# Circuit to connect single phase load to 3 phase generator

#### Noor hafeez

Joined Mar 2, 2019
3
What is the circuit diagram to connect a single phase load to a 3-phase synchronous generator (PMG) having 3 output wires

Joined Jul 18, 2013
28,033
Across two phases, provide correct fusing and suitable disconnect etc.
Max.

#### crutschow

Joined Mar 14, 2008
33,347
If you have more than one large load, it may be preferable to run one from one phase, and the other from the other phase to balance the load on the generator.

Joined Jul 18, 2013
28,033
For truly balanced loads however, it would require three loads across each pair.
Max.

#### crutschow

Joined Mar 14, 2008
33,347
For truly balanced loads however, it would require three loads across each pair.
Max.
True.
I should have said "help balance the load".

#### Noor hafeez

Joined Mar 2, 2019
3
For truly balanced loads however, it would require three loads across each pair.
Max.
Thanks,
Could you help with circuit diagram to connect three single phase load to a 3 phase generator with just 3 wies. There is no neutral wire in the generator

Joined Jul 18, 2013
28,033
No diagram needed, just connect each 1phase load to each distinct pairs/phases. R,S,T = R-S, R-T, S-T .
Max.

#### crutschow

Joined Mar 14, 2008
33,347
Here's a diagram if you really need it.

#### Noor hafeez

Joined Mar 2, 2019
3

#### Ramussons

Joined May 3, 2013
1,371
What is the circuit diagram to connect a single phase load to a 3-phase synchronous generator (PMG) having 3 output wires
You cannot connect a single phase load to a 3-phase 3 wire generator. Stop.

3 phase output with 3 wires is obviously a Delta connection. The voltage will be √3 times the Single Phase voltage.
This means the if Single phase is 230 Volts, the Phase to Phase voltage will be 400 !!!
If you connect a Single Phase Load across any 2 wires of the generator, it's goodbye to the Load, Generator or both with, maybe, a lot of sparks and smoke as an added show.

You will need to use a Delta - Star Transformer to derive the 3 Phases with Neutral so that you can connect your Single Phase load.

Joined Jul 18, 2013
28,033
So what if he has 400v loads, it will work perfectly well.!!?
Or whatever the phase to phase voltage is.
A phase to a phase IS single phase.
Max.

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#### mvas

Joined Jun 19, 2017
539
What is the circuit diagram to connect a single phase load to a 3-phase synchronous generator (PMG) having 3 output wires
What is the RMS Voltage between any two Phase Wires of your generator?
What is the Voltage required by your loads?

Until you answer the above two questions, we cannot provide a definitive answer ...

Last edited:

#### Ramussons

Joined May 3, 2013
1,371
So what if he has 400v loads, it will work perfectly well.!!?
Or whatever the phase to phase voltage is.
A phase to a phase IS single phase.
Max.
I read more than what was written by the OP.
A single phase load is normally 110 / 220 Volts. Not 190 or 400.

#### GetDeviceInfo

Joined Jun 7, 2009
2,180

You cannot connect a single phase load to a 3-phase 3 wire generator. Stop.

3 phase output with 3 wires is obviously a Delta connection. The voltage will be √3 times the Single Phase voltage.
This means the if Single phase is 230 Volts, the Phase to Phase voltage will be 400 !!!
If you connect a Single Phase Load across any 2 wires of the generator, it's goodbye to the Load, Generator or both with, maybe, a lot of sparks and smoke as an added show.

You will need to use a Delta - Star Transformer to derive the 3 Phases with Neutral so that you can connect your Single Phase load.
Not true. Line voltage is phase voltage in a Delta. We run lots of single phase loads off of Delta.