How do you read this smart meter?
- Thread starter Tainted
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There is a meter multiplier that you are missing. The label on the bottom of the meter would have all the information you need to get the actual values if someone would have filled it out.
You will have to call the utility company to get the value, and they will probably only give that information to the account holder so it might take a bit to get it. I am leery of using demand values that I read directly from a utility meter because I don't know how often the register is reset.
You will have to call the utility company to get the value, and they will probably only give that information to the account holder so it might take a bit to get it. I am leery of using demand values that I read directly from a utility meter because I don't know how often the register is reset.
So since no one filled it out, I can’t find the KW? Lol
JDBrown
Senior Member
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- California
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- Electrical Engineer
Unfortunately, it's going to depend on how the meter is programmed. They might have it programmed to take the CT ratio into account, but since it appears to be reading low I'd guess that isn't the case.
If the CT ratio was filled out on the label, you could multiply the meter's kW readout by the CT ratio to get the actual value. As it is, though, you're probably stuck asking the power company or getting the customer to log into their web interface (if the power company offers that).
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If the CT ratio was filled out on the label, you could multiply the meter's kW readout by the CT ratio to get the actual value. As it is, though, you're probably stuck asking the power company or getting the customer to log into their web interface (if the power company offers that).
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You could calculate it yourself if you knew the CT and PT ratios (the second and third blanks in the label), but no, you can't find the kW from the information you have now.
I opened their CT cabinet and the current transformer had a ratio 2000/4000 :5amp
I see that it’s wired to the 4000, what’s a PT?
Potential transformer
some places use them because they want no more than 120V in the meter base compartment.
I don’t think there is a PT, I could be wrong
No PT, then just (4000/5)*.91
If there’s a pt, what do I do? And where did you get .91
Dang, my dyslexia…
.19
If there’s a PT it has to be factored in also on the multiplier
So say the PT is 2.5, that gets multiplied also.
So 4000/5 CT with that PT would be mult. 2000
How do you know if you have a PT? Are they usually hidden in a CT cabinet?
Possibly, but they aren’t hidden. Too big to hide.
Whats the voltage of the XF?
what’s the voltage going to the meter?
if you looked in the CT cabinet does the meter wiring go straight to the incoming wires for voltages?
we mounted our PTs up on the side of the cabinet and CTs against the back
hillbilly1
Senior Member
- Location
- North Georgia mountains
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- Owner/electrical contractor
Just an FYI, the A B C on the display makes it easy to verify whether a power outage is on the customer side, or the utility.
I didn’t really check when I went to the site but I did see the meter wiring is monitoring the current through a bus
Good lesson here..
always snap a quick picture with your smart phone.
I take several every day I go to jobs.
A pic of the open cabinet would answer a lot of questions.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
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- Electrician
I wouldn't think there would be Pt's for a <600V service - at least I have never seen it, but hv&lv knows more than me on that stuff, could be some that do it with PTs.
One way you can find out the multiplier is if the meter gives you an instantaneous kw figure and you can clamp the service somewhere. But probably best to call power company, I agree with others that that value - you won't really know what time period it is anyway and probably not usable for NEC purposes.
I actually just got some data from SCL for two meters yesterday and they sent it without requiring owner's authorization, they sent me daily demand for a year it was pretty sweet.
One way you can find out the multiplier is if the meter gives you an instantaneous kw figure and you can clamp the service somewhere. But probably best to call power company, I agree with others that that value - you won't really know what time period it is anyway and probably not usable for NEC purposes.
I actually just got some data from SCL for two meters yesterday and they sent it without requiring owner's authorization, they sent me daily demand for a year it was pretty sweet.
Yea, well this building I was in was residential and commercial with 480V service equipment but I didn't see any transformers so it had to be a 120/208V 3 phase service. It was pretty crazy... There was like 8 sets of 500s con-ed feeders coming in the building and then 20 sets of 500s outgoing. I'm no electrician so I can't mess around with probing and clamping lol
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