Solar & PV Labeling: NEC 690 and 705 Marking Requirements

A solar installation can require anywhere from a dozen to well over a hundred labels and placards, all mandated by the NEC to protect first responders and maintenance crews. But there's a catch installers learn the hard way: solar panels are built to last 25 to 30 years, while a vinyl label kit can fade, curl, and peel in 5 to 7 years of direct sun — leaving the installation non-compliant with no warning. Here's what the code requires and which labels are worth engraving.

Where the requirements live

PV marking is centered in NEC Article 690 Part VI, with power-source identification for multiple sources centralized in Article 705. The 2023 code reorganized several of these — notably moving the building rapid-shutdown placard requirement from 690.56(C) to 690.12(D) and consolidating power-source directory requirements into 705.10 — so the exact citation depends on the edition your jurisdiction has adopted. Confirm the adopted edition before finalizing a label schedule.

The key labels

A compliant PV system typically needs: the rapid shutdown building placard at the service equipment (stating "SOLAR PV SYSTEM EQUIPPED WITH RAPID SHUTDOWN," with a roof diagram and the location of the initiation device); a label at the rapid shutdown switch itself; disconnect labels marking "PV SYSTEM DISCONNECT" with the maximum system voltage, plus a shock-hazard warning where terminals stay energized when open; conduit and raceway marking ("WARNING: PHOTOVOLTAIC POWER SOURCE") at intervals along DC runs; and a power source directory at the service equipment listing the interconnected sources.

A format note worth knowing

Under the 2020 code the rapid shutdown placard had to be reflective, white on red, with minimum letter heights. The 2023 code relaxed the color and reflectivity mandate to require only contrasting text — but many jurisdictions and inspectors still expect the familiar red/white, so confirm with your AHJ rather than assuming.

What's worth engraving

Many of these labels are field-produced and change with the install. The ones worth engraving are the permanent placards that must survive the panels' full service life — the rapid shutdown placard, the disconnect identification, and especially the custom power source directory, which is site-specific and has to stay accurate and legible for decades. Engraved placards don't fade out of compliance the way a vinyl kit does.

Custom Phenolic Labels engraves the permanent solar placards — rapid shutdown, disconnect ID, and custom power source directories — built to outlast the array and ship by the pallet for large installs.

Frequently asked questions

Which NEC edition controls a solar project?

The edition adopted by the state or local jurisdiction controls. Confirm it with the authority having jurisdiction.

Which solar placards are good candidates for engraving?

Permanent rapid-shutdown placards, disconnect identification, and site-specific power-source directories are common candidates.

Plan the complete identification package

Use these connected guides and services to confirm the material, code reference, mounting method, and order details: Engraved Phenolic Labels, Panel Schedule Labeling: What NEC 408.4, NEC Labeling Requirements for Electrical Identification, and Engraved vs. Printed Labels: Which Lasts.