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Its the "classic third line problem" that took weeks to correct previously, never expecting an unlimited journey man to leave it for conciencious maintenance. Neil: Your best listeners are the ones that like you enough to listen through the noise and fading. Although this connection delivers three-phase currents which are approximately symmetrical to a three-phase symetrical load, the currents flowing in the high voltage circuit are not equal nor are they 120 degrees apart. There are many ways to get around three phase open delta, perhaps the best is a rotary phase converter.
Regardless of any of that, this particular service is about to be disconnected permanently.  Good riddance.
From the OP’s question I surmise he is not familiar with our earthing (grounding) requirements.
I was never able to find an electrician with enough stamina to get three-phase power systems through my thick skull so after retiring, I started investigating three-phase on my own. The center-tap on the secondary of winding AC is the neutral for the 120 volts (split phase). Our earthing (grounding) system is TN-C-S; Protective Earth (ground) and N (neutral) are common up to a point and are separate from that point on.
Any society that would give up a little liberty to gain a little security will deserve neither and lose both.
When troubleshooting electrical problems in a house, you can avoid watts of frustration by learning or reviewing things about your electrical system. Electricity flows to your lights and appliances from the power company through your panel, its breakers, out on your circuits and back. By Code, a dedicated circuit is used for each of most large appliances like the electric range, electric water heater, air conditioner, or electric dryer; these as well as electric heaters will have two (joined) breakers in order to use 240 volts rather than the 120 volts used by most other items. Circuits serving more than one outlet or light pass power on to successive locations by means of connections in the device itself or in the box the device is mounted in. Sometimes the behavior of electricity in a home is explained by a comparison with plumbing. Two of the transformer's terminals are isolated from the earth and the third is connected to the earth. A circuit's hot wire is, we might say, one half of the path the circuit takes between the electrical source and the operating items ("loads").
Hot wires are distributed into your home from a number of circuit breakers or fuses in your panel. Besides black, red, and white wires, the cables in homes wired since the 1960's also contain a bare or green "ground(ing)" wire. Other specialized switches include dimmers, motion sensors, photocells, timed switches, thermostats, and "smart home" (X-10) switches. When you have learned enough, you'll be ready to go to the page for Troubleshooting these problems in your own home. Here is a schematic picture of all the major parts of your home electrical system.There are many connections along these paths that can be disrupted or fail, and there are many ways that electricity could go places you don't want it to. Its built-in safety features can stop power in time, but other connections, broken lines, storms, imperfections, or mistakes can sometimes allow unusual voltages into your system, possibly damaging parts of it. Your central breaker panel (or fusebox) directs electricity through your home as a number of separate circuits, each flowing "out" from its own circuit breaker (or fuse) on one wire and returning from whatever is using the electricity to another connection in the panel by means of another wire. A dedicated circuit of 120 volts is usually provided for each dishwasher, disposal, gas or oil furnace, and clothes washer. So on any one circuit there are many places where electricity can fail to get through -- from the circuit breaker and its connections, through a number of connections at devices and boxes, through switches, and at the contacts of a receptacle where you plug something in.


To understand the function that different wires in a circuit play, consider first our use of terms.
We call these isolated wires "hot" or "live" because anything even slightly connected to the earth (like us!), when touching a hot wire, provides, along with the earth, an accidental path for electricity to flow between that wire and the transformer's "grounded" terminal. Like the neutral, it is ultimately connected to the tranformer's grounded terminal, but this wire is not connected so as to be part of the normal path of flow around the circuit. By code, convention, and good reasons, only hot wires are supposed to be switched, never neutrals or grounds. Working with a more complex issue, you might want to beef up your education with this Tutorial about the connections in electrical boxes. The sensitivity of home electronic equipment to this has made us more aware of this possibility, so that our use of surge protectors has become common.
The breaker or fuse will interrupt the current (the flow) if it ever starts to approach a dangerous level. Most other 120-volt circuits tend to serve a number (from 2 to 20) of lights and plug-in outlets.
Troubleshooting electrical problems in your house will depend on a basic grasp of these matters. Because a house is provided with alternating current, the terms "positive" and "negative" do not apply as they do to direct current in batteries and cars. For a 240-volt circuit, the other half is a hot wire from the other phase -- the other hot coming from the transformer.
The earth-related neutral wires in your home are also distributed from your panel, but from one or two "neutral bars". Instead, it is there to connect to the metal parts of lights and appliances, so that a path is provided "to ground" if a hot wire should contact such parts; otherwise you or I could be the best available path. This diagram shows how a household switch works:A switch is a device that continues the hotness of a hot wire on through to, say, a light or else discontinues that hotness. There are diagrams (here's a Preview) of a switched outlet, three-way switches, a series of outlets, and all the switches and lights related to them. And I have this page full of Connections Diagrams, which is to show most of the possible ways wires connect in outlet, light, and switch boxes.
But some surges are difficult to protect against and can be similar to lightning strikes in their effects.This diagram gives a closer look at the source of 120 and 240 volts in the company's transformer. This diagram compares a main panel as I have diagrammed it so far, with how a typical panel is arranged:There may be in the panel a distinct "main" breaker that can shut off power to most or all the circuits.
If it were always as simple as current from the source following only one possible path out to one light and back by one return path, then the operation or malfunction of a circuit would be easy to grasp.
It is true that water pressure (voltage) through a certain size of pipe or showerhead (resistance) can result in a certain rate of flow (current), and that a certain number of gallons (kilowatt-hours) will thereby be delivered. Instead, the power company is providing electricity that will flow back and forth 60 times per second. When they are turned on (operating, running), the loads are part of the path of the current and are where the electricity is doing its intended work.
So the black or red wire between a switch and its light is not always actually hot; when it is not hot, its color is still valid, to remind us that it will sometimes be hot.
The electricity flows through the transformer, on the one hand, and the operating household items, on the other hand, by way of the continuous wire paths between them.
Contact with them should not normally shock you because they are connected to the earth much better (we assume) than you can be. These devices automatically turn power off, but connections at any one of these points -- at the meter, at the main breaker, inside the main breaker -- can fail or become unreliable, disrupting some or all the power in your home.


This diagram lets you trace the path of one circuit as it goes through your system:Code and convention define a circuit in a home as having its source at one of the home's circuit breakers or fuses. Then to compare this same circuit as it connects in electrical boxes with how its cables would be run in a particular set of rooms in a home, go to Circuit cabling. Taking this as the starting place of the electrical source, then, we will find that most circuits in a home are complex, involving sub-branches like those of a tree. Even when they are switched off, we call these wires hot to remind ourselves that they will be, and to distinguish them from neutrals and grounds.
They normally work by one switch continuing hotness to another on one or the other of two "traveler" wires that run between the switches; the final switch connects either the hot traveler or the unhot traveler on to the light, thus energizing the light or not.
I recommend you view these files; you may recognize things in them that are like what you find in your own home. I am a programmer since 2009 before that I just search things, make small projects and now I am sharing my knowledge through this platform.I also work as a freelancer and did many projects related to programming and electrical circuitry. For each type of motor there are many different mounting arrangements, for example foot mounting, flange mounting or combined foot and flange mounting. The cooling method can also differ very much, from the simplest motor with free self-circulation of air to a more complex motor with totally enclosed air-water cooling with an interchangeable cassette type of cooler.To ensure a long lifetime for the motor it is important to keep it with the correct degree of protection when under heavy-duty conditions in a servere environment. The two letters IP (International Protection) state the degree of protection followed by two digits, the first of which indicates the degree of protection against contact and penetration of solid objects, whereas the second states the motor’s degree of protection against water. It is relatively cheap and the maintenance cost is normally low.There are many different manufacturers represented on the market, selling at various prices. High efficiency enables significant savings in energy costs during the motor’s normal endurance. The low level of noise is something else that is of interest today, as is the ability to withstand severe environments.There are also other parameters that differ.
The design of the rotor affects the starting current and torque and the variation can be really large between different manufacturers for the same power rating.
When these motors are used together with a softstarter it is possible to reduce the starting current further when compared to motors with low starting torque.
A motor with two poles often has a lower starting torque than motors with four or more poles.VoltageThree-phase single speed motors can normally be connected for two different voltage levels. If the rating plate on a squirrel cage motor indicates voltages for both the star and delta connection, it is possible to use the motor for both 230 V, and 400 V as an example.The winding is delta connected at 230 V and if the main voltage is 400 V, the Y-connection is used. When changing the main voltage it is important to remember that for the same power rating the rated motor current will change depending on the voltage level.
The method for connecting the motor to the terminal blocks for star or delta connection is shown in the picture below.Power factorA motor always consumes active power, which it converts into mechanical action. Reactive power is also required for the magnetisation of the motor but it doesn’t perform any action. In the diagram below the active and reactive power is represented by P and Q, which together give the power S.The ratio between the active power (kW) and the reactive power (kVA) is known as the power factor, and is often designated as the cos ?.
Really big motors have a tendency to have a very low starting torque, sometimes even lower than the rated torque. This helped me troubleshoot a new crane hydraulic power unit motor controller that was wired incorrectly on our vessel.




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