SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/elec-clamp-single-conductor

When measuring current with a clamp meter, how many conductors should be inside the jaws?

Clamp around a single conductor.

Start playing free

  1. One ✔
  2. Two, hot and neutral together
  3. All conductors in the cable

Why: The clamp reads the magnetic field around the wire. If the hot and neutral are both inside, their fields cancel and the reading is near zero.

Huh, didn't know that: Fluke also says to make sure the jaws are completely closed before taking a reading.

The dad joke
How does a sparky become a superhero? Just amps up.
Like this card?
Play the game

References

Answer: One. The clamp reads the magnetic field around the wire. If the hot and neutral are both inside, their fields cancel and the reading is near zero.

  1. Fluke: How to Measure Current with a Clamp Accessory www.fluke.com/en-us/learn/blog/digital-multimeters/how-to-measure-current-with-clamp-accessory
    Enclose a single conductor inside the jaws.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Trades & ShopTo measure the voltage across a device, how is a voltmeter connected?Trades & ShopTo measure current with an in-line ammeter, how is it connected to the circuit?Trades & ShopFluke says to check a voltage detector on what before and after each use?

That's stuff everyone should know.