You're getting there.it depends upon the appliance.... righto ???
That's an interesting concept, where in the world does this apply Alberto?The maxim current you can use, will depend from the type of contract you have signed with the power company. I have a 3KW contract and 220 volts @ 50 Hz single phase. Maximum current I can use is 15 Amps (since there is a 10% allowance)
After that the breaker will cut me off.
studiot, I am pretty sure that if you read more carefully the contract you have signed with your power company, you will notice that a power limit is there. Very likely not in Ampers but in KWatts.
Think logically, if no limits apply, the power company will need to use huge wires for every houses, also for the one that will light only a few candels bulb for few hours a day.
The main intrinsic limitation to the maximum current you can draw is with the cable size that connect your house to the nearest distributing sub-station.
You will pay, as I do, KWh consumption, which is ralated to current but not the same thing.
Answering to your question, I am living in Italy.
Here 2 phase 220VAC is the norm, with each phase providing several 120VAC wall outlet legs. The 220AC is saved for the heavy appliances, such as the stoves, laundry dryers, and AC.
You're right, it was a brain fart on my part. The term used is split phase electric power. You have to love Wikipedia.I think it must be single phase 3-wire system (2 hot legs & 1 neutral). This might be derived from the three phase distribution systems which is then segregated by pole-mounted drum type single phase transformers, the secondary of which is single phase 3-wire type.
220VAC is available between the outer 2 hot legs (for heavy loads) and 120VAC is available between either hot leg and the centre neutral wire. When one says 2-phase system then it would mean the 2 phases are 90 elec. deg. out of phase w.r.t. each other. Also, the neutral wire would carry a continuous out of balance current of √2 times the current in either of the outer hot legs...and as such this might not occur in the case you mentioned above! A single phase 3-wire system neutral carries current only when the loads between outer hot legs and neutral wire are un-balanced and not continuously as is the case in a 2 phase 3-wire system.
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