Track light with low voltage driver embedded on the head

[Piramyd]

Hi there

I am doing a commercial installation which include track light with heads including a low voltage driver 120v @0.6 A.
My 1th question is : Can I calculate the wire ampacity like that?

One track 60ft , 15 heads -----> 0.6 A * 15 = 9 A * 1.25 = 11.25 A.
With no consideration of voltage drop I would use MC 12/2, CB= 20A.

My 2th question is:
Assuming that the wire length(100 ft), from panel CB going through the dimmer and reaching the the most nearest point of the track light, which would be the run to calculate de voltage drop, 160 feet?
How to know the equivalent track AWG to calculate the track itself voltage drop ?

Thanks for any help

 

[Dennis Alwon]

220.43 may be helpful

(B) Track Lighting. For track lighting in other than dwelling
units or guest rooms or guest suites of hotels or motels, an
additional load of 150 volt-amperes shall be included for every
600 mm (2 ft) of lighting track or fraction thereof. Where
multicircuit track is installed, the load shall be considered to be
divided equally between the track circuits.
Exception: If the track lighting is supplied through a device that limits
the current to the track, the load shall be permitted to be calculated
based on the rating of the device used to limit the current.

I think that a track is rated 20 amps so I would assume 12 awg .

 

[Piramyd]

Thank you, I understand.
Now assume that I want to calculate where my voltage drop is under 3%, what length should I take,

100 ft or 160 ft ?

 

[Dennis Alwon]

Thank you, I understand.
Now assume that I want to calculate where my voltage drop is under 3%, what length should I take,

100 ft or 160 ft ?

That is a bit harder because the lights are connected along that 60 feet so that most of the load will be less than 160'. I would probably use 130' and that would work. The 3% is not an NEC requirement just a suggestion and most of the led drivers can handle quite a range in voltage.

 

[Piramyd]

Thank you very much.