120 Or 240 Volt, Difference In Meter Reading? - Electrical - DIY Chatroom Home Improvement Forum


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Old 06-01-2010, 11:46 AM   #1
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120 or 240 volt, difference in meter reading?


I am installing a new pool pump soon, and the information I was seeing before ordering said it could be hooked up to 120 or 240 volts.

This is a pretty beefy motor, so it is likely that it would be the largest 120 volt aplience when running. whould the resulting imbalace in electrical legs (half of the 240 volt circut) cause a higher watt reading on the electric meter?

basically what I am asking is if a 120volt 20 amp draw would be read by the utility meter the same as a 240 volt 10 amp draw?

I am leaning towards hooking it up in 240 just for reduced loss due to resistance in the wireing.

could I possibly hook it up to the 240 volt terminals and stick in a multi pole switch to run it in 240 or 120 volts to give me the option of a half power setting? They do make 2 speed versions of this pump, but I couldn't justify the extra couple of hundred they charge for them. Can I get it free?

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Old 06-01-2010, 11:56 AM   #2
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120 or 240 volt, difference in meter reading?


The meter will read it the same way.
You can either connect it to 120volts, or 240 volts, but not both.
You can not get two speeds from a single speed motor.

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Old 06-01-2010, 01:23 PM   #3
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120 or 240 volt, difference in meter reading?


Watts is watts. It doesn't matter what the voltage is. 240 is a bit more efficient since there will be less voltage drop do to lower current.
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Old 06-01-2010, 03:10 PM   #4
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120 or 240 volt, difference in meter reading?


Thats what I figured, but I wasn't shure there wasn't something like a PCF at play with the meter.
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Old 06-01-2010, 04:45 PM   #5
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120 or 240 volt, difference in meter reading?


Quote:
Originally Posted by forresth View Post
Thats what I figured, but I wasn't shure there wasn't something like a PCF at play with the meter.

the 240 also allows for lower rating of circuit and due to that, often a smaller size of wire. Smaller wire generally costs less. It's not as applicable in a resi situation but does sometimes come into play.
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