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Tool Talk Discussion Forum

Watt-hour meter

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Doug-Iowa

08-12-2023 18:22:06




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Was given this meter to add to my large collection of electrical artifacts. Different than my other meters, it needs no meter socket. Direct wire under the cover on the bottom. I can't seem to find any info on it that would indicate its amp capacity. The 15 amp marking seems odd to me, the lugs would accept #2 copper easily so I think it is probably 60 or 100 amp capacity meter.


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Be nice to find installation instructions to know for sure. Any wattmeter experts around?

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Throop

08-15-2023 12:46:37




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 Re: Watt-hour meter in reply to Doug-Iowa, 08-12-2023 18:22:06  
That meter will need 240V to spin. It is an old 'A' base meter as opposed to a common socket meter of today.

Take the cover off and you will have 4 screws for wires.

Let's call them 1, 2, 3, and 4.

#1 will be 120V in, and #4 will be the corresponding 120V out.

#2 will be your second 120V in and #3 will be the corresponding 120V out.

Rich



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Dingo3

08-15-2023 14:20:01




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 Re: Watt-hour meter in reply to Throop, 08-15-2023 12:46:37  
That is not quite true. You can make a 240v work.

A pic with the cover off will help. If there is just one pot coil link you can remove the link under the cover. Energize #1 line side and check the two screws from where you removed the link with a fluke. The screw that is not energized is where you can hook up a small wire and connect it to ground. With this method you will have one wire in #1 and one out #4 and the neutral to ground. This only works with meters that have one link. If it has two it gets more involved. Im making it sound more complicated than it is but it will work. Also: you will probably need at least a 60watt bulb to make the meter spin.
The best electric meter to use for a lamp is an old 2wire 15amp one but all of them can be made to work.

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sotxbill

08-13-2023 07:09:28




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 Re: Watt-hour meter in reply to Doug-Iowa, 08-12-2023 18:22:06  
Ive got one like that but one wire in and one wire out. Seems to be a 120v meter rated at 15 amps. They were popular surface mount meters used to power the bodegos down the lane in Mexico and other developing countries.



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Dingo3

08-15-2023 14:23:02




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 Re: Watt-hour meter in reply to sotxbill, 08-13-2023 07:09:28  
Agree, 2wire 120v meter is the best option for a lamp.



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Dingo3

08-12-2023 20:49:51




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 Re: Watt-hour meter in reply to Doug-Iowa, 08-12-2023 18:22:06  
Two 120 legs in and two out. Neutral/ground was hooked up in cabinet that meter was on top of.
I would say 30amp service. Multiplier for the dials is one and the arbor gear turned 27 7/9 times to move the dial one position.



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cwtech

08-12-2023 19:45:54




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 Re: Watt-hour meter in reply to Doug-Iowa, 08-12-2023 18:22:06  
Click on the link and scroll down for info on Model MKA.

You may be able to get more info by contacting that website.



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Doug - Iowa

08-14-2023 06:57:42




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 Re: Watt-hour meter in reply to cwtech, 08-12-2023 19:45:54  
Thanks! For some reason I could find that website but not that page. Further searching shows my meter was made in 1956. I think I'll power it up and use it to run the lights in my glass insulator display case.



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