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Fixture to safely measure mains AC amperage

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nightfire:
For spontaneous measurements of mains current a standard current clamp is the best way to go.
Especially considerung that the area you are probably working at is CAT III or even CAT IV, a current clamp also protects you due to the galvanic isolation.

For permanent installation, some power converters exist, that are clippable around the hot wire(s). Depending on the type, on the secondary you can get whether current or voltage.
Mostly those are used to interface to stationary meters, but there are also add-ons for multimeters, like the Fluke i410- here the current gets measured and presented to the DMM as voltage.

NoisyBoy:
In the US, I use the orange splitter HKJ suggested, along with a Fluke 375 FC for 2% accuracy +/- 5 digits,  Since you requested “safely” in your question, it is by far the safest way to do the measurement, not to mention the ability to log and monitor with Fluke Connect remotely for utmost safety.  With the flexible loop, it can handle up to 2500A, it is higher than anything I would want to get close to.

trobbins:
Are you wanting to take visual ad hoc measurements, or continuous high rate, or auto logged, or ....

fazalmajid:
I am trying to calibrate IoT power plugs with power metering function (2Nice/Gosund UP111) running the Tasmota open-source firmware, using a calibrated multimeter (or inline power meter) as a reference. So I would put a purely resistive load like heat lamps (since incandescent bulbs are hard to get now) on a dimmer, change the dimmer until I get 10W, 20W, 30W etc on the calibrated meter, then plug it into the UP111, see its readings and tabulate them. Of course inductive loads and power factor correction introduce another wrinkle.

fazalmajid:

--- Quote from: HKJ on June 05, 2022, 04:22:12 pm ---In US you can get this adapter for clamp meters:



But I have not seen it in Europe.

--- End quote ---

Thanks, HKJ! I am a big fan of your battery and charger reviews.

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