According to the NEC, what's the largest size conductor we can splice with a twist-on type wireconnector? Please cite section and sub-section in your answer.
According to 110.14(B), "Conductors shall be spliced or joined with splicing devices identified for the use or by brazing, welding, or soldering with a fusible metal or alloy." My interpretation of this is that along as the connector is "identified for the use", it is acceptable. I'm not positive this is the complete answer, but it's all I've found thus far.
epimetheus got it right by citing 110.14. It was kind of a trick question, as the NEC doesn't specify the largest size, only that the method be appropriate for the intended use and installed correctly according to the manufacturer.http://www.controlbooth.com/forums/members/epimetheus.html