A type of current transformer used as a metering device. You clamp the tong around a wire and it will tell you how many amps are flowing though it.
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Yes but the meter has to go in series with the load. There is a new clamp on amp meter being introduced, that will measure larger DC amperages without opening the circuit.
Ammeters (amps) An Ammeter is a meter for measuring electrical current, the unit of which is the Ampere (amp)
If the amp meter is in series ahead of the first parallel branch of lamps the meter will read an increase in current.
yes The meter rating is the maximum, if you use it on a smaller service that is OK from a code point of view. However, the local utility company may also have special rules about which meters pans can be used on which type installations. You may need to check with them
If you have the right test equipment amps are the easiest to measure. A slip over the wire amp meter is easier to use than a clamp on amp meter. The other two values have to be measured by using test leads from the test equipment.