I'm looking at some electrical lighting plans and I'm having a really hard time figuring out why some of the wiring between fixtures shows 3 wires (not including ground) and sometimes 2 wires (not including ground). The homerun (which shows only two wires)indicates power is only coming off of one breaker. The lights are all 120V and the panel is 208/120. This idea of a "traveling conductor" for light switches (single pole 3-way and such) is really confusing to me and I think this is where the 3rd wire comes from. Can someone please explain how they approach the wiring aspect of electrical design and when to indicate an extra wire to the switch? Thanks for your time and I would appreciate any help.
Electrical Wiring for Lighting and Power Plans
- Thread starter pdemapan
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brantmacga
Señor Member
- Location
- Georgia
- Occupation
- Former Child
are these by any chance fluorescent fixtures w/ emergency ballasts?
peter d
Senior Member
- Location
- New England
Emergency ballasts, bi-level lighting, DALI systems all come to mind.
yes some lights have emergency ballasts some with electronic ballasts. the emergency ballasts lights controlled by one light switch the electronic ballasts from another however all on one circuit. Wow! quick response. thanks so much
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