baobunyum
New User
- Location
- California
- Occupation
- Engineer
I'm still learning the basics of electrical engineering (my first post here!) and I would appreciate some help! So I came across this Tesla Supercharger configuration where the utility transformer is powered at 3phase 480/277 to power several DC Fast Chargers at 480V. As you can see in the video, Tesla has also installed a step-down transformer from 480/277V 3phase to 240/120V 1phase to power a couple Level 2 chargers at 240V. My question is, would the sizing for the secondary OCPD for the 240V single phase panel be calculated as
1. Secondary Current = Transformer VA/(240V x 1.732)
OR
2. Secondary Current = Transformer VA/(240V) because it's now single phase?
Thank you!
Video Below, configuration in question is about 9 minutes in:
1. Secondary Current = Transformer VA/(240V x 1.732)
OR
2. Secondary Current = Transformer VA/(240V) because it's now single phase?
Thank you!
Video Below, configuration in question is about 9 minutes in: