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hubbell-acmeelectric.comAuto Zig-Zag Grounding Transformers
D r y - T y p e D i s t r i b u t i o n T r a n s f o r m e r s
See Footnote
②
O
= Fuse Location NEC 450-4, 2014.
}
PRIMARY (Input): 480 Volts 3Ø, 3 Wire
①
50/60 Hz
SECONDARY (Output): 480Y/277 Volts 3Ø, 4Wire
Use 3 Pieces of
Type Number
~
Available In
Nameplate kVA For
Each Transformer
Number of Transformers
Required
Three Phase kVA
Maximum Continious Amperage
Load Per Phase (277 Volts)
T253010S
No Taps Only
1.0
3
10.80
12.50
T253011S
No Taps Only
1.5
3
15.60
18.75
T253012S
No Taps Only
2.0
3
20.70
25.00
T2530134S
Taps & No Taps
3.0
3
31.20
37.50
T2530144S
Taps & No Taps
5.0
3
51.90
62.50
T2535153S
With Taps Only
7.5
3
78.00
93.50
T2535163S
With Taps Only
10.0
3
103.80
125.00
T2535173S
With Taps Only
15.0
3
156.00
187.50
T2535183S
With Taps Only
25.0
3
259.50
312.00
TP530193S
With Taps Only
37.5
3
390.00
468.00
TP530203S
With Taps Only
50.0
3
519.00
625.00
TP530213S
With Taps Only
75.0
3
780.00
935.00
TP530223S
With Taps Only
100.0
3
1038.00
1250.00
TP530233S
With Taps Only
167.0
3
1734.00
2085.00
①
Applicable for the above connection only.
②
Connection diagram (using 3 pieces of 1 phase, 60 hertz transformers connected zig-zag auto) for developing a neutral (4th wire) from a 3 phase, 3 wire supply.
}
For proper over-current protection, refer to the N.E.C. Article 450-5..
~
For transformer dimensions, refer to appropriate table in section 1, page 23.
Each Acme transformer is shipped with detailed wiring diagrams. Refer to nameplate located inside the front cover for specific voltage tap combinations.
DEVELOPING A NEUTRAL FROM A THREE PHASE, 3-WIRE SUPPLY
NEUTRAL
B
POINT
A,B OR C
TO
NEUTRAL
YIELDS
277 V
SINGLE
PHASE
4 WIRE
C
A
B
C
A
INPUT
480 V
3Ø
3 WIRE
B
C
A
X
X
X
X
X
H
H
H
H
X
X
X
X
H
H
H
H
X
X
X
H
H
H
H
COMMON TRIP DEVICE
NEUTRAL
TRANS. #3
TRANS. #2
TRANS. #1