Plano12345
Member
- Location
- United States
Hi all. You all have really helped me a few times, and I'm hoping you can help me one more time.
On a project I'm working on, there are lights for aesthetic purposes being proposed at various locations along the corridor. The electrical services being used are a 240/480 variety. After talking with construction, they have decided on using 120 v/ 75 w lights.
The lighting contractor is stating that for every location of these 120 v/ 75 w lights, we have room to install a small transformer to drop down to 120 volts. In this design, all of these 120 v lights are installed on the same circuit breaker at the proposed electrical service (with no other light fixtures on them).
While I'm familiar with some basic design, I'm not familiar with installing a transformer between a service and a light fixture when it comes to voltage drop calculations. To pick out the correct transformer size, I'm assuming it's no different from figuring out an electrical service. Also, what do I use for voltage drop/current a) from the service to the transformer and b) from the transformer to the light fixture?
I'm just making sure I'm setting up the proposed electrical service with the correct current for the circuit breaker.
For the sake of math, I have 5 light fixtures at 120 V / 75 W, each with their own transformer to drop from 480 volts to 120 volts. What current should I be using at the main electrical service for the breaker?
On a project I'm working on, there are lights for aesthetic purposes being proposed at various locations along the corridor. The electrical services being used are a 240/480 variety. After talking with construction, they have decided on using 120 v/ 75 w lights.
The lighting contractor is stating that for every location of these 120 v/ 75 w lights, we have room to install a small transformer to drop down to 120 volts. In this design, all of these 120 v lights are installed on the same circuit breaker at the proposed electrical service (with no other light fixtures on them).
While I'm familiar with some basic design, I'm not familiar with installing a transformer between a service and a light fixture when it comes to voltage drop calculations. To pick out the correct transformer size, I'm assuming it's no different from figuring out an electrical service. Also, what do I use for voltage drop/current a) from the service to the transformer and b) from the transformer to the light fixture?
I'm just making sure I'm setting up the proposed electrical service with the correct current for the circuit breaker.
For the sake of math, I have 5 light fixtures at 120 V / 75 W, each with their own transformer to drop from 480 volts to 120 volts. What current should I be using at the main electrical service for the breaker?