Reading current
Reading current
(OP)
800 amp 3 phase breaker, it has (2) 500 mcm wires connected to each lug, do i clamp around both wires or each individual wire for correct amperage reading. It makes sense to me even though there are two wires to each lug that both wires act as one wire is this correct.thanks






RE: Reading current
yours
RE: Reading current
If you start feeling the urge to yank and pull on the energized cables to accomodate your clamp-on, don't do it. At least not without appropriate PPE.
RE: Reading current
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Sometimes I only open my mouth to swap feet...
RE: Reading current
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
For the best use of Eng-Tips, please click here -> FAQ731-376
RE: Reading current
RE: Reading current
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Reading current
It may give a whole new meaning to the term "Clearing time".
Please post the results.
LOL
respectfully
RE: Reading current
They are quite accurate, and can be used with any decent voltmeter, as they give a voltage output proportional to the current they measure. Also the measureable currents can be quite high (in the high thousands of amps), which makes them very attractive for switchboard work.
Most power meters now give the option of flexible current probes.
RE: Reading current
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
For the best use of Eng-Tips, please click here -> FAQ731-376
RE: Reading current
RE: Reading current
I applaud your open and honest reasoning for choosing the Rogowski coil option - "they're cooler". I don't think engineers acknowledge that enough nowadays. There always has to be a technical and commercial justification.
As an aside, we needed to measure the current in transmission tower legs during an earth test, and during a playing around stage, noticed that you can actually series the Rogowski coils up to give you extra diameter, and still measure current. With 2 in series, the measured current dropped to about 95% of the actual current, and with 3 in series, it dropped to around 85% of the actual current. So if you need a larger diameter than a single coil, you can series them up, and if you don't need overly accurate measurements, then just read the output, or you can actually calibrate the readings and apply an offset to your readings for more accurate measurement.
RE: Reading current