Wiring diagrame of manual single phase changeover

try here: https://www.hunker.com/12429087/how-to-wire-a-single-phase-230v-motor

Hi Bill
I may be wrong here......
But I've been around Electricity for a long time.
Have Never seen a device that does phase conversion.
A Building site or home will either have Three Phase or Single Phase Power Available
BUT...A portable (Hired) generator could be "three phase" and you could use any one of those phases individually or all three phases.

I have 3 Phase supply to my house!
But I use 230 volt Single Phase for appliances.
My Bore Pump uses a 3 Phase Motor,
(so with a voltmeter it would read about 440 vAC to the pump motor).
Some Further Info:
A GENERATOR is basically a motor used the opposite way. Rotate a motor and it Generates.
The Phases refer to the THREE Windings in the supplying generator in your suburb.
A Large Magnet passes each winding in sequence giving you the three ripples in the supply.
Our houses can choose to have 1 Phase or Three Phases from the street when you set up your electric supply.
So... to confirm, look at the wires on the supply poles to the premises. Usually three in our area (Oz)
Most people are not aware that a car Alternator is actually three phase. The Rotor is the magnet that rotates.
The only difference with an Alternator is that each "Phase" is connected to 2 Diodes (6 total) to convert the three phase to DC to charge the vehicle.
The Regulator controls the voltage to the Rotor, thereby controlling the output.
So.... An Alternator could in theory supply 3 Phase in a mobile generator. Custom Made. Constant speed would determine the frequency of 50Hz or 60Hz.
Not sure what country you are in

Hope this Helps or gives you food for thought!


Three phase electric power

A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

Copy following link:
http://waterheatertimer.org/See-inside-main-breaker-box.html

Illustrations include 120Volt single-phase, and split-phase 240Volt..
Mains supply is only split-phase 230volt.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

I'm not sure what you mean about 4 wires coming into your trailer.
4 wires is typical of 3-phase service, but typical trailer usually has single-phase residential service.
Copy following link to see main breaker box and component parts for single-phase residential wiring.
http://waterheatertimer.org/See-inside-main-breaker-box.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Hello,
Look for a "Phase Converter" at Harbor Freight or look in You Tube for info on building one. If you have a lot of welding to do, I would get a better quality converter than they have at HF.

A 3 phase motor will not work on a single phase supply so I'm sorry but a wiring diagram will not help you.

I have not wire this myself
Wiki says under heading of single-phase:
http://en.wikipedia.org/wiki/Three-phase_electric_power
Single-phase loads may be connected to a three-phase system in two ways. A load may be connected across two of the three phase conductors or a load can be connected from a live phase conductor to the system neutral. Single-phase loads should be distributed evenly between the phases of the three-phase system for efficient use of the supply transformer and supply conductors. Where the line-to-neutral voltage is a standard utilization voltage (for example in a 230 V/400 V system), individual single-phase utility customers or loads may each be connected to a different phase of the supply. Where the line-to-neutral voltage is not a common utilization voltage, for example in a 347/600 V system, single-phase loads must be supplied by individual step-down transformers.

So it sounds like you take 2 legs of the 3-phase.
or
Take one leg of the 3-phase and connect to neutral ... neutral could be a ground rod.

I would put a meter on that circuit before hooking up my power saw.

what did you mean by single 3 phase? single phase motor have two wire output 110-110, 3 phase gen have 3 wires 110-110-110. if only two wires here ,this is single phase, all appliances are only single phase so you can connect it here, except some 3 phase motor or dynamo. the ac current has no polarity so you can connect to it all kinds of load depends upon the amperage of of your turbine generators

If its brand new, most possibly the electrician did not bridge the mains connection.
It sounds like an installation fault.

There is usually a jumper between 1-2-3 on the L connection on the mains, and a jumper between 4-5 on the N connection.

Oshie