measuring current in a 220 ac circuit

Nope -- 180 degrees.

You're wrong.......if the two hot legs were 180° apart, they would cancel each other. There would be 2 currents in 2 directions cancelling, or partially canceling each other. This happens in a center-tapped neutral, but not with the hot legs. Dis-regarding the neutral connection on std. 120/240V center-tapped service, the 2 hot legs are simply the ends of the secondary transformer coil with a 240V RMS sine wave. To be 180° out of phase you need two sine waves - where is the other one? (Remember, we are disregarding neutral - per your insistance)..........

There is a lot of mis-information in the other posts. The answer to your question is you can use one meter. You need to pass both hot leads through the clamp on meter, but one hot lead has to pass through in the "reverse direction". This may be hard to arrange with heavy wires.

Now the meter will give an indication of the 110V current. If you have 10 Amp 110V load on one hot lead the meter will read 10 Amps. If you have a 10 Amp 220 load, the meter will read 20 because you are using 10 Amps in both hot leads. If you have a 10 Amp 110 V load on the other hot lead, the meter will read 10 Amps.

Have fun Mark

According to Tony :

Every Canadian house built within the past 40 years, with the exception of the last two, is performing this "experiment" _every_ day. Because our kitchen counter outlets are ALL wired this way.

The neutral carries the difference current. It doesn't add.

If it added, half our homes would have burned down by now.