{Scratches his head}Cubby964:
If these "combs" are uninsulated, and the connectors are free floating, how are they kept from contact with the enclosure?
I'll echo iwire and SvenNYC: You can only use uninsulated "combs" with properly secured terminal blocks, in my humble opinion. (I've never seen "combs" in the stores, although they are shipped with some equipment which can be connected for both single and poly-phase.)
If you have to tape them up with the jumpers in, what is the advantage over wire nuts?
I think wire nuts are not allowed in appliances: Vibration is not good for the contact between the wires, if I have understood things correctly. In Europe, you find the aforementioned terminal strips on everything from ceiling lamps to ranges. The Brits also use them instead of wirenuts, but I suspect that is just an excentric British habit.