Originally Posted By: wdecker
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I have made test circuits, some physically twsited and then the nut put on and some just twisted with the nut. I also used different sized nuts, different gauge wire (14 and 12 AWG) and different length runs (50, 75, 100 and 125 ft). I did the testing with the help of a friend who is a master electrician and an instructor in the loocal IBEW school.
Overall, there is less voltage drop when the splice is first physically twisted with a linesman's pliers and then the nut put on.
It is very common to see new construction around here with as much as a 15 - 19% voltage drop on 2nd floor outlets in a 4200 SF house (15 amp with 14 AWG wire). NEC calls for no more than 5% at 12 amps.
The usual cause is the 'twist with nut' technique, with punch-down attachment 2nd.
Again, I don't quote, nor am I constrained by, code. Out state mandates that we call out safety hazards.
Decker Home Services
Skokie, IL 60076