Cut Sheet
29
Technical Data TD01701001E
Effective March 2017
UL low-voltage busway
Pow-R-Way III
EATON www.eaton.com
Physical data (continued)
Single-phase transformer taps (Figure 33)
Single-phase transformer taps arrangements are used for connections
to three single-phase transformers. The bus extensions do not
include drilling or lugs (see Figure 2 on page 2 for wiring
configuration designations).
Figure 33. Three single-phase transformer taps
Table 40. Single-phase transformer taps
UL 857 ampere rating Minimum dimensions in inches (mm)
Cu Al X Y
a
225 225 4.00 (101.6) 7.00 (177.8)
400 400 4.00 (101.6) 7.00 (177.8)
600 600 4.00 (101.6) 7.00 (177.8)
800 — 4.00 (101.6) 7.00 (177.8)
1000 — 4.50 (114.3) 9.75 (247.7)
1200 800 5.00 (127.0) 10.75 (273.1)
1350 1000 5.50 (139.7) 11.75 (298.5)
1600 1200 6.50 (165.1) 13.75 (349.3)
2000 1350 7.75 (196.9) 16.25 (412.8)
— 1600 8.50 (215.9) 17.50 (444.5)
2500 2000 10.25 (260.4) 21.25 (539.8)
3200 — 6.50 (165.1) 13.75 (349.3)
4000 2500 7.75 (196.9) 16.25 (412.8)
— 3200 8.50 (215.9) 17.50 (444.5)
5000 4000 10.25 (260.4) 21.25 (539.8)
a
Includes ground tap.
Three-phase transformer taps (Figure 34)
Three-phase transformer taps are used when making connections to
a three-phase transformer. The bus extensions do not include drilling
or lugs.
Figure 34. Three-phase transformer taps
Table 41. A minimum dimensions
Wire
designation 3W/3WH
3WG/3WHG/
3WI 4W/4WH
4WG/4WHG/4WI/
4WNG/4WNHG/4WNI
Inches 16.50 16.50 19.50 19.50
mm 419.1 419.1 495.3 495.3
Table 42. B minimum dimensions
Wire
designation 3W/3WH
3WG/3WHG/
3WI 4W/4WH
4WG/4WHG/4WI/
4WNG/4WNHG/4WNI
Inches 6.25 12.12 9.25 15.12
mm 158.8 307.8 235.0 384.0
Table 43. C minimum dimensions
Wire
designation
50% housing
ground
50% integral ground and
100% ground
Inches 3.00 6.00
mm 76.2 152.4
8.50 + y
(215.9) + y
8.50 + X
(215.9) + X
8.50 + X
(215.9) + X
8.50 + X
(215.9) + X
17.00 + 2X
(431.8) + 2X
17.00 + 2X
(431.8) + 2X
8.50 + X
(215.9) + X
8.50 + X
(215.9) + X
Pow-R-
Bridge
Ground when
Required
C Phase
or Neutral
A Phase or
Neutral
B Phase
or Neutral
Taps
C
L
C
L
Pow-R-
Bridge
C
L
Pow-R-
Bridge
C
L
Pow-R-
Bridge
C
L
Taps
C
L
Taps
C
L
6.00
(152.4)
7.50
(190.5)
N
C
B
A
G
6.00
(152.4)
C
6.00
(152.4)
6.00
(152.4)
A
Taps
B
15.00
(381.1)
(2/0)
Support Pad
(1/0)
C
C