The link below is to the CBEMA curve that is used for equipment design to allow for typical tolerance on the voltage. There is a tolerance and the actual measured voltage is rarely exactly volts. A common reading at my house is volts. Industrial motors are made and rated in multiples of V , , , and Vac for use on line voltages in multiples of V , , , and Vac. A Volt motor will not be harmed when placed across a v line. The motor was rated at v and will conform to the data on its nametag at Vac.
It may have a bit more torque at higher voltages. The difference in the two voltage series is to allow for line drop. A fully loaded motor on a V line may have only V at the motor terminals when there is significant line drop. The line frequency for the US power grid is classed ok for clocks. However, there is a little known feature which is the frequency may vary throughout the day within acceptable limits. The frequency of the US grid is quite good, but it is not as precise as one might think.
The only commitment by a power company is that it will deliver the correct number of cycles in a 24 hour period. For any given minute, the number of cycles may be more or less than 60 x 60 or cycles per minute. Years ago, the way the power station at the University of Illinois did it was to run two clocks: one ran from the power station and the second was slaved to WWV, the national time standard. When the station operator saw that the station clock was falling behind, he'd adjust the governors upward and vice versa if he saw the power station clock running ahead.
I'd assume that process is fully automated these days, but this example was given to demonstrate that the line frequency can and does vary. Indem Sie weiterhin auf der Website surfen bzw. Mehr erfahren. Ultimate Lighting Sale. Bathroom Vanity Sale. Bestselling Chandeliers and Pendants. Sign In. Join as a Pro. Houzz TV. Houzz Research. Shop Featured Holiday Categories. Home Decor. Holiday Decor. So I apologize in advance for newbie questions! I did search the old threads, but didn't see this particular issue addressed.
Our inspector, using a Sure Test circuit analyzer, found that the bulk of the outlets measured volts, with none more than volts. Not good! The power company Alabama Power, part of Southern Company has been out and says the voltage is "within tolerance with no abnormalities. We're dealing with a ca home with an underground service line with a run of up to feet not sure exactly where the transformer is.
I'm guessing I need to confirm where they tested at transformer? And I also want to know what their promised delivery voltage is, so I can understand how their "tolerances" work. What else should I ask? Not looking forward to pricing install of a new ' line, but if that's the likely culprit, I need to go ahead and price it before we ink the deal for the house.
It's a bit low, but I'd say you're fine. Some may disagree, but I wouldn't worry unless you see it go below for an extended period of time. Try testing at different times. Testing voltage in the heat of the day may show a lower than normal voltage because of neighbors' heavy use of aircon. Same with a very cold night in winter.
Just make sure that you don't have some recepts appreciably HIGHER than v while others are lower - that would indicate a loose neutral, a serious problem.
Regarding the time of testing, this inspection occurred from pm on a June day in Alabama. I need advice on using cafe doors for a walk-in closet. This or That - New Construction vs. Century Club? Countertops and their evolution. POLL: Does your family live in your kitchen? As davidr suggested, it might have had something to do with the time of the day. If it was me buying, I would want to do 3 or 4 more tests on different days and times of the day. Suppose on your next test you get ? In other words it's pretty hard to tell from one test.
Did your first test give you the lowest possible reading or the highest? I had a similiar situation - my backup power supply on the computer started beeping one day, which it does when the power goes out, or if there is a surge or sag in voltage. It kept doing it, and I measured the voltage - about I pulled the cover on my main panel, and checked the leads coming in - both were - I went to my neighbor's and checked his voltage to rule out a problem in my meter socket, and his was the same.
I should mention this was a cold day in January - when the electric gris is under heavy load I am sure. As davidr said, it could just be at peak demand times hot day, lots of AC units? If the incoming wires are not sized properly for the voltage drop your going to have a little trouble for a long time.
What are the loads in the house Sq foot heat water heater ect. The length of the service conductors is not a factor if the voltage is measured with no real loads on the service. Greater amperage draw increases the voltage drop. If the voltage is low or near the low end of acceptable with no load AND the service conductors are long, the voltage could become unacceptably low with heavier loads. Turn on lots of stuff and measure the voltage under those conditions.
All of these answers are pretty accurate. First your state regulatory, if your utility is regulated, will have service delivery standards for voltage to the customer.
Other things effecting this , assuming your service conductors are ok in size would be how many other customers are on your same transformer? Time of day has an effect when looking at the total load of the transformer. Some times the transformer will have taps that can be changed to increase the voltage delivered or they can change the voltage to the transformer thus increasing the secondary voltage to your home.
Could be the utility line is loaded and needs to be replaced and upgraded. Most utilities will set a PMI Power Monitor Instrument that records the voltage and amperage delivered and consumed by your home. There are many things that come into play here and all of these answers indicate those issues. I would start with your utility and try to record your consumption at your panel ahead of the main breaker. Then ask for a voltage test at the transformer secondaries feeding the home, then again at your house.
Most likely your on the end of a utility high voltage circuit with several customers on it or the same transformer. Now that being said what you need to watch out for if all this is true is voltage spikes. Thats is when the loads that are bringing the voltage down are removed and the voltage rises. Start with the recorder.
If it remains outside of that range for an extended period of time, then they must take steps to correct, or if like in California, simply ask the states reg committee for a temp variance and notify their customers of the upcoming brown outs.
I just pulled up the specs for a Sure Test Circuit analyzer. The accuracy is stated as 1. The AC voltage range is 85 to v. Assuming they mean full range, the accuracy is 2. If it hasn't been recalibrated in a while it could be off by even more. Since Brickeyee said it was within tolerance, and the poco said it was fine I wouldn't worry about it. Also Know, what voltage is too high for homes? If you find that the voltage at your wall outlets is consistently around VAC or higher , then you have too much electricity in your house and you are using and paying for significantly more energy than your appliances need.
These days, almost every residential customer can get volts from their wall outlet. However, power is typically delivered into your home at a nominal voltage of volts. We talked briefly about the volts that is supplied to your home from the power company.
If you plug a V device into V outlet, it will normally last a little longer before it dies. But: An AC mechanical drive may fail to start, or it may take up more current than it is designed for, and eventually burn out.
The insulation is usually not a problem unless there is a major flaw in the design. You can use your electric appliances in the United States of America , if the standard voltage in your country is in between - V as is in the US , Canada and most South American countries.
Can I plug a v into v? If they stall it may up the current some but in general it won't work well if at all. Do I need a voltage converter? Electrical outlets in the U. Not all gadgets require a voltage converter, though—you may be able to get by with just a simple plug adapter. If your device doesn't support dual voltages, you'll need a converter. Why does US use volts? Once AC was widely accepted as being superior to DC for power distribution, V became the standard for AC distribution presumably because it used the "safer" Voltage level of the DC system.
After metal filament lamps became feasible, V became common in Europe because of the lower distribution costs.
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