
27"
27"
27"
27"
27"
27"
10"
10"
10"
10''
10"
12"
23"
23"
23"
23"
23"
23"
6.00"
-6.00"
-6.00"
-6.00''
-6.00''
4.75" 2.37"
"I"
--
_______
"J"
"K"
5.00''
5.00''
5.00''
5.00''
5.00"
5.18"
2.50''
2.50''
2.50''
2.50''
2.50''
5.12"
Ventilated
·
p"':�· [0
8
Ventilated
·
.....
·
"K"
2. 50"
2.50"
2.50"
2.50''
5.18" 5.12"
--
Housing: Aluminum
Conductor: Aluminum
Voltage: 600 V/15000 v
Bus Bars
Per Phase
" C"
Conductor:
"A"
Voltage: 600 Y/15000 V
1200 A (I) .25" X 4"
1600 A (I) .37" X 4"
2000 A (I) .62" X 4"
2500 A (2) .50'' X 4"
3000 A (2) .62" X 4"
4000 A (2) .62" X 6"
Cont.
Current
Rating
"A"
600 Y/15000 v
Bus Bars
Per Phase
Housing: Aluminum
Conductor: Aluminum
"J"'
"K"
5.00"
5.00"
5.00''
5.00"
5.00''
5.00''
2.50"
2.50"
2.50"
2.50"
2. 50''
2.50"
IDI
APRIL, 1987
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WALL ENTRANCE SEAL
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(Wall
Opening)
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(Wall Opening)
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POWER ZONE METAL-ENCLOSED BUS
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4 Mig. Holes-.62" Dia.
(Bolts By Purchaser)
WAL L THROAT
WALL F LANGE
600V · SkY
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VOLTAGE:
Current Rating
Alum.
Copper
1200-2500
1200-2500
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A
B
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F
E
-
18
36
17.37
35.37
2.66
5.33
5.66
5
18
42
17.37
41.37
2.66
5.33
6.66
5
-
3000
18
36
17.37
35.37
2.66
5.33
5.66
5
-
4000
22
42
21.37
41.37
5
5
6.66
6
H
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c
D
E
F
18
36
17.37
35.37
2.66
5.33
5.66
5
18
42
17.37
41.37
2.66
5.33
6.66
5
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3000
VOLTAGE:
1SkV
Current Rating
Alum.
Copper
1200-2500
1200-2500
3000
-
WALL THROAT & PLATE ASSEMBLY
*Variable to suit type
of bldg. wall
B
3000
18
36
17.37
35.37
2.66
5.33
5.66
5
4000
22
42
21.37
41.37
5
5
6.66
6
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A
;- Fiber
,1
Glass
Seal Plate
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. Factory Caulked
--....-...;:r
.
Bus
/1;;;.-.,--- - Bar
Tubing
600V, 5kV SEAL ASSEMBLY DETAIL
15kV SEAL ASSEMBLY DETAIL
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A wall entrance seal is used to prevent smoke, vapor, air
and gases from passing from one room to another or from
outdoor to indoor. It consists of a wall throat which is
bolted to the wall and one wall flange which is an integral
[g)
______ _
part of the bus and is bolted to the wall throat. This
throat/flange combination supports the bus at the wall
penetration. The internal seal has a 1h hour fire rating.
Higher ratings are available- consult factory.
SQUARED COMPANY
-----
9
POWER ZONE METAL-ENCLOSED BUS
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APRIL, 1987
MINIMUM CONSTRUCTION DIMENSIONS
15000V
E
"
c
·e
"
<
(;;
c.
c.
0
()
Totally Enclosed
H
Ventilated
H
w
w
Ventilated
w
H
H
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1200 A
25.50"
10.00"
25.50"
10.00"
29.50"
10.00"
29.50"
10.00"
1600 A
25.50"
10.00"
25.50"
10.00"
29.50"
10.00"
29.50"
10.00"
2000 A
25.50"
10.00"
25.50"
10.00"
29.50"
12.00"
29.50"
12.00"
2500 A
25.50"
10.00"
25.50"
10.00"
29.50"
12.00"
29.50"
12.00"
3000 A
31.50"
10.00"
25.50"
10.00"
35.50"
12.00"
29.50"
12.00"
31.50"
12.00"
35.50"
12.00"
1200 A
25.50"
10.00"
25.50"
10.00"
29.50"
10.00"
29.50"
10.00"
1600 A
25.50"
10.00"
25.50"
10.00"
29.50"
10.00"
29.50"
10.00"
2000 A
25.50"
10.00"
25.50"
10.00"
29.50"
10.00"
29.50"
10.00"
10.00''
- -
4000 A
- -
2500 A
25.50"
10.00"
25.50"
10.00"
29.50''
12.00''
29.50"
3000 A
25.50"
12.00"
25.50"
10.00"
29.50''
12.00''
29.50''
12.00"
4000 A
31.50"
16.00''
25.50"
12.00"
35.50''
16.00''
29.50''
12.00''
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H
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H + 2
Min.
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6" + H Min.
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Cont.
Cur.
Rating
Totally Enclosed
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600V/5000V
2
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(f
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H+W+6
2
Min.
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SQURAE D CDMPRNV
______
IDI
APRIL, 1987
NONSEGREGATED PHASE BUS SPECIFICATIONS
1.0 General:
2.0 Standards and Codes:
2.1.1 National Electrical Manufacturer Associa­
tion (NEMA)
2.1.2 American National Standards Institute
(ANSI - C37.20d, 1978)
2.1.3 National Electric Code
No. 70)
(NEC)
(NFPA
2.2 It shall be the manufacturer's responsibility to be,
or to become, knowledgeable of the requirements
of these Standards and Codes. Any changes or
alterations to the equipment to make it meet
Standards and Codes requirements shall be at the
expense of the Manufacturer.
3.0 Basic Construction:
3.1 Housing
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3.1.1 The bus duct shall be nonlouvered outdoors,
and shall be (louvered) (nonlouvered) in­
doors. Housing and accessory flanges, ter­
minal enclosures, etc., shall be primed and
painted (steel) (corrosion resistant alumi­
num) construction. All outdoor hardware
shall be 316 stainless steel.
.E
Indoor hardware (unless in corrosive en­
vironment) shall be manufacturer's stand­
ard.
3.1.2 Steel housings shall have 14 gauge sides and
covers, and 11 gauge end flanges. Alumi­
num housings shall be nominal 1/s" thick­
ness material minimum throughout.
3.1.3 Totally enclosed, nonlouvered housings shall
be fitted with screened breathers and space
heaters in sufficient quantity and rating to
minimize condensation. Space heaters shall
be completely factory wired with no exposed
wiring inside the bus housing.Heaters shall
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3. 1.4 All housing and flange gasketing shall be
closed-cell neoprene rubber, or other non­
corrosive material, and shall be completely
concealed for protection against deteriora­
tion.
3. 1. 5 The temperature rise at any point on the
housing shall not exceed 3o•c above an
ambient temperature of 40·c.
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2.1 The assemblies shall be constructed, wired and
tested in accordance with all applicable sections
of the latest listed standards and codes.
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1.2 This specification covers only the general require­
ments of the bus duct assemblies. The specific re­
quirements of each assembly (plan, arrangement,
components, etc.) will be shown on drawings pro­
vided by the Purchaser. These drawings will form
the basis for manufacturing and installation draw­
ings developed by the Vendor.
be (thermostatically controlled) (manually
controlled). Heater wiring shall be ( termi­
nated in an octagonal box at designated end
of bus housing) (provided with 3'-0" coiled
extension for connection into Purchaser's
switchgear power source). Heaters shall be
rated at 240 Volts and operated at 120 Volts
( 1/z voltage) to maintain low heater surface
temperature, and shall be designed for easy
removal without requiring opening of the
bus housing.
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1.1 This specification describes the electrical and me­
chanical requirements for metal-enclosed, 600V
through 15kV class, 60Hz. feeder bus. The speci­
fication can be readily adapted to 25.8kV and
38kV applications. The bus system described is to
be suitable for indoor and outdoor installations,
with nominal current ratings maintained in am­
bient temperatures to 4o·c.
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POWER ZONE METAL-ENCLOSED BUS
_______
3.1.6 A fire resistant divider or barrier shall be
provided at all points where the bus duct
extends through building walls.
3.2 Phase Bus Bars
3.2.1 Phase bus bars shall be of the nonsegrated
phase type, completely metal-enclosed.
3.2.2 Bus bars shall be full round edge rectangular
(98% lACS copper) (57% lACS alumi­
num) of sufficient cross-section to assure
full current rating without exceeding a hot
spot temperature rise of 65 ·c in an ambient
air temperature of 4o·c. Joints between bus
bar sections and at terminal connections
shall be designed for a maximum rise of
6s·c in a 4o·c ambient.
3.2.3 Phase bus bars shall be mounted and se­
cured against movement during short-circuit
in tracking-resistant, molded, glass-reinforced
polyester blocks, spaced along the bus run
as required to meet the short-circuit current
rating. The support blocks shall be ribbed
to provide long creepage paths and fitted
with corona suppressors, consisting of sili­
cone rubber inserts between the insulated
bus bars and support blocks.
3.2.4 Phase bus bars, at 5kV class and above,
shall be insulated with extruded Noryl®
tubing, rated for continuous operation at
13o·c.
3.2.5 Contact surfaces of copper bus bars shall be
silver plated electrically by tank or brush
method. Contact surfaces of aluminum bus
bars shall be electro-tinned over bronze
strike by the ALSTAN 80-A process. All
bus bar connections shall be bolted. Bolts
shall pass through the bus bar conductors,
SQURAE D COMPANY
11
------
NONSEGREGATED PHASE BUS SPECIFICATIONS (Con'd.)
applicable switchgear and transformer draw­
ings for matching and coordination require­
ments.
3.3 Ratings:
3.3.1 The maximum hot-spot temperature rise at
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any point in the bus duct, at continuous
rated load, shall not exceed 65°C above an
ambient temperature of 40°C.
3.3.2 The ratings of the bus duct shall be:
Voltage Class
Volts
Nominal Voltage Rating
Volts
_____
Continuous Current Rating
Amperes
_____
Short Circuit Rating:
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A ground bus (shall) (shall not) be furnished
which will electrically connect together all
equipment connected to the bus duct. If the
bus duct enclosure is so constructed and
connected that it provides a continuous path
for ground current, it may serve as the
ground bus. If the enclosure is used as the
ground bus, a tooth type Jock washer shall
be furnished under each bolt head and each
nut at connections between sections of bus
duct. If the enclosure is not so constructed,
the bus duct shall be furnished with a
(aluminum) (copper) ground bar (inside)
(outside) the housing. The ground bus shall
have suitable terminating pads for Pur­
chaser's connections to station ground
system.
3.2.7 Purchaser will provide Manufacturer with
an
and shall be capable of being properly tor­
qued and locked in place, to provide and
maintain full and uniform pressure under all
operating conditions. (Torque requirements
in ft.-lbs. shall be furnished by Manufac­
turer.) Temperature rise of bus bar joint
shall not exceed bus bar rise by more than
soc and in no case shall such bus bar joint
temperature rise exceed 65°C.
APRIL, 1987
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POWER ZONE METAL-ENCLOSED BUS
Momentary Current Amps
rms asym.
_____
Short Time Current Amps
rms sym. ( Not less than short
time ratings of protective
devices. )
_____
3.2.6 Flexible connections shall be provided for
Basic Insulation Level (BIL)
kV
_____
3.4 Supports:
Bus duct supports shall be (indoor trapeze type)
(outdoor column type with base plates for attach­
ing to Purchaser's foundations) (knee-brace type
for wall mounting) .
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.E
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connecting bus to porcelain apparatus bush­
ings. All necessary adapter bars and spacers,
bolting hardware and insulating materials,
for connection to transformer or switchgear
terminals, shall be provided and the proper
coordination of connections between bus
and terminal equipment shall be the respon­
sibility of the bus Manufacturer.
""'�'{o
1"�
-------
SQUARED C:DMPRNV
______
IDI
APRIL, 1987
A. General Requirements
364-1.
Scope. This article covers service-entrance, feeder, and branch­
circuit busways and associated fittings.
364-2. Definition. For the purpose of this article a busway is con­
sidered to be a grounded metal enclosure containing factory mounted,
bare or insulated conductors which are usually copper or aluminum
bars, rods, or tubes.
(FPN): For cablebus, refer to Article 365.
364-3. Other Articles. Installations of busways shall comply with the
applicable provisions of Article 300. (Wiring Methods.)
Use.
(a) Use Permitted. Busways shall be installed only where located
in the open and are visible.
Exception: Busways shall be permitted to be installed behind panels
if means of access are provided and if all the following conditions
are met.
a. No overcurrent devices are installed on the busway other than
for an individual fixture.
c. The busway is totally enclosed, nonventilating type.
d. Busway is so installed that the joints between sections and
fittings are accessible for maintenance purposes.
(b) Use Prohibited. Busways shall not be installed: (I) where sub­
ject to severe physical damage or corrosive vapors; (2) in hoistways;
(3) in any hazardous (classified) location, unless specifically approved
for such use [see Section 501-4(b)] (Class I, Division 2); nor (4)
outdoors or in wet or damp locations unless identified for such use.
364-5. Support. Busways shall be securely supported at intervals not
exceeding 5 feet (1.52 m) unless otherwise designed and marked.
364-6.
Through Walls and Floors. It shall be permissible to extend
unbroken lengths of busway through dry walls. It shall be permissible
to extend busways vertically through dry floors if totally enclosed
(unventilated) where passing through and for a minimum distance of
6 feet (1.83 m) above the floor to provide adequate protection from
physical damage.
364-7.
Dead Ends.
A dead end of a busway shall be closed.
364-9. Overcurrent Protection. Overcurrent protection shall be pro­
vided in accordance with Sections 364-10 through 364-14.
364-10.
Rating of Overcurrent Protection- *Feeders and Subfeed­
ers. Where the allowable current rating of the busway does not cor­
respond to a standard rating of the overcurrent device, the next higher
rating shall be permitted.
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364-15. Marking. Busways shall be marked with the voltage and
current rating for which they are designed, and with the manufac­
turer's name or trademark in such manner as to be visible after
installation.
B. Requirements for Over
364-21.
Metal-enclosed buses shall be constructed and tested in accordance
with ANSI C37.20-1974, Switchgear Assemblies (including metal fan).
364-22.
Grounding.
Metal-enclosed bus shall be grounded in ac­
cordance with Article 250.
364-23.
Adjacent and Supporting Structures. Metal-enclosed busways
shall be installed so that temperature rise from induced circulating
currents in any adjacent metallic parts will not be hazardous to per­
sonnel or constitute a fire hazard.
364-24. Neutral. Neutral bus, where required, shall be sized to carry
all neutral load current, including harmonic currents, and shall have
adequate momentary and short-circuit rating consistent with system
requirements.
364-25. Barriers and Seals. Bus runs having sections located both
inside and outside of buildings shall have a vapor seal at the building
wall to prevent interchange of air between indoor and outdoor sec­
tions.
Exception: Vapor seals not required in forced-cooled bus. Fire gar­
riers shall be provided where fire walls, floors, or ceilings are pene­
trated.
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b. The space behind the access panels is not used for air-handling
purposes.
manent nameplate on which the following information shall be pro­
vided; (1) rated voltage; (2) rated continuous current; if bus is forced­
cooled, both the normal forced-cooled rating and the self-cooled (not
forced-cooled) rating for the same temperature rise shall be given;
(3) rated frequency; (4) rated impulse withstand voltage; (5) rated
60-Hz withstand voltage (dry); (6) rated momentary current; and
(7) manufacturer's name or trademark.
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364- BUSWAYS
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NEC
ARTICLE
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STANDARDS AND CODES
364.4
II
POWER ZONE METAL-ENCLOSED BUS
Identification.
600
Volts, Nominal
Each bus run shall be provided with a per-
364-26. Drain Facilities. Drain plugs, filter drains, or similar meth­
ods shall be provided to remove condensed moisture from low points
in bus run.
364-27. Ventilated Bus Enclosures. Ventilated bus enclosures shall
be installed in accordance with Article 710, Part D, unless designed
so that foreign objects inserted through any opening will be deflected
from energized parts.
364-28. Terminations and Connections. Where bus enclosures termi­
nate at machines cooled by flammable gas, seal-off bushings, baffles,
or other means shall be provided to prevent accumulation of flam­
mable gas in the bus enclosures.
Flexible or expansion connections shall be provided in long, straight
runs of bus to allow for temperature expansion or contraction, or
where the bus run crosses building vibration insulation joints.
All conductor termination and connection hardware shall be acces­
sible for installation, connection, and maintenance.
364-29. Switches. Switching devices or disconnecting links provided in
the bus run shall have the same momentary rating as the bus. Dis­
connecting links shall be plainly marked to be removable only when
bus is de-energized. Switching devices which are not load break shall
be interlocked to prevent operation under load, and disconnecting
link enclosures shall be interlocked to prevent access to energized
parts.
364-30. Low-Voltage Wiring. Secondary control devices and wiring
which are provided as part of the metal-enclosed bus run shall be
insulated by fire-retardant barriers from all primary circuit elements
with the exception of short lengths of wire, such as at instrument
transformer terminals.
Limitations of Hottest Spot Temperature
Rise Over Ambient Temperature 40°C
.E
ANSI C37.20
Metal-Enclosed Bus - Voltage and Insulation Levels
Voltage
(kV rms)
(Nominal)
(Rated Maximum)
0.6
0.635
Insulation Level (kV)
Power Frequency Withstand (rms)
(Dry 1
Minute)
Impulse
Withstanding
2.2
-
4.76
19.0
60
15.00
36 . 0
95
14.4
15.50
50.0
110
34.5
38.00
80.0
150
4.16
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13.8
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NOTES:
1. Values tabulated below are for factory test. When field tests are performed
these values should be reduced by 25%.
[g)
______
Limit of Hottest
Spot Temperature
Rise
Limit of Hottest
Spot Total
Temperature
Bus conductor silver plated
(or tin plated) bus joint.
65'C
105'C
Enclosure and support structure,
accessible to personnel.
Part of Metal-Enclosed
Bus, or Application
30'C
70'C
Enclosure and support structure,
inaccessible to personnel.
70'C
110'C
*Emergency overload.
90'C
130'C
Short circuit, short time heating
(3 seconds and below).
N/ A
250'C
*Emergency overload operations not to exceed 100 hours m twelve consecut1ve
months or 500 hours in the lifetime of the bus duct system.
SQUARED CDMPANY
13
----
HEATER DETAIL AND WIRING DIAGRAM
Self Tapping
Screw
Enclosure
Gover
Plug Spade
Lug
%"
��::::lEI:::
Anti-Short
Bushing
.
I f--1
I
A�'%?,X.�
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I
�::=-,'1:1
::::c::ct:tu'Cl�I�!:.C
Tape
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H e a t er
Encl o s u re
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APRIL, 1987
POWER ZONE METAL-ENCLOSED BUS
90° BX
Tubular
Heater
Element
Fitting (Socket)
/
Armored Cable
BX Fitting Cover
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Heater Cable Connection
120V Circuit Only
Heat Shield
Heater Cable
Retainer Clip
...-----,.
rr
.....---,
,....-...
-
]))1[[
lll){f
�
�
Ht
H5
H2
H6
H3
H7
H4
H8
H2
Each heater generates
125 watts regardless
of series parallel
wiring.
H1
H3
'H2
H4
t:::l
�
H5
..----,
,,....--..
I IIIII
1111 !rr
l�l
5
�
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5
HIill[
lijj
H4
�
H6
..--.
---ruJllli
�
H7
Heater
Terminal
Strip
(f .-
d
____...
=-
I Ill( Ill
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Ht
1
H3
H5
H7
H6
H8
---.
,..--._
I
1111r,-
IIIII fl
"---i
�
�
H6
H5
H4
..----.,
�
I; llllll
lllllffrr==r
�
�
H7
240 V. Source
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240 V.Source
...----,
J240 VOLTS!
II( Ill
.r-----
I
.---
�
il( II
H4
H6
H5
H7
-
(SCHEMATI
=
I
If II
[�
H5
H3
H3
�
Heater
_JUnction
Box
1 Amp. per 2 Htr.
� = ifCJ
Each heater generates ..-----.125 watts regardless
H1
H2
of series parallel
wiring.
Heater
Junction
Box
1480 VOLTS!
Heater
Terminal
Strip
[� [� [�
H2
�
480 V. Source
(SCHEMATIC)
--.
=��F
�
1 Amp. per 4 Htr.
F 9)/1;::
H1
�
480 V. Source
(SCHEMATIC)
Ed
]_i'uJirr
�
H3
------
'�
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Each heater generates
125 watts regardless
of series parallel
wiring.
lil)((rr
�
�
H2
H1
-
H8
120 V. Source
1 Amp. per Htr.
.__,. ....___.,
.�
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ll( II
,---..
,..---,
I ill(Ill
�
-
I II( rr
� [� J�
[
Heater
Terminal
Strip
1�
Heater
Junction
Box
120 V. Source
I_120VOLT!!J
v�''�..,' fo
14 --------= SQUARED CDMPRNY
______
IDI
APRIL, 1987
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POWER ZONE METAL-ENCLOSED BUS
CABLE BUS
Indoor
Outdoor
Horizontal
Elbow
Wall Throat
Wall Flange
Wall Seal
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Entrance Bushings
Switchgear
Cubicle
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Termination Box
3
4
5
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2
To Switchgear
METAL-ENCLOSED LOW AND
MEDIUM VOLTAGE CABLE BUS
PRODUCT DESCRIPTION
1 . Supplied with insulated
copper or aluminum cable
conductors as required, with or without neutral and
with insulation and jacketing material per purchaser's
requirements. Buses with 2 or more cables per phase
are interleaved for best current balance and lowest
impedance. See below for splicing and terminating
details.
2. Cable support blocks are clear, hard maple, treated and
painted with a non-toxic preservative.
3. Block sections are bolted together with non-magnetic
through bolts to provide short-circuit strength.
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4. Cable blocks and support brackets are located every
24" to 36" along the bus to provide the required short
circuit strength.
.E
TYPICAL CABLE SPLICING DETAILS
Jacketing Tape
JL
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0 • 5,000 Volt Splice Non-Shielded Cable
Stress Cone
Insulating Tape
Both Cable Ends
[g)
•
a. Factory assembled and conductored bus sections with
factory made terminations and partially made splices.
b. Factory assembled and conductored bus sections with
all splicing and terminating work done by purchaser.
Factory fabricated bus housing sections arranged for
field installation and terminating of the cables.
TYPICAL CABLE TERMINATION DETAILS
Splice
"'t " � �'"""J
5,000
POWERZONE cable bus systems are available in three
forms:
c.
5. Bus housing is fabricated of extruded aluminum side
Insulating
members (corrosion resistant alloy 6063-T6) with
formed sheet aluminum covers. Outdoor bus has lou­
vered side members and bottom covers with solid top
covers. Indoor bus has louvered top and bottom covers.
Non-ventilated bus designs can be supplied if required:
current capacity is approximately 60% of the capacity
of the same cables in standard ventilated housing.
Primed and painted sheet steel housings available thru
2500A.
Tinned
Ground Braid
I
23,000 Volt Splice Shielded Cable
______
SQUARED C:DMPANY
15
---
CABLE BUS SPECIFICATIONS
corrosive material and shall be completely
concealed for protection against deteriora­
1.0 General:
1.1 This specification describes the electrical and me­
chanical requirements for metal-enclosed, low and
with
nominal current ratings
1.2 The bus shall be for indoor or outdoor applica­
tion as designated in the Purchaser's specifications
and shall include all necessary equipment connec­
tion flanges, wall entrance seals, transformer or
equipment taps, elbows, offsets, cable splicing and
terminating materials, terminal connectors, bush­
ing stud connectors, and other miscellaneous parts
required to make a complete coordinated bus in­
stallation. Drawings shall be supplied with each
run of bus arid each bus section identified on the
installation drawings. Complete bills of material
are supplied, keyed to the installation drawings,
covering all materials supplied.
3.1.5 A fire and weather resistant divider or bar­
rier shall be provided at all points where the
bus duct extends through building walls.
3.2 Phase Conductors
3.2.1 Phase conductors shall be of non-segregated
phase
quirements, of sufficient cross-section to as­
sure full current rating without exceeding a
hot-spot temperature rise of 50oC in an am­
bient air
temperature
of
40°C. Insulated
cables are to be correctly interleaved to as­
sure balanced current divisions between
phase cables and to give minimum cable
temperature rise.
of sections shipped to a minimum.
3 .2.3 Phase conductors (and neutral conductors if
an ungrounded neutral is required) shall be
of the latest listed standards and codes.
mounted and secured against short circuit
forces in clear hard maple support blocks,
2.1.1 National Electrical Manufacturers Associa­
treated and painted with a non-toxic wood
preservative.
tion (NEMA)
2.1.2 American N a tiona! Standards Institute
(ANSI - C37.20a)
2.1.3 National Electric Code (NEC) (NFPA No.
70)
3.0 Basic Construction:
3.2.4 Contact surfaces of cable terminals shall be
tin plated electrically by the ALSTAN 80-A
process. Any bus bar connections required
shall be bolted, accomplished by bolts pass­
ing through the bus bar conductors, capable
of being properly torqued and locked in
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3.1 Housing
place to provide and maintain full and uni­
form pressure under all operating conditions.
(Torque requirements in ft.-lbs. shall be fur­
3.1.1 The bus duct shall be (louvered) (non­
louvered) outdoors, and shall be (louvered)
(non-louvered) indoors. Housing and acces­
nished by Manufacturer.) Temperature rise
of bus bar joint shall not exceed cable tem­
perature and in no case shall such bus bar
sory flanges, terminal enclosures, etc. shall
be of primed and painted (steel) (corrosion
.E
resistant aluminum)
construction. All out­
door hardware shall be stainless steel.
joint temperature rise exceed 50'C.
3.2.5 All transition parts for connection to trans­
former or switchgear terminals shall be pro­
Indoor hardware (unless in corrosive envir­
vided and the proper coordination of con­
onment) shall be manufacturer's standard.
nections between bus and terminal equip­
ment shall be the responsibility of the bus
3.1.2 Steel housings shall have 14 gauge sides and
Manufacturer.
covers, and 11 gauge end flanges. Aluminum
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bus housings shall be of nominal Ys" thick­
ness material minimum throughout.
3.2.6 Purchaser will provide Manufacturer with
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3.1.3 All housing and flange gasketing shall be of
16
metal-enclosed in
(aluminum) cables, insulated, shielded and
jacketed in accordance with Purchaser's re­
practical, elbows, offsets and bends will be factory
assembled into a bus section to reduce the number
2.1 The assemblies shall be constructed, wired and
tested in accordance with all applicable sections
completely
(non-ventilated) enclosure.
3.2.2 Phase conductors shall be flexible (copper)
(longer for special applications) with each piece
sized to fit the installation conditions. Wherever
2.0 Standards and Codes:
type,
(ventilated)
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The bus will be supplied in lengths up to 30 feet
3 .1.4 The temperature rise at any point on the
housing shall not exceed 40oC above an am­
bient temperature of 40°C.
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door applications
maintained in ambient temperatures to 40°C.
tion.
an
medium voltage (thru 69kV) feeder bus. The bus
system described is to be suitable for indoor or out­
APRIL, 1987
.c
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Ill
POWER-ZONE METAL-ENCLOSED BUS
closed-cell neoprene rubber of other non-
-------
SQUARED C:DMPRNY
applicable switchgear and transformer draw­
ings for matching and coordination require­
ments.
______
IDI
APRIL, 1987
CABLE BUS SPECIFICATIONS (Con'd.)
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POWER-ZONE METAL-ENCLOSED BUS
Short Circuit Rating
3.3 Ratings
Momentary Current Amps
3.3.1 The maximum hot-spot temperature rise at
any point in the bus duct, at continuous
rated load shall not exceed SOoC above an
______
Short Time Current Amps
ambient temperature of 40°C.
____
3.3.2 The ratings of the bus shall be:
____
Volts
___
Volts
Nominal Voltage
Rating
Continuous Current
Rating
rms symm.
Basic Impulse Insulation
Level (BIL) ____
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Voltage Class
rms assym.
3.4 Supports
Bus duct supports shall be (indoor trapeze type)
_____
(outdoor column type with base plates for attach­
ing to Purchaser's foundations) (knee-brace type
Hertz
for wall mounting).
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.E
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Frequency
Amperes
IDI
----
SQUARED CDMPANY
----
17
CABLE BUS TECHNICAL INFORMATION
COPPER 600 VOLTS
Conductors
ALUMINUM 600 VOLTS
Three Phase-3W
Conductors
Nominal
Amp.
Rating (a)
No.
Per
Phase
400
1
600
1
800
1
750
820
6Vz" x 14%"
16
1000
1
1000
1040
6Vz" X 14Yz"
19
1200
2
500
1250
8112"x12Yz"
19
1200
2
1600
2
750
1620
81/2"x 14Yz"
25
1600
2
1800
2
1000
1870
BVz"x 14%"
30
2000
3
750
2370
BVz"x23Vz"
37
2500
3
1000
2740
8Vz" x23Yz"
43
3000
4
750
3060
8V2"x23%"
45
Ampacity
at 40' C
Ambient
Overall
Dimensions
H'' X W' (b)
350
490
6V2"x12Vz"
500
620
61/2"x 12Yz"
Three Ph ase-3W
Nominal
Amp.
Rating (a)
No.
Per
Phase
11
400
1
500
480
6Vz"x12Yz"
9
13
600
1
750
625
6Vz"x 14Yz"
10
800
1
1000
825
6Vz"x14Vz"
11
1000
2
500
1025
8¥2"x12Vz"
11
WI./
Ft.
kcmil
Ampacity
at 40' C
Ambient
Overall
Dimensions
H"xW' (b)
3500
4
1000
3640
BVz" x 231fz"
55
3500
e
4000
6
750
4300
121Jz" x23Yz"
64
4000
6
5000
6
1000
5160
12V2" x23%"
so
5000
6
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kcmil
APRIL, 1987
.c
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POWER ZONE METAL-ENCLOSED BUS
6000
6
1250
6200
14V2" X 25V2"
101
6000
6
3
3
2500
4
3000
4
Conductors
400
600
14
16
750
1870
8Vz"x 23Vz"
21
1000
2200
8Vz" x23112"
24
750
2530
8Vz" x 23Vz"
24
1000
3020
8¥2"x 23Vz"
28
750
3610
12Vz"x 23Vz"
33
1000
4350
12V2" X 23V2"
39
1250
5100
14 Vz"x 25Vz"
49
2000
6340
16%" X 29'12"
69
Conductors
Three Phase-3W
Nominal
Amp.
Rating (a)
No.
Per
Phase
Three Phase-3W
kcmil
Ampacity
at 40° C
Ambient
Overall
Dimensions
H"x W" (b)
kcmil
Ampacity
at 40' C
Ambient
1
500
475
6Vz" x 14¥2"
11
400
1
350
485
6Y," X 14%"
13
1
750
630
6Vz" x161/z"
14
600
1
500
615
6Vz"x14Vz"
15
Overall
Dimensions
H" x W" (b)
WI./
Ft.
800
1
1000
815
6Vz"x 18Vz"
16
1000
2
500
1015
BVz"x 14%"
15
1200
2
750
1230
81Jz"x 16Y2"
20
1600
2
1250
1700
10V2" X 18V2"
26
1800
3
750
1845
BV2" X 25V."
28
2000
3
1000
2140
101/2" X 281/2"
34
25{)0
4
750
2510
BVz" x25Vz"
33
3000
4
1000
3020
10Yz"x 29Yz"
41
3500
6
750
3560
14Yz" x25Yz"
48
4000
6
1000
4275
16V2" X 29V2"
58
5000
6
1250
5200
16V2" X 30%"
6000
6
2000
6200
181/z" x 34 Yz"
No.
Per
Phase
800
1
750
815
6V2' x 16%"
19
1
1000
1050
6Vz"x 18Vz"
22
1200
2
500
1235
8Vz" x14Vz"
23
1600
2
750
1630
8Vz" x16Vz"
30
1800
2
1000
1850
10Vz"x 18¥2"
38
2000
3
750
2240
8¥2"x 25Vz"
43
2500
3
1000
2700
10Vz" x 28¥2"
55
3000
4
750
3050
8Vz"x 25Vz"
53
3500
4
1000
3685
1OV." X 29%"
68
4000
6
750
4250
14Vz" x 25Vz"
78
65
5000
6
1000
5120
16Vz" x 29Vz"
99
90
6000
6
1250
6150
16¥2" x 30Vz"
116
15,000 VOLTS COPPER
kcmil
Overall
Dimensions
H"xW'(b)
Three Ph ase-3W
Conductors
Three Phase-3W
Ampacity
at 40' C
Ambient
Wt./
Ft.
1000
15,000 VOLTS ALUMINUM
Conductors
Nominal
Amp.
Rating (a)
8¥2"x14Vz"
8Vz" x14Vz"
tri
ca
lP
ar
tM
No.
Per
Phase
1270
1615
5,000 VOP..TS COPPER
5,000 VOLTS ALUMINUM
Nominal
Amp.
Rating (a)
750
1000
an
1800
2000
Wt.l
Ft.
Wt.l
Ft.
Nominal
Amp.
Rating (a)
No.
Per
Phase
kcmil
Ampacity
at 40' C
Ambient
Overall
Dimensions
H'' X W" (b)
Wt./
Ft.
1
500
460
6Vz"x15Yz"
13
400
1
35{)
480
6Vz" x 14Vz"
14
1
750
618
6Vz" X 16Yz"
14
600
1
500
610
6V2" X 15V2"
16
1000
800
6Vz"x18¥2"
16
800
1
750
800
61;2" x 16Vz"
21
500
1000
BV2" X 15V."
1000
1
1000
1010
6Vz" x 17Vz"
23
750
1210
BVz"x 16Yz"
20
1200
2
500
1220
BV." X 15V2"
24
1250
1670
10V2" X 19V2"
29
1600
2
750
1600
8Vz" x16Vz"
31
1800
2
1000
1820
10Vz" X 18Vz"
39
46
800
1
1000
2
1200
2
1600
2
1800
3
2000
3
3000
3500
4000
5000
750
1813
BVz"x 26Vz"
29
2100
1OYz"x 29Vz"
37
4
1000
2805
101Jz"x 30Vz"
44
4
1250
3200
10Yz"x 32Vz"
51
3
750
2200
8Vz" x26Vz"
3
1000
2650
!OV2"x 29V2'
57
3000
4
750
3000
8Vz"x 27%"
57
3500
4
1000
3620
tOY," X 30%"
71
4000
6
750
4170
14V2" X 26V2"
83
6
750
3500
14Yz"x 261Jz"
50
1000
4200
16Yz"x 30Yz"
63
6
1500
5090
16Vz"x 33Vz"
77
5000
6
1000
5020
16Vz" X 30Vz"
104
6
2000
6100
18V2"x 35V."
92
6000
6
1250
6020
16V2" X 32V2"
123
(a) Ampere ratings are based on 3 phase temperature rise
tests made to establish conductor arrangement for
minimum temperature rise. The ratings meet the max­
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2000
2500
6
w
6000
18
1000
.E
2500
lec
400
600
imum allowable conductor temperature per IPCEA
std:, with housing rise limited to 30oC per USAS­
C37.20-1974.
Buses with lower conductor housing
temperature rises can be provided.
(b) Minimum cable spacing is one cable diameter.
v�",';_'to
18
-------
SQUARE D CCMPANV
______
IDI
APRIL, 1987
.c
om
POWER ZONE METAL-ENCLOSED BUS
PROJECT CHECK LIST
Project Name:
(H) Housing Finish:
Location:
(1)__
Quotation Number:
(2) __
Required Performance Dates:
(3)
Record Drawings:
Shipment:
---�-----
(A) Voltage Class:
(2)
5kV
(3)
15kV
(4)
(I)
_____
(2)
__
Insulated
(C) Current Rating:
(2)
Single
_
__ _
1200A
(2)
1600A
(3) _
2000A
(4)
2500A
(5)
3000A
(D) Bus Conductor:
(1)
___
Aluminum
(2)
___
Copper
lec
(3)
___
Hard Maple
(1)
Indoor Vent.
(2)
Outdoor TENV
(3)
Indoor TENV
w
ww
Horizontal Elbows
60HZ
(D)
___
Wall/Floor Ent. Seal
50HZ
(E)
___
Tee
(F)
___
Expansion Joint
(G)
___
Phase Transposition
(H)
___
Bus Termination Seal
(I)
___
Switchgear Term.
____
___
Housing
( 4)
Copper
(5)
Aluminum
_____
Not Required
Transformer Term.
(K)
Flex. Housing Collar
(L)
PVC Splice Boots
(M)
PVC Term. Boots
(N)
Bushing Box Term.
(0)
___
___
(2)
75kA
(R)
___
(3)
80kA
___
(S)
_____
___
As Described by ANSI C37.20
Usual
(2)
Unusual
Seismic Zone
(3)
(2)
·---�
Steel
( 4)
___
(3) . ____
(5)
____�
Column Support
(T)
___
Height
Heaters
___
Outdoor
___
Indoor (Spl)
Thermostat
Special Parts I Requirements
(1)
Aluminum
Knee Brace Support
___
lOOkA
___
Cable Tap Box
Trapeze Hanger
(P)
(Q)
(1)
______
(J)
60kA
_____
(M) Service Conditions:
(G) Housing Material:
IDI
___
Total
___
External
(5)
Housing Type:
.E
(F)
Outdoor
(C)
(3)
(4)
(Cable Bus)
___
Vertical Elbows
Internal
(1)
Porcelain
Indoor
___
Circuit) : Asym. Current
Fiberglass
____
(B)
( L) Momentary Bracing (Short
Bus Conductor Support:
(2)
(A) Bus Duct Footage:
-------
(2)
(6)
(1)
(1)
Three
(K) Ground Bus:
4000A
____
(7)
(E)
(3)
_____
--100% Neutral
-�
Frequency:
(1)
95kV
llOkV
(4)
50% Neutral
(5) (J)
___
Enter Quantity Required:
(3)
(4)
(3)
ANSI-49
Phases:
(2) _
(1)
(6)
60kV
tri
ca
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tM
Bare (600V)
(2)
(5)
(B) Insulation:
___
ANSI-24
ANSI-70
( 1)
___
_
(1)
25kV
(5)
600V
(1)
(1)
ua
ls
(4)
__
_
ANSI-61
an
Approval Drawings:
__
(N) Basic Insulation Level:
Explosive
SQUARED COMPANY
9"';',.'fl..'
""
------
19
ADDITIONAL PRODUCTS
SEGREGATED PHASE BUS
APRIL, 1987
.c
om
POWER ZONE METAL-ENCLOSED BUS
Description: All phase conductors are in a common enclo­
sure, but are segregated by metal barriers between phases.
''
''
:I
Application: Used as generator leads in power plants,
ua
ls
switchgear tie-in for metal-enclosed substations, and in
factories.
Conductors: Copper or aluminum.
Supports: Fiberglass or porcelain.
an
OPEN SUBSTATION BUS
Description: Bare metal conductors mounted on porcelain
insulators, with switches, instrument transformers, etc.,
assembled on structural steel supports to form AC or DC
substation systems.
ca
lP
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tM
Applications: Outdoor substations for utility and industrial
applications.
Conductors: Copper or aluminum.
Supports: Porcelain.
HIGH AMPACITY INDUSTRIAL BUS
�
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I1 !'I
'
..
t
il':
:
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t'-
I
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��
t'- t'- t'-
II
t,t:,t,.j
I��
I
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II
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... 1
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�
In-�
,� ..
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Description: Large bus bar assemblies with fiberglass or
transite insulation, high pressure clamps,
switches for A-C or D-C industrial service.
high current
Application: Low voltage high current A-C and D-C buses
for electric furnaces, electrochemical and electroplating
systems, magnet leads and high energy battery systems.
Conductors: Copper or aluminum.
Supports: Fiberglass or transite.
Description: Each phase conductor is enclosed in an indi­
vidual metal housing, separated from adjacent conductor
housings by an air space.
Application: Used primarily as the main generator leads in
power plants.
Conductors: Copper or aluminum.
Supports: Fiberglass or porcelain.
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.E
ISOLATED PHASE BUS
20------4/87 CPS 20M
SQUARED CDMPRNV
______
PRINTED IN U.S.A.
IDI
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