I am experienced in installing light fixtures but I have run into a problem I haven't before faced. The fixture I have purchased doesn't have the user friendly white a black lead wires, and instead has two solid black wires. I can't remember which connects to which. Does the grooved lead wire connect to white or black circuit wire?
If you mean one side has "ribs", this is the neutral wire.
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC. If you're on the '14 already I feel sorry for you.