Wire Sizing

[chiranshu]

Hi,
I have a PV System which has a 400A disconnect but the fuses are rated 350A. I am trying to do my first interconnection and need help with understanding where exactly do we interconnect for line side connections and what parameters shall be taken into account.
The utility service is going into a Siemens panel board with a 800A main breaker.
We have a AC Combiner for combining all inverters on the roof which is connected to a 400A disconnect located outside the building

1) What size wire should I use? Also do we use 90 degree or 75 degree rated wires for AC Connections. Do I have to apply the correction factors in this case?
2) What should be my point of interconnection? Should it be a tap or a splice? How can we physically do it?
When I looked into the service panel there is a spot open for wire to go in but I am not sure if we can feed our PV wires in that spot. Can I tap my wires here? I assume that it is connected to the bus bar.

I am trying to do a safe connection so just need to know all the details which should be taken into account for doing interconnections.

Thank You

 

[Dennis Alwon]

I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the performance of their job-related tasks. However, if you are not an electrician or an electrical contractor, then we are not permitted to help you perform your own electrical installation work.


If I have misjudged the situation, if for example this project is related to your work, then send me a Private Message. If you can show me that I am wrong, and that you are a licensed electrician (or at least a licensed apprentice), then I will reopen your post, and offer an apology for the delay and inconvenience.

A reminder to all members, if you see a questionable post, feel free to report it by clicking the

button at the bottom left corner of the post.