Solar Safety Compliance Checklist: NEC, IEC and OSHA Steps for Installers

Use this checklist to keep the safety records for a solar project, from design to maintenance. Give each item an owner, the rule behind it, a dated result and any open issue. A ticked box with no record behind it is not proof of safety.

Answer: what a useful solar safety checklist includes

A solar safety checklist has ten stages. Check which code edition your authority enforces. Review the design and assess the site. Then mount the array, wire the DC side and set up the inverter. Connect to the grid, test to IEC 62446-1, hand over the records, then maintain. Give each item an owner, a source and a dated result.

This list helps your team coordinate reviews and keep evidence. It is not a test procedure or a settings sheet. Live electrical work needs a qualified person and a written procedure for that task.

Know the rules before you start

Which NEC edition applies to solar in 2026?

The edition your state or city has adopted. The National Electrical Code (NEC) is the US rulebook for electrical work. A new edition does not apply until a government adopts it. NFPA, the group that publishes the NEC, issued the 2026 edition on 20 August 2025. It became available for governments to adopt on 9 September 2025 (NFPA, NEC enforcement).

NFPA’s page shows the position on 3 August 2026:

• The 2026 NEC is in effect in six states: Colorado, Maine, Massachusetts, Minnesota, North Dakota and Wyoming.
• The 2023 NEC is in effect in 20 states, and the 2020 NEC in 15.
• The 2017 NEC is in effect in three states, and the 2008 NEC in two.
• Arizona, Mississippi and Missouri leave adoption to local governments.

Some examples from the same page. Texas uses the 2023 NEC (effective 1 September 2023). California uses the 2023 NEC with California changes (1 January 2026). Florida uses the 2020 NEC (31 December 2023). Chicago (2017, with changes) and New York City (2020, with changes) have their own codes. Look up your state and city on that page, then read the local changes.

IEC 62446-1 and UL 62446-1

IEC 62446-1 is an international standard for handover papers, commissioning tests and inspection of grid-connected solar systems. IEC 62446-1:2016+A1:2018 is edition 1.1, published 10 August 2018. IEC lists it as valid.

The same IEC page shows edition 2.0 in development, at the “approved for FDIS” stage, with a forecast publication date of 11 July 2026. On 28 October 2026 the page still showed that stage and date. Check the IEC catalogue for the current edition before you cite it in a handover pack.

In the US, UL publishes UL 62446-1 (Edition 1, last revised 20 October 2022). Its scope covers grid-connected systems without energy storage. UL says it can also be used for periodic retesting.

Which standard covers which stage

OSHA is the US workplace safety agency. NFPA 70E says it helps companies follow OSHA 1910 Subpart S and 1926 Subpart K. For more on US rules, read our guides to OSHA rules for solar installers and NEC rules for US solar.

1. Design review: write down the key assumptions

• Name the local authority, the utility and the electrical, building and fire rules that apply.
• Name the electrical and structural reviewers and record who can approve the work.
• Check the real module, inverter, mounting, protection and storage models against the design revision.
• Check string voltage in cold weather, the inverter voltage range and the current limits, using datasheets and site temperatures.
• Check cable size, installation method, correction factors, protection and voltage drop with the method your code edition uses.
• Settle the connection plan, earthing and bonding (the safety connections to ground), protection settings and operating mode.

Record the method, the code edition, the units, the assumptions and the reviewer’s decision for each calculation. NEC Article 690 covers PV wiring methods, so read it in the edition your authority enforces. The design guide covers the engineering steps.

2. Before installation: check the site and the task

• Check the roof condition, fragile surfaces, openings, edges, access and strength with competent people.
• Find the power sources, existing services and overhead lines, and decide who isolates what.
• Plan fall protection, lifting, access and rescue.
• Set weather and stop-work limits from the site risk assessment and the equipment limits.
• Brief the crew on the plan before work starts.

In the US, OSHA has a rule for construction workers who could fall 6 feet (1.8 m) or more. They need guardrails, safety nets or a personal fall arrest system. The rule is 29 CFR 1926.501(b)(1). The same section says the employer must check that the working surface can safely support workers (1926.501(a)(2)).

OSHA also gives these rules:

• Guard skylights, or make workers near them use personal fall protection.
• Never let workers climb a ladder while carrying a panel. Use ladder hoists, swing hoists or truck-mounted cranes or conveyors where you can.
• Stay at least 10 feet from overhead power lines (OSHA electrical page).

Maintenance work is treated differently. A worker exposed to a fall of 4 feet or more needs a standard railing. If a railing is not possible, use a fall arrest device or a safety net.

In Great Britain, the HSE guide on fragile surfaces covers falls through fragile roofing. The UK MIS 3002 installation standard (clause 3.1.3) requires a risk assessment before any work on site. It notes that PV work combines shock, falls and heavy lifting. Roofers and electricians each know only some of these risks.

3. Mounting: match the structure and the manufacturer’s instructions

• Check the mounting plan matches the reviewed roof, the loads and the approved equipment.
• Check clamps, fasteners and fixing points against the module and rail instructions.
• Record each fastening check with the manufacturer’s value and the tool used.
• Check roof penetrations, flashings and membrane compatibility with the roofing contractor.
• Photograph hidden details and keep change records.

MIS 3002 shows what a written standard asks for on UK roofs, for systems up to 50 kWp:

• A competent person must check that the roof structure can carry the array (3.9.3). Where the roof is unusual or in doubt, a structural engineer must be asked (3.9.5).
• Modules should stay at least 400 mm from the edge of a domestic roof (3.9.6). The exception is extra measures for wind uplift, ridge tiles, snow and run-off.
• Where needed, tiles or slates must be notched or flashed (sealed with metal or similar) so they do not leave gaps bigger than before the install (3.9.7).
• On metal roofs, check the sheet thickness and how the sheet is fixed to the structure (3.9.8, 3.9.9).
• For ballasted flat-roof systems, use a friction coefficient of 0.3 for sliding unless the material pair has been tested (3.9.12).
• If a mounting system is certified with a named module, use only that module (3.5.4).
• Install all equipment to its manufacturer’s instructions (3.4.1).

Other countries set their own limits. Take wind, snow and roof-edge rules from the code and the mounting maker for your site.

4. DC circuits: reviewed equipment and safe work

• Match cable routes, supports, protection, labels and weather rating to the reviewed drawings.
• Check which connector pairs fit together, and the tools and steps for each connector make.
• Confirm the equipment DC ratings and the protection and disconnect plan.
• Record workmanship findings and how you closed each one before release.
• Do any measurement or circuit work under the qualified person’s test procedure.

Under NEC 2020 and later, exposed cables must be supported and secured at intervals of 600 mm (24 in.) or less. The fittings must be listed for outdoor use. There are exceptions for strong multiconductor cables and engineered supports. This comes from a US Department of Energy summary of 690.31(C).

The same document reports that standard plastic cable ties have failed in the field. It also cites the SolarGrade PV Health Report from Heliovolta, which used 60,000 field inspection data points. Of the systems inspected, 61% had major or critical conditions. Of those serious conditions, 91% came from the DC distribution system. Of the DC failures, 26% came from poor cable management.

MIS 3002 asks installers to keep DC plug-and-socket connectors out of water (3.6.3). It also asks them to assemble connectors with the correct tools and steps (3.6.4). Its note says wrong crimping tools are a major cause of failed connections and even fires. Our MC4 connector guide shows the right practice.

OSHA’s lockout/tagout page says employers should make sure workers cover the solar panels, as well as protect against the circuits. Sunlit modules make DC voltage even when the AC supply is off. Work on live conductors only under a written procedure from the qualified person.

5. Inverter and storage: check the exact setup

• Check location, clearances, airflow, enclosure rating and access against the inverter instructions.
• Record the installed firmware and settings where they affect the approved protection and operating mode.
• Confirm the rapid shutdown method, labels and test with the adopted code.
• For storage, add the equipment, fire, siting and operating rules to the project register.
• Log open deviations and the approval you need before operation.

Rapid shutdown is a system that cuts DC voltage fast in an emergency. It is in NEC Section 690.12, and 690.12(C) covers the devices that start it (NFPA TIA 1835, proposed 2026 text). You must meet the edition your authority enforces. Our NEC 2026 rapid shutdown guide covers what changed in 2026. NFPA lists NEC Article 706 and NFPA 855 among the standards for energy storage systems.

MIS 3002 adds two practical points:

• If the inverter has an arc-fault detection function, it must be switched on (3.6.7). An arc fault is a dangerous electrical spark in a cable or joint. Our arc-fault detection guide explains it.
• Keep the ingress protection (IP) rating for the location, which shows how well a box keeps out dust and water. The note calls for cable entry at the bottom of enclosures, a drip loop and one cable per gland (3.6.5).

6. AC connection: keep the network operator’s decision on file

• Record the approved connection point, operating mode and meter setup.
• Keep the network application, the agreement and any studies or witness tests.
• Have authorised staff apply the accepted settings from the official procedure.
• Record the configuration and any change after review.
• Track installation, inspection, connection permission and switch-on as separate statuses.

In the UK, MIS 3002 (3.1.5) points installers to three network rules from Engineering Recommendations:

• G98 for installations up to and including 16 A per phase.
• G99 for installations above 16 A per phase.
• G100 where export is limited.

The 16 A limit counts the total AC output of all generators on the connection. MIS 3002 gives this example. A 3 kW PV system and a 3 kW battery on the same single-phase supply together exceed 16 A, so G99 applies. The sum is 6,000 W divided by 230 V, which is about 26 A.

In the US, NEC Article 705 covers power sources connected to the grid. Take protection settings from your utility or network operator for the project. A single-line diagram (a simple drawing of how the system is wired) does not allow grid operation. Our interconnection application guide covers the US paperwork.

7. Commissioning: IEC 62446-1 tests, then records

• Agree the inspection and test plan with the responsible skilled person.
• Confirm safe test conditions, and that each instrument is suitable and calibrated.
• Record the procedure, the standard edition, the pass limit and the conditions.
• Link every result to a circuit, a piece of equipment and a drawing revision.
• Record findings, fixes, retests and who released the system.

IEC 62446-1 splits checking into inspection (clause 5.2) and testing (clause 5.3). The contents page of the standard lists these procedures. You can see it in the publisher’s preview.

A string is a line of modules wired in series. Open-circuit voltage is the voltage with nothing connected. An I-V curve shows how current and voltage change together.

Amendment 1 (2018) adds a shortcut. A harness sub-array (HSA) can stand in for single strings in the open-circuit voltage, current and I-V curve tests. An HSA has a combined short-circuit current at standard test conditions of no more than 30 A. It joins no more than 10 strings.

The amendment also sets a light level for I-V curve and array performance measurements. Irradiance (sunlight strength) must be stable and at least 400 W/m2 in the plane of the array. It notes that I-V curve testing and electroluminescence inspection are typically not possible on systems with module-level electronics.

Clause 5.1 says initial and periodic checks must be made by a skilled person. The minimum insulation-resistance values for arrays up to 10 kWp are in Table 2 of the standard. IEC sells the standard, so take the pass limit from your licensed copy. Do not test live circuits except under the written procedure.

8. Handover: make the records easy to use

IEC 62446-1 clause 4 lists the documents to give the customer. This is what its contents page names:

Annexes A to C of the standard give a model verification certificate, inspection report and array test report.

• Match quantities, setup and locations across the drawings and the installed system.
• Keep permits, certificates and utility decisions under their exact titles.
• Tell the owner about limits and open operating conditions.
• Hand over monitoring access in the agreed way.
• Confirm where the emergency instructions and maintenance records are kept.

Read a test result or photo only within its method and conditions. Our project closeout package guide covers the records in more detail.

9. Jurisdiction register: one row per project

Use the Europe compliance overview to find regional rules. The solar installation hub links to supporting guides. NEC, IEC, OSHA and national grid codes are separate rule sets. Each one applies where it is adopted.

10. Maintenance: assign the plan and the escalation steps

• Agree inspection and maintenance duties from current rules, equipment instructions and site risk.
• Assign an owner, dates, access arrangements and a place to keep records.
• Set a review after damage, faults, equipment changes or severe weather.
• Keep findings, fixes and proof that the system is back to normal.
• Review monitoring data together with weather, sensor quality and outages.

IEC 62446-1 (clause 5.1) says the gap between periodic checks must be no longer than the gap the connected AC system needs. Some countries set it by law. IEC 62446-2 covers maintenance. IEC TS 62446-3 covers outdoor infrared thermography, which uses a heat camera. A hot spot in an image is a reason to investigate, not a diagnosis.

For US maintenance work, OSHA generally applies its general industry standards, with a standard railing at 4 feet or more. Its lockout/tagout page says solar employers may need the procedures in 29 CFR 1910.269(d) or 1910.147. Check the maker’s advice before any firmware update, because an update can change the approved setup.

Design software and your safety records

SurgePV’s design workflow covers roof modeling, layout, shading, energy yield and electrical workflow support. It produces a bill of materials and proposals from the design. These outputs support design and documents. They do not replace approval by the responsible engineer, the authority or the utility. Use a demo to see which records the workflow produces for your project. See the PV design software page for the feature scope.

Keep reading: the installation guide, the installation steps hub, design principles for installers and the European solar fire-safety guide.

Frequently Asked Questions

What is IEC 62446 and why does it matter for solar installers?

IEC 62446 is a family of standards for testing, documenting and maintaining PV systems. Part 1 covers the handover documents, commissioning tests and inspection of grid-connected systems. It is written for designers and installers. Part 2 covers maintenance. Part 3 is a technical specification for outdoor infrared (heat camera) checks. In the US, the UL edition is UL 62446-1.

What safety tests are required before commissioning a solar system?

IEC 62446-1 lists seven Category 1 procedures for all systems. They are: continuity of protective earthing and bonding conductors, polarity, string combiner box test, string open-circuit voltage, string current, functional tests and array insulation resistance. Category 2 adds string I-V curve measurement and infrared inspection. The standard applies when your regulator, utility or contract adopts it. A skilled person must carry out the tests.

How does NEC Article 690 differ from IEC 62446?

NEC Article 690 is an installation code for PV systems. US states and cities adopt it, and the local authority enforces it. IEC 62446-1 is a standard for handover documents, commissioning tests and inspection. It applies where a regulator, utility or contract adopts it. A US project follows the NEC edition its authority enforces. It may also be asked for IEC or UL 62446-1 records.

Which NEC edition applies to solar in 2026?

The edition your state or city has adopted, not the newest one published. NFPA issued the 2026 NEC on 20 August 2025. NFPA’s enforcement page shows the position on 3 August 2026. The 2026 NEC was in effect in six states, the 2023 NEC in 20 and the 2020 NEC in 15. Check NFPA’s state list and your local changes before you design.

What PPE do solar installers need?

PPE means personal protective equipment. What you need depends on the hazards the employer finds in its assessment. OSHA’s solar guidance names safety glasses, hard hats, gloves and respirators as examples. It also names electrical protective equipment for workers exposed to electrical hazards. For falls of 6 feet or more in construction, OSHA requires guardrails, safety nets or a personal fall arrest system. Head, eye and face rules are in 29 CFR 1926.100 and 1926.102.

What is the difference between IEC 62446-1 and IEC 62446-3?

Part 1 covers handover documents, commissioning tests and inspection of grid-connected PV systems. Part 3 is a technical specification for outdoor infrared (heat camera) checks of working modules and plants. A heat image can support a maintenance check. It does not replace the Part 1 commissioning tests.

What rapid shutdown requirements apply under NEC 690 in 2026?

Rapid shutdown is in NEC Section 690.12, and 690.12(C) covers the devices that start it. You must meet the NEC edition your authority enforces, so look up the state edition first. Our NEC 2026 rapid shutdown guide covers what changed in the 2026 edition.

How often should a solar system be inspected for maintenance compliance?

IEC 62446-1 says the gap between periodic checks must be no longer than the gap the connected AC electrical system needs. Some countries set the gap by law. Write the interval, the owner and the due dates into the maintenance plan. Add a review after damage, faults or equipment changes.