Cut Sheet
31
Technical Data TD01701001E
Effective March 2017
UL low-voltage busway
Pow-R-Way III
EATON www.eaton.com
Physical data (continued)
Transformer flange connections (Figure 37 and Figure 38)
Transformer flange connections are used when making a connection
to a dry-type substation transformer. Transformer flange connections
include flexible connectors between the transformer low-voltage
spades and the Pow-R-Way III flange bus bars. Hardware is supplied
to bolt the flange plate to the transformer enclosure.
Figure 37. Transformer flange connections
Figure 38. Transformer flange connection detail
Protected reducers (Figure 39)
Protected reducers are used to reduce the ampacity of busway
using either a circuit breaker or a fused, non-automatic circuit breaker
overprotection device. Both serve as a disconnecting means. The
line side of the cubicle is connected to the higher rated busway and
the load side is connected to the lower (reduced) rated busway.
Figure 39. Circuit breaker or fused reducer
Table 45. Circuit breaker and fused reducer dimensions
Circuit breaker reducer Fusible switch reducer
Breaker
amperes
Inches (mm)
Fuse
rating
Inches (mm)
A B X A B X
225 18.25
(463.6)
18.00
(457.2)
34.00
(863.6)
200 18.25
(463.6)
18.00
(457.2)
42.25
(1073.2)
400 18.25
(463.6)
18.00
(457.2)
34.00
(863.6)
400 18.25
(463.6)
18.00
(457.2)
54.00
(1371.6)
600 18.25
(463.6)
18.00
(457.2)
34.00
(863.6)
600 18.25
(463.6)
18.00
(457.2)
60.00
(1524.0)
800 18.25
(463.6)
18.00
(457.2)
42.25
(1073.2)
800 18.25
(463.6)
18.00
(457.2)
60.00
(1524.0)
1000 18.25
(463.6)
18.00
(457.2)
42.25
(1073.2)
1000 18.25
(463.6)
18.00
(457.2)
60.00
(1524.0)
1200 18.25
(463.6)
18.00
(457.2)
42.25
(1073.2)
1200 18.25
(463.6)
18.00
(457.2)
60.00
(1524.0)
1600 26.25
(666.8)
20.00
(508.0)
48.00
(1219.2)
— — — —
2000 26.25
(666.8)
20.00
(508.0)
48.00
(1219.2)
— — — —
2500 26.25
(666.8)
20.00
(508.0)
48.00
(1219.2)
— — — —
Non-protected reducers (Figure 40)
Non-protected reducers are used to reduce the ampacity of the
busway without overcurrent devices. Per NEC Section 368.17, for
industrial applications, no overcurrent protection is required where the
busway is reduced in size, provided the length of the smaller busway
does not extend more than 50 ft (15.2 m) and has a current rating of
at least one-third of the first upstream overcurrent device.
Figure 40. Non-fused reducer
L
L
C
L
L
C
L
L
C
C
2
0
.
00
(
508.0
)
Fl
e
xi
b
l
e
Br
a
i
d
X
X
X
X
x
x
x
x
x
x
x
Tr
a
n
s
f
o
rm
er
T
a
nk W
a
l
l
”
X
“
N
u
m
be
r
a
n
d
Diameter of Hole
s
”
X
“
Thi
c
kn
ess
LV S
p
ade Detai
l
Fr
o
n
t
Vi
e
w
o
f Tr
a
n
s
f
o
rm
er
LV S
p
ade
s
x
x
x
x
x
x
x
S
i
de
Vi
e
w
o
f Tr
a
n
s
f
o
rm
er
12.00
(304.8)
(Minimum)
Pow-R-Bridge
12.00
(304.8)
(Minimum)
X
B
A
Circuit Breaker
or Fused Reducer
C
C