6
Sentron Low Amp Busway System
SL402C10PL0
Warehouse Catalog Straight Sections Elbows and Offsets End Tap Boxes
Stock Numbering Tees Center Tap Boxes
System
8 9 10-11 12 13 14
7
225-800Amp
Sentron Low Amp Busway
Flanged Ends Expansion Fittings, Hangers, Supports Technical Data Busway
Reducers and End Closures and Specifications
Phase Rotation Flanges
Fittings
15 16 17 18-19 20
8
Sentron Low Amp Busway
Warehouse Stock
Sentron Low Amp busway is available
from warehouse stock in a wide offering
of straight sections and fittings essential
for completing busway runs. Ordering
from stock, can save the contractor both
time and money over cable and conduit.
Aluminum 3-phase, 3-wire and 3-phase,
4-wire busway is available from 225 amps
to 600 amps. Copper 3-phase, 3-wire and
3-phase, 4-wire busway is available from
225 amps to 800 amps. Copper also avail-
able with integral or internal ground. All
warehouse stock is rated IP40.
The chart to the right lists straight
sections and fittings available through
warehouse stock.
Sentron Low Amp Warehouse Stock
Ampere Rating Description Aluminum Copper
225A
6 ft. Plug-in ✔✔
10 ft. Plug-in ✔✔
5 ft. Feeder N/A N/A
10 ft. Feeder N/A N/A
Flat Elbows ✔✔
Edge Elbows ✔✔
End Tap Boxes ✔✔
Center Tap Boxes ✔✔
Flanged Ends N/A N/A
Flanges ✔✔
Hangers ✔✔
End Closures ✔✔
400A
6 ft. Plug-in ✔✔
10 ft. Plug-in ✔✔
5 ft. Feeder ✔✔
10 ft. Feeder ✔✔
Flat Elbows ✔✔
Edge Elbows ✔✔
End Tap Boxes ✔✔
Center Tap Boxes ✔✔
Flanged Ends ✔✔
Flanges ✔✔
Hangers ✔✔
End Closures ✔✔
600A
6 ft. Plug-in ✔✔
10 ft. Plug-in ✔✔
5 ft. Feeder ✔✔
10 ft. Feeder ✔✔
Flat Elbows ✔✔
Edge Elbows ✔✔
End Tap Boxes ✔✔
Center Tap Boxes ✔✔
Flanged Ends ✔✔
Flanges ✔✔
Hangers ✔✔
End Closures ✔✔
9
Sentron Low Amp Busway
Sentron Low Amp Catalog Numbering System
S L 4 0 2 C 1 0 P L 0 6
Sentron Low Amp
SL = US Lengths
Configuration
3 = 3Ø, 3W
4 = 3Ø, 4W
5 = 3Ø, 4W 200% Neutral
Ampere Rating
02 = 225A
04 = 400A
06 = 600A
08 = 800A1
Bus Bar Material
C = Copper
A = Aluminum
Ground
1 = Integral (Housing)
2 = Internal Bus Bar2
3 = Isolated Ground3
IP Rating
0 = IP40
3 = IP43
4 = IP54
1 Copper Bus Bars only
2 Copper Ground Bars only
3 Copper Ground Bars only:
available in 225A-600A Aluminum Bus Bars
available in 400A-800A Copper Bus Bars only
• Standard feeder lengths shown.
For custom lengths, use the last three catalog
number characters for length in inches,
e.g.: 8'-11" feeder = SL402C10F107
• Catalog Numbers for Hangers and Flanges can be found on page 17
• Specials must be ordered by description (drawing must be included)
See page 56 for New Order Checklist
Plug-in L
Feeder D
Elbows L
Tees E
Offsets F
Combinations O
End Cable T
Tap Boxes
Center Cable T
Tap Boxes
Service Heads H
Transposition R
Joint Stacks Standard
Isolation
Flanged Ends E
End Closures C
EXpansion S
Sections
Reducers Fused
Non-fused
Length 04 = 4'0"
06 = 6'0"
08 = 8'0"
10 = 10'0"
Length 02 = 2'0"
03 = 3'0"
05 = 5'0"
10 = 10'0"
Edge Up
Down
Flat Right
Left
Edge Up
Down
Flat Right
Left
Edge Up
Down
Flat Right
Left
Edge Up Flat Left
Edge Down Flat Left
Edge Up Flat Right
Edge Down Flat Right
Flat Left Edge Up
Flat Left Edge Down
Flat Right Edge Up
Flat Right Edge Down
Vertical Standard
Horizontal
BStandard
Transformer 1 =1 Phase
3 =3 Phase
PG = Phase & Ground
PO = Phase only
GO = Ground only
Suffix part of Catalog Numbers
Straight Sections
Sentron Low Amp Busway can be
ordered with Aluminum or Copper bus
bars. Aluminum bars are available in
225 - 600 ampere sections, and include
an integral housing ground. An optional
copper internal or isolated ground bar is
available in 225-800 ampere sections.
Copper bars are available in 225-800
ampere sections, and include an integral
housing ground. An optional copper
internal ground bar is available. A copper
isolated ground bar is available for 400-800
ampere copper busway.
Sentron Low Amp is also available in IEC
ratings from 100-630 amperes with alu-
minum bus bars or 100-800 amperes with
copper bus bars.
Sentron Low Amp housing is a two-piece
extruded aluminum design which is
assembled using a henrob fastening
process. The self-piercing rivet technology
is a mechanically applied mixture of zinc,
tin and aluminum that coats the rivet to
resist salt, galvanic and other forms of
corrosion. The self-piercing rivets provide
optimal structural integrity.
Feeder Sections
Feeder busway carries the current of the
busway system from the supply source.
Feeder busway does not have plug-in out-
lets. Sentron Low Amp IP40 feeder sec-
tions are warehoused in standard lengths.
Custom lengths and IP43 and IP54 may
be ordered from the factory. Sentron Low
Amp Feeder sections meet IP40 (indoor),
IP43 (spray proof), and IP54 (splash proof)
requirements. One joint stack assembly is
supplied per feeder section.
Plug-In Sections
Sentron Low Amp plug-in sections are
designed with plug-in openings centered
on 24 in. (610mm) intervals. Plug-in open-
ings are staggered on both sides of the
busway for optimum utilization. IP40 plug-
in sections are warehoused in standard
lengths. Sentron Low Amp plug-in sec-
tions meet IP40 (indoor). IP43 (spray
proof), and IP54 (splash proof) require-
ments. One joint stack assembly is provid-
ed per plug-in section.
Plug-In Outlet Features
The plug-in outlet molded guard design
prevents incidental finger contact with live
conductors. Sentron Low Amp plug-in out-
lets are IP 2X rated: a .472 in. (12mm) test
probe is unable to enter a plug-in outlet.
Configuration connections are clearly
marked on the plug-in outlet to ensure
proper contact of phase and ground bars
with bus plug fingers.
Straight Sections
Plug-In and Feeder
C
L of Joint C
L of Joint
120 in.
(3048 mm) GAø
Bø
Neutral
Cø
Standard Feeder Section
Suffix FD02, FD03, FD05, FD10
10
Sentron Low Amp Busway
C
L of Joint C
L Plug-in Outlet C
L of Joint
Sentron Low Amp
12 in.
(305 mm) 24 in.
(610 mm) GAø
Bø
Neutral
Cø
Standard Plug-In Section (Standard plug-in outlets on both sides on 24 in. centers)
Suffix PL04 (4 ft.), PL06 (6 ft.), PL08 (8 ft.), PL10 (10 ft.)
11
Sentron Low Amp Busway
Sentron Low Amp Busway Widths and Weights
Ampere Profile Approximate Weight – lbs per ft. (kg per meter)
Rating 3-Phase 3-Phase 3-Phase 3-Phase 3-Phase 3-Phase
3-Wire 3-Wire 4-Wire 4-Wire 4-Wire 4-Wire
with Ground with Ground 200% Neutral 200% Neutral
with Ground
Aluminum
225 C 2.7 (4.0) 3.0 (4.4) 2.9 (4.3) 3.1 (4.7) 3.0 (4.5) 3.3 (4.9)
400 D 3.6 (5.4) 4.1 (6.2) 3.9 (5.9) 4.4 (6.6) 4.2 (6.3) 4.7 (7.1)
600 E 5.0 (7.5) 5.8 (8.7) 5.6 (8.3) 6.4 (9.5) 6.2 (9.2) 7.0 (10.4)
Copper
225 A 2.7 (4.0) 2.9 (4.2) 3.0 (4.4) 3.1 (4.6) 3.2 (4.8) 3.4 (5.0)
400 C 3.8 (5.7) 4.1 (6.1) 4.4 (6.5) 4.6 (6.9) 4.9 (7.3) 5.2 (7.7)
600 D 5.7 (8.5) 6.2 (9.2) 6.7 (10.0) 7.2 (10.7) 7.7 (11.5) 8.2 (12.2)
800 E 9.0 (13.3) 9.8 (14.5) 10.8 (16.1) 11.7 (17.3) 12.7 (18.9) 13.5 (20.1)
2.00 in.
(51mm)
5.50 in.
(140mm)
4.05 in.
(103mm)
2.75 in.
(70mm)
Profile E
Barsize
4.25 x 0.125 in.
(108 x 3.2mm)
Profile D
Barsize
2.80 x 0.094 in.
(71 x 2.4mm)
Profile C
Barsize
1.50 x 0.094 in.
(38 x 2.4mm)
Profile A
Barsize
0.75 x 0.094
(19 x 2.4)
5.00 in.
(127 mm)
12
Sentron Low Amp Busway
Flat Right Elbow
Suffix ELFR
Elbows and Tees
Elbows
Sentron Low Amp elbows provide a sim-
ple, convenient method of changing the
direction (left, right, up or down) of a
busway run. All elbows are shipped with
a joint stack assembly on one end for
direct connection to the busway system.
Flatwise elbows are used for left and
right directional changes when the
busway system is mounted in the hori-
zontal plane; bus bars run parallel to the
floor. The joint stack assembly may be
moved to the opposite leg to change the
orientation from left to right/right to left.
Edgewise elbows create up and down
directional changes. The joint stack
assembly on edgewise elbows can not
be moved in order to change orientation
from up to down/down to up.
For both edgewise and flatwise
elbows the sum of the two legs may
not exceed 10 ft. (3.05m). See drawings
for minimum/standard dimensions.
Tees
Tees are used to simplify directional and
plane orientation changes in a busway
system. Tees can make 90° bends left or
right and up and down along the busway
run. All tees are supplied with two joint
stack assemblies.
Flatwise tees are used to create left and
right branches.
Edgewise tees are used to create
branches that stem up or down from
the busway run.
12 in.
(305 mm)
12 in.
(305 mm)
C
L
C
LC
L
C
L
of Joint
Flat Left Elbow
Suffix ELFL
12 in.
(305 mm)
12 in.
(305 mm)
C
L
C
L
of Joint
C
L
Edge Up Elbow
Suffix ELEU
12 in.
(305 mm)
12 in.
(305 mm)
C
L
of Joint
C
L
C
L
C
L
Edge Down Elbow
Suffix ELED
12 in.
(305 mm)
12 in.
(305 mm)
C
L
C
L
C
L
of Joint
Flat Right Tee
Suffix TEFR
12 in.
(305 mm)
12 in.
(305 mm)
12 in.
(305 mm)
C
L
C
L
C
Lof Joint C
L
C
L
Flat Left Tee
Suffix TEFL
12 in.
(305 mm)
12 in.
(305 mm)
12 in.
(305 mm)
C
L
C
L
C
L
of Joint
C
L
C
L
Edge Up Tee
Suffix TEEU
18 in.
(457 mm)
20 in.
(508 mm) 34 in.
(864 mm)
8 in.
(203 mm)
8 in.
(203 mm)
8 in.
(203 mm)
8 in.
(203 mm)
12 in.
(305 mm)
1
C
LC
LC
L
C
L
C
L
12 in.
(305 mm)
Of
Joint
Edge Down Tee
Suffix TEED
18 in.
(457 mm)
20 in.
(508 mm)
12 in.
(305 mm)
16 in.
(407 mm)
1
4 in.
(102 mm)
1
8 in.
(203 mm)
C
L
C
LC
L
C
L
C
L
12 in.
(305 mm)
Of Joint
C
L
Of
Joint
34 in.
(864 mm)
1Add 4 inches (102mm) for internal or isolated ground.
13
Sentron Low Amp Busway
Offsets
Offsets
Offsets can be utilized to solve difficult
contour problems and save space. In
applications where space does not allow
for two connected elbows, a single offset
can bypass an obstruction. All offsets are
supplied with one joint stack assembly.
The overall dimension may not exceed
10 ft. (3.05m).
Flat Right
Suffix OFFR
C
L
C
L
C
L
C
L of Joint
C
L
12 in.
(305 mm)
12 in.
(305 mm)
A
Flat Left
Suffix OFFL
C
L
C
L
C
L
C
L
of Joint
12 in.
(305 mm)
12 in.
(305 mm)
A
C
L
Edge Up
Suffix OFEU
C
L
C
L
C
L
of Joint
C
L
C
L
B
12 in.
(305 mm)
12 in.
(305 mm)
Edge Down
Suffix OFED
C
L
C
L
C
L of Joint
C
L
B
12 in.
(305 mm)
12 in.
(305 mm)
Flatwise Offsets, Minimum Leg Dimensions
Ampere “A” Std./min.
Rating Inches (mm)
Aluminum
225 7.0 (178)
400 7.5 (191)
600 8.5 (216)
Copper
225 7.0 (178)
400 7.0 (178)
600 7.5 (191)
800 8.5 (216)
Edgewise Offsets, Minimum Leg Dimensions
Ampere “B” Std./min.
Rating Inches (mm)
Aluminum
225 8.5 (216)
400 8.5 (216)
600 8.5 (216)
Copper
225 8.5 (216)
400 8.5 (216)
600 8.5 (216)
800 8.5 (216)
End Tap Boxes and Center Tap Boxes
C
L
8.6 in.
(218 mm)
C
L
20 in.
(510 mm)
1
15 in.
(381mm)
8 in.
(203 mm)
C
L
31.5 in.
(800 mm)
12 in.
(305 mm)
Horizontal End Tap Box
Suffix ETHS
End Tap Boxes
End tap boxes are non-fusible devices
used to connect cable and conduit to the
end of a busway run or where busway
runs connect without the need for over-
current protection. End tap boxes may be
installed at the end or beginning of a run.
Vertical end tap boxes and horizontal end
tap boxes can be installed in both horizon-
tal and vertical applications. One joint
stack assembly is provided with each end
tap box.
Center Tap Boxes
Center tap boxes are non-fusible devices
utilized to feed to or take off power from
the busway run. When loads served by
the busway run do not require over-
current protection, center tap boxes may
be used. Center tap boxes are an actual
part of the busway run and require a
space of 32 in. (810mm) for installation.
One joint stack assembly is provided with
each center tap box.
Horizontal End Tap Boxes, Lugs
Ampere Cable Lugs per Phase and Neutral
Rating Qty. Size Cu/Al Ground Lugs
#6 AWG-350 kcmil
Aluminum
225 1 #6 AWG - 350 kcmil 1
400 1 #4 AWG - 600 kcmil 1
600 2 #4 AWG - 600 kcmil 1
Copper
225 1 #6 AWG - 350 kcmil 1
400 1 #4 AWG - 600 kcmil 1
600 2 #4 AWG - 600 kcmil 1
800 3 #4 AWG - 600 kcmil 1
Vertical End Tap Boxes, Lugs
Aluminum
225 1 #6 AWG - 350 kcmil 1
400 1 #4 AWG - 600 kcmil 1
600 2 #4 AWG - 600 kcmil 1
Copper
225 1 #6 AWG - 350 kcmil 1
400 1 #4 AWG - 600 kcmil 1
600 2 #4 AWG - 600 kcmil 1
800 3 #4 AWG - 600 kcmil 1
Center Tap Boxes, Lugs
Aluminum
225 4 #6 AWG - 350 kcmil 1
400 4 #4 AWG - 600 kcmil 1
600 4 #4 AWG - 600 kcmil 1
Copper
225 3 #4 AWG - 600 kcmil 1
400 4 #4 AWG - 600 kcmil 1
600 4 #4 AWG - 600 kcmil 1
800 4 #4 AWG - 600 kcmil 1
8 in.
(203mm)
8 in.
(203mm)
C
L
C
L
C
L
Busway
20 in.
(508mm)
1
C
L
6.1 in.
(155mm)
30 in.
(762mm)
16 in.
(406mm)
10 in,
(254mm)
Note: 15 in. (381mm) gutter provided
Center Tap Box
Suffix CTBS
14
Sentron Low Amp Busway
20 in.
(508mm)
1
15 in.
(381mm)
8 in.
(203mm)
C
L
C
L
C
L
24.5 in.
(622mm)
12 in.
(305mm)
10 in.
(254mm)
Vertical End Tap Box
Suffix ETVS
124 in. (610mm) for isolated ground
15
Sentron Low Amp Busway
Flanged Ends
Flanged Ends
Flanged ends provide a direct connection
to low voltage switchgear, switchboards,
motor control centers, large power panels,
and other electrical distribution equipment.
Flanged ends are shipped with one joint
stack assembly. The switchgear manufac-
ture supplies lugs and mounting hardware.
See illustration for flanged end drilling pat-
terns. A combination flange/elbow may be
used when the busway is in close proximi-
ty to the switchgear. Flatwise and edge-
wise combination flange/elbows require a
minimum clearance of 5 in. (127mm) off
the top of the switchboard to the center-
line of the busway.
Flanged End
Suffix FE
1.75 in.
(44mm) 1.75 in.
(44mm)
1.13 in.
(29mm)
1.13 in.
(29mm) 1.13 in.
(29mm)
1.75 in.
(44mm)
4.50 in.
(114mm) 4.50 in.
(114mm)
2.80 in.
(71mm)
1.40 in.
(36mm)
1.75 in.
(44mm) A
A
WW
For 4.25 in. (108mm) Bars
Fig 1, 0.75 in. (19mm),
Fig 2, 1.50 in. (38mm)
and 2.80 in. (71mm) Bars
Housing Ground
C
L
Case
15.00 in.
(381mm)
1.50 in.
(38mm)
6.13 in.
(158mm)
0.62 in.
(16mm)
0.62 in.
(16mm)
0.62 in.
(16mm)
5.00 in.
(127mm)
10.00 in.
(254mm)
0.38 in.
(10mm)
7.87 in.
(200mm)
3.94 in.
(100mm)
1.55 in.
(39mm)
4.33 in.
(110mm)
7.50 in.
(191mm)
12.63 in.
(321mm)
6.32 in.
(161mm)
C
L Case
3.57 in.
(91mm)
W
8.00 in.
(203mm)
8.00 in.
(203mm)
4.00 in.
(102mm) 4.00 in.
(102mm) 4.00 in.
(102mm) 4.00 in.
(102mm)
2.13 in.
(54mm) 5.03 in.
(128mm)
C
L
Case
C
L
Ground Strap
C
L
Joint
Stack
Neutral CØ BØ AØ Isolated Ground
Ground
Dashed lines
denote cutout
Flanged Ends Bus Bar Drilling Pattern, Dimensions
Ampere Dimensions Inches (mm) Figure No.
Rating W A
Aluminum
225 1.50 (38) 0.75 (19) 2
400 2.80 (71) 1.40 (36) 2
600 4.25 (108) 1.25 (32) 2
Copper
225 0.75 (19) 0.38 (97) 1
400 1.50 (38) 0.75 (19) 2
600 2.80 (71) 1.40 (36) 2
800 4.25 (108) 1.25 (32) 2
0.44 in.
(11mm)
0.88 in.
(22mm)
0.88 in.
(22mm)
0.38 in.
(10mm)
Figure 1 Figure 2
ø .56 in.
(14mm)
Expansion Fittings, Reducers and
Phase Rotation Fittings
12.75 in.
(324mm)
8 in.
(203mm)
24.8 in.
(630mm) 21 in.
(533mm)
1
38 in.
(965mm)
8 in.
(203mm) C
L
C
L
Expansion Fitting
Suffix XS
8 in.
(203 mm)
32 in.
(813 mm)
48 in.
(1219 mm)
8 in.
(203 mm)
C
L
C
L
10 in.
(254 mm)
9 in.
(229 mm)
C
L
Phase Rotation Fitting
Suffix TRPG, Phase and Ground
TRPO, Phase only
TRGO, Ground only
Expansion Fittings
Expansion fittings accommodate for
expansion and contraction of a busway
run. In order to compensate for the
difference in the coefficient of expansion
between the copper/aluminum bus bars
and the aluminum housing, an expansion
fitting must be used. Expansion fittings
are installed in the center of long busway
runs, where both ends of the run are held
in a permanent, fixed positions or where
a busway run crosses an expansion joint
of a building. Additionally, NEMA recom-
mends the use of expansion fittings
when the run exceeds 200 ft. (608m).
Expansion fittings allow for a +/- 2 in.
(50.8mm) movement along the length of
the busway system.
Fused Reducers
The NEC (Art. 364-11) requires overcur-
rent protection when busway systems
are reduced in ampacity. A fused reducer
is used to reduce the allowable ampere
rating in those sections of the busway run
that do not require a higher rating (i.e. at
branch circuit junctures).
Non-Fused Reducers
Non-fused reducers are used in conjunc-
tion with the following exception to the
NEC (Art. 364-11): "For industrial estab-
lishments only, omission of overcurrent
protection shall be permitted at points
where busways are reduced in ampacity,
provided that the length of the busway
having the small ampacity does not
exceed 50 ft. (15.2m) and has an ampaci-
ty of at least equal to one-third the rating
or setting of the overcurrent device next
back on the line, and provided that such
busway is free from contact with com-
bustible material."
Special joint stack connections are
provided for non-fused reducer connec-
tions. Consult Factory for specific design
guidelines.
16
Sentron Low Amp Busway
36 in.
(914mm)
1.5 in.
(38mm)
4.5 in.
(114mm)
11 in.
(279mm)
C
L
20 in.
(508mm)
20 in.
(508mm)
Fused Reducer
Suffix RF
Phase Rotation Examples
A
B
C
A
B
C
N
G
A
B
C
N
G
A
B
C
N
N
C
B
A
N
C
B
A
N
C
B
A
G
N
N
C
B
A
G
125 in. (608mm) for isolated ground
Phase-Rotation Fittings
Phase-rotation fittings can be used when
the application requires a phase rotation in
the power supply. Phase rotation fittings
can be ordered for "phase and ground",
"phase only" and "ground only" rotations.
Hangers
A complete selection of hangers is available
to support Sentron Low Amp Busway in
both vertical and horizontal applications. The
standard picture frame hanger comes com-
plete with hardware (cat# UJ100) to connect
to a ceiling hung drop rod. The contractor
must supply drop rods to complete assem-
blies for both picture frame hangers and
trapeze hangers. Picture frame and trapeze
hangers are designed to be hung on maxi-
mum 10 ft. (3.05m) centers throughout the
busway run. Additional hangers may be
used if structural requirements mandate
their use. Spring hangers and floor supports
must be used in vertical applications to pro-
vide secure mounting of the busway run.
Spring hangers counter the weight of the
busway on each floor and also compensate
for minimal building movement and thermal
expansion. Maximum distance between
spring hangers or supports may not exceed
16 ft. (4.88m). When ordering 18 ft. (5.49m)
floor to ceiling height assemblies, intermedi-
ate supports or hangers are necessary.
Flanges
Wall, ceiling and floor flanges are available
for Sentron Low Amp Busway. When the
busway run passes through a wall, ceiling or
floor a flange should be used. Flanges do
not offer support to the busway, only a
means of covering the hole created in the
existing structure. An additional sealant may
be required to meet fire codes and all other
local requirements. No caulking or gasketing
is provided with Sentron Low Amp flanges.
End Closures
End closures safely terminate a busway run
and protect the bus bar ends. End closures
may be removed easily in order to extend
a busway run. End closures are shipped
with Glastic insulation pieces; however,
joint stacks and inspection covers are not
included. To ensure proper installation,
refer to the end closure installation instruc-
tion sheet shipped with end closure.
Lifting Kit
A specially designed lifting kit (cat. no. SLLK)
is recommended when installing Sentron
Low Amp Busway. This lifting kit is designed
to help properly install the busway without
damaging equipment during the process. 17
Sentron Low Amp Busway
Hangers, Supports,
End Closures and Flanges
9.25 in.
(235 mm)
C
L
B
4" D
B= 4 in. plus D/2 (refer to page 11)
Wall Mounted Hanger
SLWH
C Lof Joint
Stack
16 in.Min.
(406mm)
Piercing
Screw
Floor Flange
(optional
Spring Hanger
2 in.Min.
(51mm)
by others
10 in.
(254mm)
Leveling
Jam Nut
Support
Bolt
Spring Hanger Spring Hangers, Requirements
Ampere Catalog Assembly for Floor to Ceiling Height 1
Rating 10 ft. 12 ft. 14 ft. 16 ft. 18 ft.2
Aluminum Busway
225 SLSH218SLSH218SLSH235SLSH418SLSH418
400 SLSH418SLSH418SLSH418SLSH435SLSH435
600 SLSH418SLSH435SLSH435SLSH435SLSH435
Copper Busway
225 SLSH218SLSH218SLSH418SLSH418SLSH418
400 SLSH418SLSH418SLSH418SLSH435SLSH435
600 SLSH435SLSH435SLSH435SLSH435SLSH635
800 SLSH435SLSH435SLSH635SLSH635SLSH635
1For height not listed, use next higher value.
2Additional floor support necessary for intermediate support
Wall, Ceiling and Floor Flanges, Dimensions
Ampere Catalog No.Fig. Dimensions Inches (mm)
Rating “A” Flange “B” Cutout
Aluminum Busway
225 SLWF3 1 7.94 (202) 4.25 (108)
400 SLWF4 2 9.24 (235) 5.55 (141)
600 SLWF5 2 10.69 (272)7.00 (178)
Copper Busway
225 SLWF1 1 7.19 (183) 3.50 (89)
400 SLWF3 1 7.94 (202) 4.25 (108)
600 SLWF4 2 9.24 (235) 5.55 (141)
800 SLWF5 2 10.69 (272)7.00 (178)
A
B
Cutout
3.25 in.
(83 mm)
6.50 in.
(165 mm)
Cutout
10.00 in.
(254 mm)
5.00 in.
(127 mm)
A/2 0.60 in.
(15 mm)
0.38 in.
(10 mm)
0.63 in.
(16 mm)
3.62 in.
(92 mm) 3.62 in.
(92 mm)
A
B
Cutout
3.25 in.
(83 mm)
6.50 in.
(165 mm)
Cutout
10.00 in.
(254 mm)
Figure 1 Figure 2
Wall, Ceiling and Floor Flanges
5.82 in.
(148 mm)
C
L
of Joint
End Closures
Suffix EC
(Joint stack and covers not included)
Picture Frame Hanger
SLPF
(Rods not included)
(UJ100
included)
2.25 in.
(57mm)
Floor Support Hanger
SLFS
8.63 in.
(219 mm)
0.50 in.
(12 mm) Dia.
Threaded Rod
.75 in.
(19.1 mm)
Trapeze Hanger
SLTH
(Rods and Nuts not included)
18
Sentron Low Amp Busway
Technical Data
Voltage Drop
Ampere Bus Bar Width Ohms x 10-3 per 100 feet Voltage Drop - Concentrated Loads, Line-to-Line per 100 feet at 100% Rated Load, 35°C Ambient
Rating x Thickness Line to Neutral Power Factor
Inches (mm) R Z X 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Aluminum
225 1.50 (38) x .094 (2.4) 10.90 11.10 2.10 2.05 2.45 2.83 3.20 3.56 3.89 4.18 4.25
400 2.80 (71) x .094 (2.4) 6.46 6.55 1.08 2.06 2.48 2.89 3.29 3.67 4.03 4.35 4.48
600 4.25 (108) x .125 (3.2) 3.64 3.68 0.54 1.67 2.03 2.38 2.72 3.05 3.36 3.65 3.78
Copper
225 0.75 (19) x .094 (2.4) 13.40 13.50 1.64 2.18 2.67 3.16 3.64 4.11 4.56 4.98 5.22
400 1.50 (38) x .094 (2.4)) 7.09 7.17 1.07 2.18 2.64 3.10 3.54 3.97 4.37 4.74 4.91
600 2.80 (71) x .094 (2.4) 3.92 3.95 0.49 1.70 2.09 2.47 2.85 3.21 3.56 3.89 4.07
800 4.25 (108) x .125 (3.2) 2.11 2.13 0.29 1.26 1.54 1.81 2.08 2.33 2.58 2.81 2.92
Temperature Heat Rise, ALUMINUM
Notes:
1. For plug-in distributed loads, divide voltage
drop values by 2.
2. To determine voltage drop line-to-neutral, multiply
line-to-line values by 0.577.
3. Actual voltage drop for different lengths and at loadings
less than full rated current can be calculated
using the formula:
Vd(actual) = Vd (table) x actual load x actual length (ft)
rated load 100 feet
4. For 50 Hz, multiply reactance (X) by 0.85 and resistance
values do not change.
For 400 Hz, multiply reactance by 3.75 and multiply
resistance by 1.4. Calculate new voltage drop:
Vd= amps load x =√3(Rcos θ+ X sin θ) per
100 ft, where cos θ= Power Factor.
5. For metric conversion R, X, Z values
“in Ohms per meters Line to Neutral”
R x .0328
X x .0328
Z x .0328
6. For metric conversion
“Line to Line per meter at 25° C ambient in mV/A/m”
(Vd 32.8) / A Divide Vd by 2 for distributed loads.
600A
400A
225A
10070
1000
900
800
700
500
400
300
100
200
600
6040 503020010 Temperature Rise °C (above ambient)
Load in Amps Busway
Size
55
800A
600A
400A
225A
10070
1000
900
800
700
500
400
300
100
200
600
6040 503020010 Temperature Rise °C (above ambient)
Load in Amps Busway
Size
55
Temperature Heat Rise, COPPER
19
Sentron Low Amp Busway
UL Short Circuit Ratings
Ampere Bus Bar Width RMS Symmetrical (kA)
Rating Inches (mm) 6 cycle 1 sec. 3 sec.
Aluminum
225 1.50 (38) x .094 (2.4) 30 6 4
400 2.80 (71) x .094 (2.4) 42 17 10
600 4.25 (108) x .125 (3.2) 50 28 16
Copper
225 0.75 (19) x .094 (2.4) 30 10 5
400 1.50 (38) x .094 (2.4) 35 20 12
600 2.80 (71) x .094 (2.4) 42 32 18
800 4.25 (108) x .125 (3.2) 65 42 24
50% Internal or
Isolated
Ground (PE)
A Phase (L1)
B Phase (L2)
C Phase (L3)
100% Neutral (N)
200% Neutral (N)
Ground Capacity
Ampere Bus Bar Width Bars Min. Sectional Area Sectional Area Sectional Area Current Carrying
Rating Inches (mm) per Pole Ground Bus or Enclosure 50% Internal Integral (Housing) Capacity Ratio
UL 857 Table 6.1 Ground Bar Ground Integral/Internal
In2(mm2)In
2(mm2)In
2(mm2)
Aluminum
225 1.50 (18) 1 0.083 (54.0) 0.084 (54.19) 2.124 (1370.32) 11.35
400 2.80 (71) 1 - 0.156 (100.64) 2.582 (1665.80) 7.43
600 4.25 (108) 1 - 0.235 (151.61) 3.094 (1996.13) 5.92
Copper
225 0.75 (19) 1 0.052 (34.0) 0.043 (27.74) 1.868 (1205.16) 19.50
400 1.50 (38) 1 - 0.084 (54.19) 2.124 (1370.32) 11.35
600 2.80 (71) 1 - 0.156 (100.64) 2.582 (1665.80) 7.43
800 4.25 (108) 1 0.105 (68.0) 0.235 (151.61) 3.094 (1996.13) 5.92
Note: Ground bar thickness = .055 in. (1.4mm)
UL 1479 Fire Rated Installation
Sentron Low Amp is certified in accor-
dance with UL 1479 and offers a two
hour fire rating for gypsum wallboard con-
struction, and a three hour fire rating for
concrete slab or block penetrations.
These ratings are achieved using stan-
dard busway installed with SpecSeal®
sealant from Specified Technologies Inc.
20
Sentron Low Amp Busway
1.0 General
A. Furnish and install a complete low
impedance prefabricated busway distri-
bution system as shown on the plans.
B. Busway shall be ____ volts ____ phase
____ wire with minimum 50% capacity
integral ground. Aluminum housing shall
qualify for grounding purposes.
C. The ampere ratings, approximate
footage, fitting, plug-in units, etc., are
shown on the plans. The electrical con-
tractor shall be responsible for routing
the busway to coordinate with the other
trades. Final field measurements shall be
made by the contractor prior to release of
the busway for fabrication.
2.0 Short-Circuit Rating and Tests
A. The short-circuit rating of the busway
shall be (consulting engineer’s calculated
required rating), RMS symmetrical
amperes.
B. The short circuit rating of the busway
shall be determined according to UL
Standard No. 857 or IEC 439-1 and 439-2.
This rating must be based upon actual
tests at the rated short-circuit current for
six (6) cycles.
3.0 Basic Construction
A. Housing
1. The busway housing shall be of
extruded aluminum painted with
polyester urethane powder paint to
provide protection against corrosion.
2. The busway housing shall be totally
enclosed non-ventilated for protection
against mechanical damage and dust
accumulation.
3. The busway shall be certified for ___
IP 40 Indoor, ___ IP 43 Spray Proof,
___ IP 54 Splash Proof).
B. Joint
1. The busway joint shall be of the one-
bolt type which utilizes a high
strength steel bolt and Belleville
washers to maintain proper pressure
over a large contact surface area.
2. The bolt shall be torque indicating,
fully insulated and at ground potential.
3. The bolt 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.
B Joint (cont’d)
4. Access shall be required to only one
side of the busway for tightening joint
bolts.
5. It shall be possible to remove any
joint connection assembly to allow
electrical isolation or physical removal
of a busway length without disturbing
adjacent busway lengths.
C. Bus Bars
1. The bus bars shall be tin plated at all
contact surfaces.
2. Each bus bar shall be insulated over
its entire length with Class B, 130° C
electrostatically applied epoxy
insulation.
3. The temperature rise at any point in
the busway shall not exceed 55°C
rise above ambient temperature
when operating at rated load current.
D. Plug-in Openings
1. On plug-in busway there shall be five
dead front, hinged cover type plug-in
openings on each side of ten-foot
lengths.
2. All openings shall be usable simulta-
neously.
3. Busway shall be installed so that
plugs are side mounted to permit
practical use of all ten plug-in
openings.
4. It shall be possible to inspect the
plug-in opening and bus bars prior to
the installation of the plug-in unit.
5. All plug-in openings should be
rated IP2X.
E. Support of Busway
1. Hanger spacing shall be noted on lay-
out drawings and should not exceed
manufacturers’ recommendations.
2. Feeder and plug-in busway shall be
approved for hanger spacing of up to
10 ft. for horizontally mounted runs
and up to 16 ft. for vertically mounted
runs.
F. Underwriters’ Laboratories Listing
1. All straight lengths, fittings, and plug-
in units shall be listed and marked in
accordance with UL Standard No. 857
or IEC 439-1 and 439-2.
2. This listing shall include mounting of
the busway in any position (i.e., hori-
zontal, flatwise, edgewise, and verti-
cal) without derating.
4.0 Voltage Drop
A. The voltage drop (input voltage minus
output voltage) specified shall be based
on the busway operating at full rated cur-
rent and at stabilized operating tempera-
ture in 35°C ambient temperature.
B. The three-phase, line-to-line voltage drop
shall not exceed 4.2 volts per hundred
feet at 70% power factor concentrated
load, which condition may exist during
motor starting.
5.0 Plug-In Units
A. Plug-in units shall be ___ circuit breaker
type or ___ fusible switch type with visi-
ble blade, and quick-make / quick-break
mechanism.
B. Plug-in units which cannot be operated
directly from the floor shall be equipped
with suitable means for hookstick opera-
tion.
C. The interrupting rating of circuit breaker
plug-in units shall be [ ] RMS symmetri-
cal amperes.
6.0 Plug-In Unit Safety Devices
A. Each plug-in unit shall be mechanically
interlocked with the busway housing to
prevent installation or removal of plug-in
units while the switch is in the ON posi-
tion.
B. Plug-in enclosures shall make positive
ground connection with the ground bus
before the contact fingers make contact
with the phase bars.
C. The plug-in units shall be equipped with
internal barriers to prevent accidental
contact with live parts on the line side of
the protective device during time of wire
pulling.
D. Covers of all plug-in units must have
“releasable” type interlocks to prevent
the cover from being opened when the
switch is in the ON position.
7.0 Fire Rating
A. The busway shall be UL Listed
to meet two-hour fire ratings for gypsum
wallboard construction and three-hour
fire rating for poured concrete or con-
crete block construction.
8.0 Quality
A. All busway products shall be manufac-
tured in a facility which is Quality
Systems registered to ISO9001.
9.0 Approved Suppliers
A. All major components shall be of the
same manufacturer as the busway. The
busway and plug-in units shall be manu-
factured by Siemens.
Sentron Low Amp Busway Specifications
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