zbang
Senior Member
- Location
- Roughly 5346 miles from Earls Court
This came up in email conversation recently:
We often see NEMA 1-15 and 2-15 receptacles (125v & 250v 15a 2 wire) in older buildings. Has anyone ever seen a 3- or 4-? I'm told that 3- is 277v 2-wire and 4- is 600v 2-wire (from an older IATSE exam), but I'm sure I've never run into those. Has anybody (in an old factory, maybe)? Were there even made?
We often see NEMA 1-15 and 2-15 receptacles (125v & 250v 15a 2 wire) in older buildings. Has anyone ever seen a 3- or 4-? I'm told that 3- is 277v 2-wire and 4- is 600v 2-wire (from an older IATSE exam), but I'm sure I've never run into those. Has anybody (in an old factory, maybe)? Were there even made?