EXTERIOR- LOAD SIDE BREAKER - NEW MAIN DISCONNECT PANEL

Design

1 | WHAT THE SETUP LOOKS LIKE

SUPPLY SIDE VS LOAD SIDE REMINDER

CRITERIA NEEDED FOR THIS INTERCONNECTION

The example to below shows what your setup might look like for this type of interconnection. Depicted is a meter/main combo with feedthrough lugs to the interior sub panel. The sub panel will not accept a main breaker. An exterior breaker can still be possible but it will require us to explore some other options for protecting the feeders.

This interconnection has the following requirements that need to be met before it can be considered:

1. There is sufficient space beside the MSP to mount a new sub panel along with the PV wall equipment.

2. There are 2 available stabs to accommodate our PV breaker in the MSP.

   • If you the panel is full but the load center allows tandems you can consider this condition met.

3. There must be no code violations present in and around the MSP. 

   • If there is a plan in place to resolve code violations, then  you can consider this condition met.

4. There must be sufficient available backfeed for the amount of PV we will be landing in this load center.

Below is how this example was designed and installed redirecting the existing feeders onto a new sub panel with a main breaker:

1. The existing feeders were removed from the bottom lugs of the MSP.

2. New feeders were ran from the bottom lugs of the MSP to feed the new sub panel mounted beside the MSP.

3. The new sub is installed with a main breaker positioned at the top with lugs at the bottom.

   1. feeders were extended and spliced to the existing feeders that feed the interior sub panel.

We have now placed a main disconnect between the PV and feedthrough conductors by doing this simple sub panel add-in and splice to the existing feeders.

2 | DESIGN

BASELINE DT

Below is an example of what this interconnection design will look like in BASELINE DT.

• Ratings will vary based on what the set up is. 

  • It will be custom for every site; do not use these exact ratings if you are referring to this page to help choose your interconnection.

BASELINE CAD

Below is an example of what this interconnection design will look like in BASELINE CAD.

• Always use the exact verbiage that populates in the "Interconnection Block" on the Utility Requirements of the BASELINE DT.