(quote)"If you are feeding a subpanel(50-125 amp) from a main service panel(200 amp) , do you need to have 4 wires to the sub panel?"
Correct me if this is wrong here guys, but my continuing ed instructor often illistrates a sub-panel in a seperate building (garage) using a 3-wire feed from the main panel(no equipment ground). The heading under this illistration reads "permitted but not recommended".
The illistration clearly shows the feeder wires originating at a 2-pole breaker inside the main panel, not from a meter socket. It also shows the main bonding jumper installed in the sub. I'd like to clear this up.
Can anyone quote an article number where it states that "all" sub-panels must be fed with a 4-wire feed? Can anyone quote an article where the code even uses the term "sub-panel"? Matt
