Xylem BMAID R4 - Manual (Page 40)

PAGE 40
Residential Water Systems
CentriPro
traNSformEr SIzES
A full three phase supply is recommended for all three
phase motors, consisting of three individual trans-
formers or one three phase transformer. “Open” delta
or wye connections using only two transformers can
be used, but are more likely to cause problems from
current unbalance.
Transformer ratings should be no smaller than listed in
the table for supply power to the motor alone.
traNSformEr CapaCIty rEquIrED for Sub-
mErSIblE motorS
Smallest kVa rating –
Submersible total Effective Each transformer
3Ø motor kVa open wyE wyE or
hp rating required DElta 2 DElta 3
transformers transformers
1½ 3 2 1
2 4 2 1½
3 5 3 2
5 7½ 5 3
7½ 10 7½ 5
10 15 10 5
15 20 15 7½
20 25 15 10
25 30 20 10
30 40 25 15
40 50 30 20
50 60 35 20
60 75 40 25
75 90 50 30
100 120 65 40
full thrEE phaSE
opEN DElta or wyE