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My Uncle is retiring and building a house in the Philippines. He wants to ship many electronics there as he can find them much cheaper here. The Philippines like many other countries uses 220. He'd like to put both 220 and 110 outlets in many of the rooms and have the 110 go through a Transformer. What are the specs he should be looking for? Brand, model recommendations?
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-Paul -
Watch for brownouts-major voltage swings
You may want to have a voltmeter permanently installed on the 120 volt line. Look at Harbor Freight for a small one under $5.00
Be sure that everyone in the household knows which outlets are 120 volt. Some of the 220 volt outlets in the Philippines use the U.S. standard 120 volt outlets.INDECISION IS THE KEY TO FLEXIBILITY -
primary power in the philipines is 220V 60 Hz.
They use combinations of plugs incluing the US style flat blade receptacles.
There's the obvious danger to 110v equipment from accidentlly plugging it into a 220v receptacle that looks exactly the same...
he needs to add up his load and get a transformer rated for that load. if he buys a set of electronics an the nameplate ratings add up to 500 W he'd better buy a transformer with a MINIMUM 500W output rating. 750 or 1000 would not be too small.
Loring in Katy, TX USA
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American 120 volt is a 240 volt transformer with a center tap taken to ground. transformers are rated in Volt-amps not watts. watts only apply in resistance circuits. motors etc. draw VA. He needs to be very aware of what he is using. AC equipment with the exception of resistance loads have the amps out of phase with the voltage the out of phase is termed power factor. that is why AC equipment is rated in VA not watts.
Ohms law is E=IR or Volts = amps X resistance
In DC circuits the power factor is 100% and is not shown in the formulas.
In AC circuits the power factor can be as low as 20% to 90% depending on the delivered load. so the AC Ohms law is Volts = amps x reactance (resistance) x power factor
I hope this hasn't confused the issue to much.Art
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