# Clamp meter voltage for 15 amps

When using my Clamp meter, i notice that it had a range in the upper 90's instead of 120 on a 14 ga - 15 amp circuit breaker. Is that low or is it because i have close to 20 duplex outlets (for now connected to it-planning to change that). Mostly tv and a computer and outlets and lights. Is that common? And if not why am i getting in the high 90's? Or should you always get between 110-120? Second questions should there be any voltage in traveler wires in a 3 way 14 ga 15 amp circuit connecting two lights?

• Are you sure the meter is good? Are the batteries in the meter fresh? How exactly are you measuring the voltage (between what points in the circuit)? Apr 26, 2017 at 10:50
• I agree with the above comments 1 more question is your meter a true RMS meter? My clamp meters have probes for measuring voltage is this the type you have? non contact voltage detection is sketchy at best. as far as the travelers yes there should be power present on 1 of the wires but the other may show induced voltages as mentioned above. Check the voltage at the panel I have found some panels FPE & zinsco to have higher than normal voltage drop in the past. 20 outlets is a lot but if not loaded beyond 15 amps the voltage should not drop as far as you are seeing. Apr 26, 2017 at 13:03
• I have never heard of quantitative measurement of voltage (more properly known as "electric potential difference") other than with probes that contact the conductor. I am more than willing to be corrected, but my understanding is that if the meter is only clamped around a wire it can measure electric current (amps) flowing through the wire, but not the potential difference (volts) between that wire and neutral or ground. Maybe this clamp has little spikes which pierce the insulation on the wire and make contact with the conductor and the meter is connected to ground? Is that it? Apr 26, 2017 at 14:15
• @larrypinsky You're doing it wrong. You have to use the probes to test voltage. Please see the Operating Instructions for the Klein Tools® CL600 (PDF). Specifically, check the section on measuring voltage Apr 26, 2017 at 14:35
• @jim Stewart there are non contact high voltage meters we use on ultra high voltages 180kv used on ion implanters, I have seen lower voltage models but they are not so good with a loaded circuit so they do exist. Note they do need a ground reference and the measurement is a specific distance from the conductor or corona ball. Apr 26, 2017 at 18:40