NEC 690.15 PV disconnecting means, explained

Every PV system needs a clear, safe way to isolate equipment for service and emergencies. NEC 690.15 defines the disconnecting means that separates PV system equipment from the conductors, and it sets the rules for how those switches are rated, grouped, and marked. Getting the disconnect right is one of the most scrutinized items on any residential plan.

What 690.15 covers

690.15 addresses the disconnecting means for isolating PV equipment — the inverter, and any DC combiner or charge controller — from its energized conductors. It works alongside the general disconnect rules of Article 690 Part III and the interconnection disconnect requirements of Article 705. Think of it as the article that makes sure you can safely open the circuit at the equipment you need to service.

Ratings and load-break capability

The core requirement is that a disconnecting means intended to be operated under load must be able to interrupt the maximum circuit current at the system voltage. Two common device types satisfy this differently:

• Load-break rated switches and breakers can be opened while current flows. These are the default for the main PV/inverter disconnect.
• Non-load-break connectors and pull-outs (like many MC4 connectors and some fused pull-outs) are not rated to break current and must be marked "Do not disconnect under load" and only opened after the circuit is isolated.

The device must also be rated for the maximum voltage it will see — for DC circuits that means using the corrected maximum PV voltage per 690.7, not just the nameplate Voc.

The six-disconnect grouping rule

690.15 limits a set of equipment disconnects to no more than six switches or circuit breakers grouped together for a single piece of PV equipment. This mirrors the familiar "six-handle" logic elsewhere in the Code and keeps an emergency responder from hunting across a building for a seventh switch.

Location and accessibility

690.15 requires the disconnect to be readily accessible, but the exact placement is usually driven by your AHJ and utility. Many jurisdictions require a lockable, exterior disconnect adjacent to the service meter so a lineman or firefighter can kill the system from outside. Others accept an indoor disconnect. Because this varies so much, confirm the enforced local rule before you finalize the site plan — our permit guides by jurisdiction capture many of these local disconnect preferences.

How it ties into the rest of the design

The PV disconnect current rating flows directly from your conductor and OCPD sizing. If you size the inverter output circuit conductor and breaker per 690.8 and 240.6, the disconnect simply has to match or exceed those ratings. Under-rating the disconnect is a fast rejection.

As always, OneLine Studio is a design aid, not a permitting authority. Verify the enforced NEC edition and any utility disconnect amendments with your AHJ, and have a licensed electrician or PE review, sign and stamp the plan before filing or energizing. For a full picture of what belongs on the drawing set, see what is in a solar permit set.

Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.