Transformer wiring
Transformer wiring
(OP)
I was sizing the wires for transformer by using the data sheet. Then I saw the things like this:
Three Phase 600-120/208v
30Kva, Primary 3#8-16mmC, Secondary 4#2+GND-35mmC.
Single Phase 600-120/240v
25Kva, Primary 2#6-21mmC, Secondary 3#1-41mmC.
My questions are
1. why we need grounding for the secondary of three phase transformer but not for primary?
2. why we do not need any grounding for single phase 600-120/240v?
thank you in advance.
Three Phase 600-120/208v
30Kva, Primary 3#8-16mmC, Secondary 4#2+GND-35mmC.
Single Phase 600-120/240v
25Kva, Primary 2#6-21mmC, Secondary 3#1-41mmC.
My questions are
1. why we need grounding for the secondary of three phase transformer but not for primary?
2. why we do not need any grounding for single phase 600-120/240v?
thank you in advance.






RE: Transformer wiring
Three phase wires plus neutral. The neutral should be grounded. If the load is all three phase then the neutral conductor is not needed as a neutral but is still required for grounding.
Single phase. Two line wires plus neutral. The neutral should be grounded. If the load is all 240 V then the neutral conductor is not needed as a neutral but is still required for grounding.
Whoever listed the information was inconsistent in his use of the word "Ground".
yours
RE: Transformer wiring