Cut Sheet

30
Technical Data TD01701001E
Effective March 2017
UL low-voltage busway
Pow-R-Way III
EATON www.eaton.com
Physical data (continued)
Transformer throat connections (Figure 35 and Figure 36)
A transformer throat is used when making connections to a liquid-
filled substation transformer. All transformer throat connections
include flexible connectors between the transformer low-voltage
spades and Pow-R-Way III bus bars. For transformers with drilled
flanges, the busway will bolt to the transformer throat instead of
using a sealing ring.
Figure 35. Transformer throat
Table 44. Transformer throat connections
UL 857
ampere rating
Bars per
phase
Minimum dimensions in inches (mm)
A
Aluminum
225–1350 1 26.00 (660.4)
1600–2000 1 28.50 (723.9)
2500–4000 2 31.50 (800.1)
Copper
225–2000 1 26.00 (660.4)
2500 1 28.50 (723.9)
3200–5000 2 31.50 (800.1)
Figure 36. Transformer throat connection detail
Transformer
Transformer
Throat
Sealing Ring
Transformer Throat
Transformer
Sealing Ring
Front
Edge of
Transformer
Throat
Edge of
Transformer
Throat
1.75 (44.5) Plus
1/2 Duct Width
9.50
(241.3)
Front
T
L
C
A
A
L
C
x
x
x
x
x
x
Bushin
g
Ed
g
e o
f
Thr
oat
Co
ll
ar
In
d
i
cate
N
u
m
be
r
of Holes
,
Di
a
m
ete
r
o
f
Holes
,
an
d
Spacin
g
B
et
w
ee
n H
o
l
es
To
p
of Transforme
r
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
Di
a
m
ete
r
o
f H
o
l
es
”
X
“
Thi
c
kn
ess
Fr
o
n
t
LV Thr
oat
LV S
p
ade
s
S
i
de
Vi
e
w
o
f Tr
a
n
s
f
o
rm
er
LV S
p
ade Detai
l
x
x
x
C
L
C
C