CRITERIA NEEDED FOR THIS INTERCONNECTION

The example to the right shows what your setup might look like for this type of interconnection. This will be most common on town homes. Depicted is a main disconnect (MSP) attached to the meter on the exterior of the building. The sub panel is on the interior of the building most likely more than 25 feet away from the meter.

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

1. The sub panel is feeding directly from a main disconnect on the exterior of the home.

2. The sub panel has an existing main breaker protecting it.

3. load side breaker interconnection in the MSP is not possible or otherwise not preferred.

   • In the case this is a main-disconnect type enclosure with no other load side bus attached. It is direct feeding the sub panel.

4. There are at least 3 inches of feeder length to tap to from the MSP.

5. 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.

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

In this case, the interior sub panel is already protected by a main breaker rated for 200A.