Doc,
If the units have an actual load of 22 amps the ampacity of the wire must be 27.5 amps. The ampacity of a #10 THHN in a conduit with 35 other current carrying conductors is only 16 amps. You must apply Table 310-15(b)(2)(a). The required wire size is #6 if you place all 36 conductors in the same raceway.
Don(resqcapt19)
