MSMStannyl
Member
- Location
- Baltimore, MD
So I'm working on a design for low level pedestrian style lights along a section of bike trail that goes through the center of a town. Per the lighting calculations, we'll probably need about 74 light fixtures to cover this long stretch. I've broken these up into 3 segments (based on a bridge, and major road crossings) which will each get their own 277V/480 service.
Obviously for runs this long, I will design using the 277V single phase to the lights. However, the client has mentioned possibly wanting to add receptacles at the bottom of each pole. I'm not sure about the exact reason for this but I've started looking into this and am trying to figure out the best way. The receptacle obviously needs 120V power.
I've contacted one of our lighting reps to see if they make poles with receptacles that might have a built in step-down transformer. Something small that sits inside the pole. I've never seen one myself but I can't imagine I'm the first person with this dilema. My concern here is cost. I can't fathom this will be a cheap way to go, especially considering we would need 74 of them.
The other idea I had was to provide a transformer at each service (so we would have 3 of them) and run dedicated 277V lighting circuits out to the lights and then seperate circuits (for the receptacles) through the transformer and then out to the poles. The obvious problem here is that you're stepping down to 120V at the service location and then having to make long runs down the line to the poles. Voltage Drop would be killer and I'd need some pretty big wires.
Anyway, that's pretty much where I am right now. I'm trying to get definitive direction on these receptacles. I'm thinking that once the client realizes the cost implications, the receptacle idea will be scrapped. Just curious if anyone has dealt with something similar and what their solution was.
Thanks!
Obviously for runs this long, I will design using the 277V single phase to the lights. However, the client has mentioned possibly wanting to add receptacles at the bottom of each pole. I'm not sure about the exact reason for this but I've started looking into this and am trying to figure out the best way. The receptacle obviously needs 120V power.
I've contacted one of our lighting reps to see if they make poles with receptacles that might have a built in step-down transformer. Something small that sits inside the pole. I've never seen one myself but I can't imagine I'm the first person with this dilema. My concern here is cost. I can't fathom this will be a cheap way to go, especially considering we would need 74 of them.
The other idea I had was to provide a transformer at each service (so we would have 3 of them) and run dedicated 277V lighting circuits out to the lights and then seperate circuits (for the receptacles) through the transformer and then out to the poles. The obvious problem here is that you're stepping down to 120V at the service location and then having to make long runs down the line to the poles. Voltage Drop would be killer and I'd need some pretty big wires.
Anyway, that's pretty much where I am right now. I'm trying to get definitive direction on these receptacles. I'm thinking that once the client realizes the cost implications, the receptacle idea will be scrapped. Just curious if anyone has dealt with something similar and what their solution was.
Thanks!