No, you can use the six main rule. This means you would have a 400 amp main lug panel, with six breakers or less, but no more than six. You can also use six individual disconnects.
You will need a 50 kW generator for a single phase 120/240 volt service.
The four main phase changes are... • Melting from solid to liquid • Evaporating from liquid to gas • freezing liquid to solid • condensation gas to liquid The first three obviously need heat! Not condensation though c:
The reading on the 3-ph meter would equal the sum of the three separate readings on the single-phase meters. The neutral sides of the single phase meters do not need to be connected to the neutral wire as long as they are connected together.
No. For three phase, you need a minimum of a two element meter.
The size of wire for service entrance conductors for a 400 amp 3 phase service could be 500 MCM copper. This is very large size wire and difficult to bend and shape, to connect to terminals in the main disconnect and distribution panel. This problem is solved by using parallel conductors or on higher ampacities triple conductors. Using parallel conductors the wire size would be three ought (3/0) copper.
No. Three phase service is something that you would need to request from your power company. You'd need to not only have service, you also need to have an electrician run 3 phase service into your home.
There is no need of single phase to three phase conversions. Both service types are available from the local utility company.
If the 240V 3-phase service is 240V phase-to-phase, then you can get 240V single-phase by simply picking two phases (poles, as used in the question) and connecting the load across them. This is simply one third of a standard delta connection. If you need 120V/240V split phase, i.e. with a neutral, as used in residential services, you will need a transformer. If the service is actually a four wire "quadraplex" service, however, you will probably already have that 120V/240V with neutral connection phase available. In this case, you will need to pick the two phases correctly in order to get the proper 120V service half.
You need to match the UPS to the service. If it is three phase you need a three phase UPS, and vice versa for single phase. It isn't a case of being better, it is a situation where you need to match your application.
Dissconnect the ac adapter
I'm sure this isn't what you want to hear, but you probably need to ask an electrician familiar with your service and what you want to connect. As a general answer, you can connect a 240v line to line resistive load like an electric water heater to any 240v source. If you also need the 240v to have 120v line to neutral, like a 240v electric stove that contains a 120v clock and oven light, then its possible if the 3 phase power is connected in a "high delta" configuration, and you connect to the correct leads. If you have a high delta service and want to ignore the 3-phase power service and wire most or all of the loads in the building as a single phase load, the utility may have to be consulted.
You probably need a 5hp or 7hp motor. Look for HP rating o the 3 phase motor and select the same for single phase. 3 phase has same power but is more efficient at electricity use. Also consider a 3 phase converter. It allows a 3 phase motor to run on single phase service.
In order to convert from single phase to three phase, you need an inverter or some kind of motor-generator. Variable Frequency Drives for electric motor speed control now feature single phase input with three phase output for motor loads up to 3HP. Good for the home shop where you got a deal on some equipment but lack 3 phase power. For instance, Google this: ATV12H075F1
Usually with a voltage of 600 volts the motor will be three phase. To use a transformer with that motor you will need a three phase 240 volt service. These days utility companies are moving away from three phase 240 and substituting it with 120/208. The 208 three phase service has the added bonus that 120 volts can be obtained from the star point (grounded neutral).
You will need a 50 kW generator for a single phase 120/240 volt service.
The four main phase changes are... • Melting from solid to liquid • Evaporating from liquid to gas • freezing liquid to solid • condensation gas to liquid The first three obviously need heat! Not condensation though c:
For low-power appliances you can buy an electronic power inverter which produces 3-phase outputs from a 1-phase (single phase) service. Such inverters are not cheap to buy so you must decide if it is best to buy an equivalent appliance that runs on 1-phase instead of trying to use a 3-phase appliance on a 1-phase supply using a power inverter. Note: For mains power any 1-phase service is usually obtained by using just one phase of a 3-phase service that comes in overhead or underground cables from the generating station. The power company typically supplies a given neighborhood with a 3-phase service and distributes it as separate 1-phase services, one phase per property or group of properties, so that each property gets a supply of single-phase power. If the owner requires it, it is usually possible to pay the power company to provide a 3-phase service into a house or any other type of property - such as an engineering workshop, vehicle repair garage, etc. - which may need a 3-phase service for machinery or other equipment. +++ An advantage of using an inverter is that many are available with reversing and speed-control, so ideal for driving lathes and similar. Moreover, the machine runs more smoothly: in my own case the noisy resonance of a lathe's welded cabinet stand when running with a single-phase motor stopped entirely when I fitted a 3ph motor and inverter to the same mountings.