Heating power in washers ( W = V * A)

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There is not that much of a difference between 115/110v/120v or 220v/230v/240v. Appliances designed to run on 240v are normally quite happy on 220v or 230v. Miele sells several appliances, including their large commercial washing machines which have 240v on their electrical plate, but run just fine on USA 220v power.

Multiple family dwellings (apartment buildings, and so forth), may or may not have 220v power coming into each unit, it all depends upon how things are wired from the conduit to the building's main panel and on up to the circuit breaker or fuse box for each unit.

IIRC, many homes in the USA get 220v power from the electric company to their panel, where it is split into two, providing 110v power. If a circuit requires 220v power two lines in the panel are made into "one" thus giving the proper amount.

Apartment buildings and other homes may have 220v power coming into the building, but it is distributed as 110v to each unit's fuse box/panel. This is where many persons wishing to install European laundry and kitchen appliances, or even anything else running on 220v power found a nasty and expensive surprise. Not only didn't their apartment have the proper power, it doesn't even come into their building. This requires major electrical work both to bring the proper power in from the street to the main panel, then wiring to bring that power up to the unit.

Again, the above battle Miele fought with countless persons who wanted their appliances, but either could not or would not expend the effort and funds to have 220v power where there was none.

As for the battle between gas and electric, remember not every area of the USA had the luxury of both gas and electric service. Often while there was electric service, gas was not piped to their area or street. Wanting to have such service would require the gas company to lay pipes, something they often would not do for just one customer on block, that is unless there was a pipe already running past their house.

As coal was phased out for heating and hot water fuel, many homes, especially in the Northeast went to oil. This could mean electric was used for the dryer and range. There was a big fear that gas would cause one's home to "blow up", a thing some still believe. Also until recently, oil was much cheaper than natural gas in most areas of the USA.

ToggleSwitch makes a good point: USA housewives by and large stopped boiling their laundry once automatic washing machines came upon the scene, while it was common to see boil washes in the UK and Europe up until rather recently. There simply wasn't a perceived need for a washing machine that heated water.

Most laundry rooms, or at least the washing machine, in the USA was located near the source of hot water. This meant basements, or kitchen areas. Either way the hot water from the central tank, (which could also be on the ground floor), didn't have to travel very far. Given the vast amount of water top loaders used, even if the first gallon was cool or tepid, the balance would be hot enough. What the hot water did not take care of in terms of cleaning, stain removal and whitening, Americans added LCB, gallons of the stuff to get the job done.

European homes, including apartment flats OTHO generally required eletric power in greater amounts than on this side of the pond because of several factors.

First, aside from coal, there isn't that much in the way of natural resources such as petrol, aside from UK and northern countries. It is still quite common to find flats in the UK and Europe without central heating, and certianly without central hot water boilers. One installs such things when one fits out the flat. So consider there may be one, two or more hot water heaters, electric "space" heaters, perhaps the range, a washing machine, perhaps a dryer, along with everything else that ran on electric power. Right there alone you are going to have a larger power need than most American homes/flats.
 
Multiple family buildings-usually are fed with 208/120V 3 phase power-at least in the US.Heavy loads such as ranges,HVAC equipment,dryers run from the 208V voltage.Phase to neutral gives you 120V.This allows the loads to be balanced on each phase.Power companies like that.If you look on the back of the building you will typically find a ground mount distribution transformer that steps the dist voltage-anywhere from 2500V-31,000V to 208/120V 3ph.A few apartment buildings are fed with 480V 3ph-runs the large building HVAC-and another transformer in the basement of the building steps 480V 3ph to 208/120.I lived in such an apartment house.For individual apartments its common for the AC and the range to run off 208V-they will run just fine-many landlords order appliances just made for 208V.If you run the 220-240V range from 208V The burners won't run as hot-cooking times will be longer-same with a 220-240V clothes dryer.sometimes the compresser in the apt AC runs from 208V 3 phase.The fans run from 208V single phase or 120V.As far as power feeds go 208/120V is the most common used commercial and multiple residentual power source.
Next is 480/277V.
 
Unless fitted with commercial-grade appliances, stuff in apartments or family dwellings don't run off 3-phase. Very large HVAC equipment or common liquid chillers might, but normal split systems will not.

While 3-phase power is brought into the building, it is transformed as single phase. Each phase powering so many dwellings to keep the phases balanced. It's the same principle the power company uses when hooking up houses off the lines. If you ever see exposed power lines in a neighborhood, look how the transformers are hooked to the houses. Each house is on a different phase. That's to keep the lines balanced.

The 240/120 setup in American homes comes from a center-tapped transformer....not from a phase-phase setup. It is all single phase with a split secondary winding in the transformer on the pole. From either end of the secondary to the center tap is 120V. From line to line on the secondary gives you 240V. That is why you have 3 wires coming into your fuse box. 2 are 120, the 3rd is the center tap or "neutral". Neutral is grounded both at the pole and at the ground strap at the main distribution panel.

When you have a 240v circuit in the US, it always involves 2 fuses or a double-ganged circuit breaker. This bridges the 2 120v busses to create the 240v required for the appliance. All 240V appliances in the US are either 3 or 4 wire. 3 wire gives you the 2 "hot" wires and the "neutral" wire. 4 wire adds a ground wire.

It is extremely uncommon to have 3-phase appliances in a home setting....even in multiple dwellings. The cost is extremely high and the benefit of using 3 phase is negated with the relatively small power draw. Many high current draw devices such as stoves, heaters, dryers, or water heaters can't run off 3 phase anyway. Resistance heating is single phase unless multiple elements are paralleled across the phases. You normally don't see that except for in restaurants where lots of high powered appliances reside in one place.
 
In one of the apartments I lived in-the Luxaire HVAC unit specified that the compressor ran from 208V 3Ph. I was surprized to see that as well.The building was very large-8 stories-and had two 208/120V 1200Amp feeder transformers.the primary voltage was 13,820V-provided by PEPCO.The unit was in my large 1 bedroom apartment.the studio apartment compressors ran from 208V single phase.The heat in the large apartment was gas.In the small apartment it was electric.In the utility room of the building-the power was divided into "risers"each 3 phase feeding each floor.This is a standard in large apartment and condo buildings.the building engineer gave me the grand "tour" of the goings on in the buildings in the complex.Each one had two 3p 208/120V transmformers.One transformer fed one half of the building-the other-the other half.Another apratment building it was smaller-had the 480/277V 3ph transformer out side the back of the buiulding.the 480V-208/120V transformer was in the basemewnt in a transformer room.All of the apartments I lived in had gas ranges.That second building-by a diffrent landlord had a central liquid water chiller system-the 480v ran the chillers.All multiple family buildings I have lived in or seen had 3 phase power.It would be just too unecenomical to feed them the standard residentual 240/120V single phase power.Some very large (mansions) have 3 phase power as well-again 208/120V 3 ph.the HVAC in those homes is too large to run from standard single phase power.At one of the radio stations I worked at the station owners home was big enough to run from 208-120V 3 phase.I had to wire the motors in his workshop tools for the 208V 3 phase.also the organ blower motor for his pipe organ he had installed in the house ran from 3 ph 208V.
 
Help me please! I always get confused :D

In the USA coexist

1- 110/115/120V for small appliances
2- 208V 3phase
3- 220/230/240 single (split) phase, hot to hot
4- 480/277V 3phase

isn't it?
 
Many farms are wired for three phase power for that matter.
for the voltages---
208/120V 3 ph you get 208V if you go phase to phase.you get 120V if you go from phase to neutral or ground-In the US Neutrals are grounded.
For 220-110V this means 220V across the two "hot leads going into the home from the power feed.you get 110V if you go from one hot lead to ground or neutral.You are connected to the secondary of the distribution transformer provided by the power compant that steps their distribution voltage to the low voltage for the building or household The secondary of the transformer is center tapped-the center tap is grounded and is the neutral.Wish I could draw it here-but can't-The two "Hot lines from the transformer are the hot sides of the winding.Across both you get 220V go from on or the other to neutral you get 110.For 230V you would get 115V.For 240V (Most commonly used now)you get 120V from hot to neutral.
480/277V 3 ph is used mostly for commercvial and industrial buildings-many motors and industrial machines run from 480V 3 ph.the 277 is the voltage you get from phase to neutral.In these buildings the 277V is commonly used to run flourescent lights and HID lights.that is one way to tell if the building has 480/277-If you find flourescent lamp fixtures marked "for 277V" that the place has the 480V feed.The 277V primary voltage for lighting is now common in the US.Its easy for electricans to wire and it can be used to balance lighting loads in the buildings evenly.In 208V equipped buildings the lamp fixtures run from 120V.It is also common in many 480V fed buildings to have another transformer to step down the 480V to get 208/120V for the 208V and 120V appliances.Another reason dist transformer secondary neutrals are grounded is safety-if the transformer has a primary to sec winding short-the fuse or breaker on the transformer primary is blown immiediately-this prevents the dist voltage from appearing in the building wiring.Occasionaly these shorts happen.Just means you have no power until the fuse and dist transformer is replaced by the power company.Bad lightening storms can do it.
 
Gabriele:

#1 Is found in all North American homes (Assuming they have electricity!)

#3 Is found in MOST homes. (But not my old apartment)!

#2 is found in all industrial and commercial settings and some larger / newer homes.

#4 Is found in larger commerical/retail/industrial settings but NOT ALLOWED in homes.

#4 Requires different wire colors (brown and golds IIRC) to differentiate it from "typical" wiring (i.e. voltages).
 
One must assume the reason behind most American homes having only 120v (or 110v, 115v) power is that by and large initial electric power use was for lighting, small appliances and then some major appliances such as fridges, and perhaps ranges. With most heat generating appliances such as dryers, ranges, ovens, hot water heaters, heating et all, running on gas or oil.

While all electric homes were found, they often were the product of power companies and government trying to get people into "modern" living, and away from the old school way.

L.
 
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