120v 240v


  #1  
Old 01-14-04, 07:31 PM
dennist 1
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120v 240v

Also I,ve lived in 4 states I.ve heard 110v 115 , 120 , also 220 230 240 pertaining to the size of circuit. why is it ?? what is really the 2 right ones ?
 
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Old 01-14-04, 07:44 PM
J
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All are correct. Different power companies supply slightly different voltages. Appliance manufacturers design their products to work on any of these voltages. The electrical codes assume 120 and 240 as the nominal voltages.
 
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Old 01-14-04, 07:53 PM
dennist 1
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Thanks john makes sense.
 
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Old 01-14-04, 08:13 PM
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Adding more confudion to the picture, sometimes the utilities will decrease the voltage during periods of high demand (hot summer afternoons), meaning everyone will see slightly lower voltages. This enables them to supply more power.
 
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Old 01-15-04, 07:06 AM
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Also, most appliances, motors, etc are rated to handle set voltages plus or minus 10 percent to cover this difference.
 
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Old 01-16-04, 06:21 AM
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Also, if you are served by a 3-phase system (not common in most residential situations) you'll see numbers like 208 pop up.
 
 

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