Solar Labels and Placards: The Full Set an Inspector Checks
By Seamless Home Team, Solar fulfillment operations · September 2, 2026
Quick answer
A residential PV solar system carries a set of permanent labels, not one label, and each is driven by a different code requirement. The usual schedule is: a marking identifying the PV system disconnect, a plaque or directory at the service equipment showing all power sources on the premises, a marking at the point of interconnection giving the inverter's rated AC output current and nominal AC voltage, a warning at a load-side breaker telling anyone working in the panel not to relocate it, markings on PV circuit raceways and enclosures identifying them as a photovoltaic power source, and a rapid shutdown placard at the service equipment or the initiation device. Where there is a battery, the energy storage system adds its own markings. All of them have to be permanent, machine-produced, weather-durable in the location they occupy, and formatted to the warning standard the code references, which is why handwritten or paper labels fail even when the wording is right. Section numbering and the exact placard format have moved between code editions, so the label set is only correct against the edition your jurisdiction has actually adopted.
Labelling is the cheapest work on a PV solar installation. A complete label set for a residential system costs less than an hour of crew time. It is also, alongside rapid shutdown itself, one of the most reliable ways to fail a final inspection on a system that is otherwise built correctly.
The reason is structural rather than careless. There is no single labelling section in the code that an installer can read once and satisfy. The markings on a finished system are required by half a dozen separate provisions, written for different reasons, addressed to different readers, and renumbered between editions. A crew can satisfy five of them and miss the sixth, and the sixth is the one in the correction notice.
Six requirements, one label set
It helps to stop thinking of this as "the labels" and start thinking of it as a schedule, where each line exists to tell a specific person something specific at a moment when they need it.
| Marking | Who it is for | What it tells them |
|---|---|---|
| PV system disconnect identification | Anyone approaching the equipment | Which switch isolates the PV system, and that it is the PV system rather than a general circuit |
| Service equipment plaque or directory | A responder or electrician killing the supply | That the utility supply is not the only source of power on the premises |
| Point of interconnection marking | An electrician working in the panel | The inverter's rated AC output current and nominal AC voltage |
| Load-side overcurrent device warning | An electrician reorganising the panel | Not to relocate that breaker, because the busbar calculation depends on its position |
| PV circuit raceway and enclosure identification | Anyone opening a conduit, box or enclosure | That the conductors inside are a photovoltaic power source and may be energised |
| Rapid shutdown placard | The fire service, on arrival | That the building has PV with rapid shutdown, and where to operate it |
Read down the "who it is for" column and the logic of the set becomes clear. Every one of these markings exists because somebody will one day approach this equipment without the benefit of the drawings, and the label is the only thing that will tell them what they are looking at.
The load-side warning is the one whose purpose is least obvious, so it is worth stating plainly. Where an inverter is connected to a load-side breaker in an existing panel, the compliance of that connection can depend on where the breaker sits on the busbar. Move it, and the calculation that justified the installation no longer holds. The label is there to stop a future electrician quietly invalidating the system while tidying up a panel. It is the same arithmetic that governs the 120% rule on a service panel.
Where the system includes a battery, the energy storage equipment brings further markings of its own, which is one of several reasons a battery changes what an inspector checks on the system.
Permanence is a requirement, not a preference
The most common labelling defect is not a missing label. It is a label that exists, says the right thing, and does not count.
The code requires these markings to be permanent and suitable for the environment they occupy, and warning labels specifically have to meet the referenced warning-sign standard, which governs wording, colour, symbol and layout rather than merely content. That combination rules out a surprising amount of what turns up on finished systems:
- Handwriting and marker pen. Not a specified format, not weather-durable, and treated by most inspectors as equivalent to no label at all.
- Office-printed paper, laminated or otherwise. Inkjet and laser output is not ultraviolet stable and paper is not weather-rated.
- Tape of any kind, including labelled masking tape and electrical tape written on with a pen.
- Stickers that have already curled in the carton, which fail on adhesion before anyone assesses the wording.
What passes is unglamorous: engraved plates, engraved plastic laminate, or machine-printed labels on exterior-rated vinyl or polyester stock. Across a whole system the difference in cost is small enough that using anything else is a false economy, particularly measured against a re-inspection.
Location is judged by whether the right person will find it
Two markings in the set are routinely fitted somewhere defensible and still fail.
The rapid shutdown placard is the main one. It belongs at the service equipment or at an approved readily visible location associated with the initiation device, and the test an inspector applies is not whether the placard is somewhere reasonable but whether an arriving firefighter will see it. A placard on the inverter enclosure inside a garage fails that test in most jurisdictions even where an edition's wording could be read to permit it. The rapid shutdown requirement itself is a firefighter safety rule, and inspectors apply the labelling that goes with it in the same spirit.
The service equipment directory is the second. It has to be at the service equipment location, legible from where somebody would stand to operate the disconnect. Inside a dead-front, behind a cover, or on the reverse of a panel door does not achieve that.
There is a related trap on the exterior of the building. Equipment placement can satisfy the labelling requirement and then defeat it, because a placard mounted where conduit crosses it, or facing a wall in a tight equipment run, is not legible in situ. This is worth catching at design rather than at inspection, and it is one of the things a careful site survey can record before the equipment layout is fixed.
The edition problem
Every statement above is subject to one qualification: the label set is only correct against the code edition your jurisdiction has actually adopted.
This is not a technicality. The specified format of the rapid shutdown placard changed between editions, including the diagram it must carry. Section numbering has moved. Requirements that were in one section have been redistributed to others. The consequence is that a label printed from a template that was correct three years ago can be present, permanent, legible, correctly located, and still rejected.
Adopted editions vary between neighbouring jurisdictions and lag the published code by years, so which edition applies to a given project is a question with a local answer, decided by the authority having jurisdiction. Where a project is in a jurisdiction the team has not worked in before, confirming the placard format at plan review is substantially cheaper than discovering it at final inspection.
The same applies to additions. Extending an existing array is generally assessed against the edition in force for the new permit, which can require the entire label set to be brought forward even where nothing about the original installation was wrong when it was built. A design change part-way through a project can have the same effect, because a changed inverter alters the point-of-interconnection marking.
Where labelling sits in the paperwork
Labels are physical, but the requirement is documentary first. The label schedule belongs in the plan set that goes to plan review, showing each marking, its wording and its location. Two things follow from getting that right.
The first is that plan review becomes the place where a format problem surfaces, which is the cheap place for it to surface. A reviewer who queries a placard format has cost you a resubmission rather than a re-inspection, and the rejection reasons at plan review are generally faster to clear than a correction notice on a finished system.
It also means the label set can be confirmed against the drawing before the visit is booked, alongside the rest of what the inspector will look at.
The second is that the crew fitting the labels is working from a drawing rather than from memory. Labelling is usually done at the end of the installation day, by which point the crew is finishing up and the label set is the last thing between them and leaving. A schedule on the plans is what stops the sixth requirement being the one nobody remembered.
If your jurisdiction requires a special inspection on any part of the work, expect the markings associated with that scope to be looked at with more attention rather than less.
The bottom line
Labelling fails for boring reasons: one requirement of six overlooked, a permanent marking that is not permanent, a placard where the installer would look rather than where a firefighter would, or a template that was correct under the previous code edition. All four are visible in a photograph before an inspector is ever booked, and all four are cheaper to fix on the ground than in a queue.
Confirming the placard format and location with the jurisdiction at plan review, specifying exterior-rated label stock, and carrying the label schedule on the plan set removes most of the failure surface. Read the label schedule alongside the other four things an inspector looks at, so a system is scored before the visit is booked rather than after. Where a project runs across unfamiliar jurisdictions, that confirmation is the part worth doing deliberately rather than assuming.
Seamless Home handles design, permitting and inspection coordination as part of design and permitting, which includes carrying the label schedule on the plan set and confirming local placard requirements before a crew is scheduled. Coverage is confirmed per service area rather than promised as blanket availability. If you are dealing with repeat labelling corrections across jurisdictions, get in touch and we can look at where they are originating.
Frequently asked questions
What labels are required on a solar system?
The set is driven by several separate code requirements rather than one labelling section, which is why partial label sets are so common. In a typical residential PV solar installation you would expect: a marking identifying the PV system disconnecting means, so that anyone approaching the equipment knows what it isolates; a permanent plaque or directory at each service equipment location showing all sources of electric power on the premises, so that a responder switching off the utility supply knows a second source exists; a marking at the point of interconnection stating the inverter's rated AC output current and the nominal AC operating voltage, which is the information an electrician needs to size and verify the connection; a warning at a load-side overcurrent device instructing that it must not be relocated, because moving it can defeat the busbar calculation that made the connection compliant; identification of PV circuit raceways, junction boxes and enclosures as a photovoltaic power source, at intervals and at every point where the circuit could be opened; and a rapid shutdown placard at the service equipment or at the shutdown initiation device. Batteries and energy storage equipment carry further markings of their own. The precise wording, format and section numbering depend on the code edition in force for your permit.
Why did my solar system fail inspection on labelling?
Almost always for one of five reasons. The label is missing entirely, usually because one requirement in the set was overlooked while the others were satisfied. The label is not permanent: handwritten, marker pen, printed paper, tape or a sticker that has already curled, all of which fail a durability requirement regardless of whether the wording is correct. The label is in the wrong place, most often a rapid shutdown placard fixed at the inverter when the jurisdiction wants it at the service equipment where the fire service will look. The format is wrong for the adopted edition, which happens when a label is printed from an older template and the specified layout or diagram has since changed. Or the label is unreadable in situ, faded by ultraviolet exposure, painted over, mounted behind conduit, or facing a wall. None of these are engineering problems and all of them are visible in a photograph, which is why a labelling failure is the most avoidable correction notice on a PV solar project.
Can solar labels be handwritten?
No, and this is the single most common labelling defect on otherwise clean installations. The code requires these markings to be permanent and suitable for the environment they are installed in, and warning labels specifically must meet the referenced warning-sign standard, which governs wording, colour, symbol and format. A handwritten label satisfies none of that: ink is not weather-durable, handwriting is not a specified format, and a marker-pen legend on an enclosure lid is not a permanent marking. In practice inspectors treat a handwritten label as an absent label. The same reasoning rules out office-printer paper, laminated printouts, masking tape, and the blank adhesive labels that come in some equipment cartons. Engraved plates, engraved plastic, and machine-printed weather-rated vinyl or polyester labels are what pass. The cost difference across an entire system is small enough that using anything else is a false economy.
Where does the rapid shutdown placard go?
At the service equipment, or at an approved readily visible location associated with the rapid shutdown initiation device, and the choice is not the installer's to make unilaterally. The placard exists so that arriving firefighters know before they touch anything that the building has a PV system with a rapid shutdown function and where to operate it, which means it needs to be where they will actually look, and that is the service equipment or main disconnect on the outside of the building. Fixing it next to the inverter in a garage satisfies the letter of some editions and still draws a correction in many jurisdictions, because a responder is not going to find it there. The format matters as much as the location: later editions specify a particular layout, including a simplified diagram distinguishing which conductors remain energised inside the array boundary from those that do not, together with required wording and colours. A placard printed from an older template can be present, legible, permanent and still wrong. Confirm both the location and the format with the authority having jurisdiction before the labels are ordered.
Who is responsible for solar labelling on a subcontracted install?
The licensed contractor whose permit the work sits under carries the code obligation, whoever physically fitted the labels. That is the party the jurisdiction corresponds with, the party a correction notice names, and the party that has to produce a compliant label set and stand for a re-inspection. Where a sales organisation contracted the homeowner and a different entity holds the permit, the homeowner-facing party owns the relationship and the delay, but not the compliance duty. The exposure worth papering in advance is the gap between those two positions: which party buys a replacement label set, who pays a re-inspection fee, and who absorbs the schedule slip when a placard is wrong. That belongs in the subcontract rather than in an argument once the notice has arrived, and it is one of the specific items worth naming when you set out what a subcontract should cover.
Do labels change when panels are added to an existing system?
Frequently, and it catches people out. Work on an existing array is generally assessed against the code edition in force when the new permit is applied for, not the edition the original system was built to. That means an addition can require the whole label set to be brought up to the current edition, including a rapid shutdown placard in the current specified format on a system that was originally compliant without one, and an updated point-of-interconnection marking because the inverter's rated AC output current has changed. The service equipment directory may also need revising to reflect the altered installation. Whether the requirement lands only on the modified portion or on the entire system is an interpretation that varies by jurisdiction. The practical consequence is that the labelling line item on a small addition is not proportional to the size of the addition, so it belongs in the quote rather than in a later conversation with the customer.
How long do solar labels last outdoors?
A properly specified label should survive the life of the equipment it is fixed to, but the failure mode worth planning for is ultraviolet fade rather than physical loss. Labels on south-facing exterior equipment in a high-sun climate lose contrast years before anything else on the system shows wear, and a faded placard is a non-compliant placard: the requirement is that the marking is legible, not that it was legible on the day of inspection. This matters at two points after handover. It matters at a service visit, because a technician arriving at equipment with unreadable markings has lost the information the labels exist to convey. And it matters on resale, because a home inspection can flag illegible safety markings on a system that passed its original inspection cleanly. Specifying exterior-rated, ultraviolet-stable label stock at install is the cheap answer. Checking the placards during any service visit is the free one.