I'm sorry but I have to strongly disagree on this one, especially the way "temporary" can get to be a pretty long time. You wouldn't be doing a valid test because the substituted breaker wouldn't have the same sensing as the suspect breaker. I would check to see if they got an Amptector or other test unit when they got their switchgear. Get someone in to do the prescribed maintenance for the breaker. You can verify the long time, short time, instantaneous, and ground fault trip settings. Sometimes the switches on a trip unit getting exercised will end up fixing the problem. We switch between the different sensing circuits (A,B,C) for the different tests so we make sure we use each one at least once. In your case, I would go through each test, 3 times. If nothing else, note all the multiplier and delay settings, exercise the pots & switches, and put them back to where you found them.
Joe
