Solar System DC Disconnect and Grounding Check Checklist [FREE PDF]

The DC disconnect and grounding system are among the most safety-critical components of any photovoltaic installation, governed primarily by NFPA 70 NEC Article 690 which mandates accessible disconnecting means capable of interrupting the maximum PV system current at maximum system voltage. Equipment grounding and bonding requirements under NEC 690 Part V and OSHA 29 CFR 1926.404 protect workers and first responders from dangerous ground faults and step-potential hazards that can occur when PV a

  • Industry: Solar Installation
  • Frequency: Per Event
  • Estimated Time: 30-45 minutes
  • Role: Electrical Inspector
  • Total Items: 43
  • Compliance: NFPA 70 NEC Article 690 Parts II and V (PV Disconnects and Grounding), OSHA 29 CFR 1926.404 (Grounding and Bonding Requirements), IEC 62446-1 Grid-Connected PV System Commissioning, UL 1741 Inverters, Converters, and Controllers, NABCEP PV Installation Professional Standards Section 5

DC Disconnect Location and Accessibility

Verify the DC disconnect is installed in a code-compliant location and is readily accessible per NEC requirements.

  • Is the DC disconnect located within sight of and accessible from the inverter per NEC 690.15?
  • Is the DC disconnect mounted at a height between 6 inches and 6.5 feet above the working surface?
  • Is a minimum 36-inch clear working space maintained in front of the DC disconnect enclosure?
  • Is the DC disconnect enclosure rated NEMA 3R or better if installed in an outdoor or wet location?
  • Is the DC disconnect clearly visible and unobstructed from all sides with no stored materials blocking access?

DC Disconnect Ratings and Suitability

Confirm the disconnect device is properly rated for DC service at the system's maximum voltage and current.

  • Is the DC disconnect rated for DC operation at a voltage equal to or greater than the maximum PV system voltage?
  • Is the DC disconnect current rating at least 125% of the maximum PV output circuit current?
  • Is the DC disconnect listed for photovoltaic use or rated for DC switching duty at the required voltage?
  • Does the disconnect switch open all ungrounded conductors of the PV output circuit simultaneously?
  • Is the maximum DC input voltage and current labeled on the disconnect enclosure per NEC 690.53?
  • Is a photograph taken showing the disconnect label, nameplate, and installation location?

Rapid Shutdown System Verification

Verify that the rapid shutdown system meets NEC 690.12 requirements for all applicable installations.

  • Is a rapid shutdown system installed if the PV system is on or inside a building per NEC 690.12?
  • Does the rapid shutdown system reduce array conductor voltage to 30V or less within 30 seconds of initiation?
  • Is the rapid shutdown initiator device (switch or circuit breaker) located at the electrical service equipment?
  • Is the required rapid shutdown label using the NEC-specified sun graphic posted at the electrical meter or service panel?
  • Has the rapid shutdown system been functionally tested and confirmed to operate correctly?

Equipment Grounding Conductors and Continuity

Inspect equipment grounding conductor sizing, installation, and continuity throughout the PV system.

  • Is an equipment grounding conductor (EGC) installed with all PV system circuit conductors throughout the system?
  • Is the EGC sized in accordance with NEC Table 250.122 based on the rating of the overcurrent device protecting the circuit?
  • Is the EGC continuous and unbroken from each PV module frame to the grounding electrode system?
  • Has EGC continuity been tested with a low-resistance ohmmeter (less than 1Ω from module frame to grounding electrode)?
  • Are EGC connections made using listed grounding connectors, lugs, or listed module grounding hardware?

Module Frame and Array Structure Bonding

Verify that all PV module frames, racking components, and mounting structures are properly bonded.

  • Are all PV module frames bonded to the mounting structure using listed module bonding hardware?
  • Is the PV array mounting structure (racking) bonded to the building grounding electrode system?
  • Is bonding hardware listed and identified for the specific module frame material and finish to prevent galvanic corrosion?
  • Is the mounting structure-to-roof attachment hardware listed for the roof type and verified as weathertight?
  • Are all module bonding connections visually inspected for proper seating and secure installation without over-tightening?
  • Is a photograph taken showing representative module bonding hardware installation across the array?

Grounding Electrode System and Ground Rod Installation

Inspect the grounding electrode system, ground rods, and connections to verify code-compliant earth bonding.

  • Is the PV system connected to the existing building grounding electrode system rather than a separate independent ground?
  • If a separate DC grounding electrode is installed, is it bonded to the AC grounding electrode system per NEC 690.47(D)?
  • Are all grounding electrode conductor connections made with listed connectors (irreversible compression type or exothermic welding preferred)?
  • Is the grounding electrode conductor (GEC) sized per NEC Table 250.66 based on the largest service entrance conductor?
  • Is the GEC protected from physical damage where it runs along the surface of the building for the first 8 feet above grade?

Arc-Fault and Ground-Fault Protection Devices

Verify proper installation and functionality of DC arc-fault circuit interrupters (AFCI) and ground-fault protection devices.

  • Is a DC arc-fault circuit interrupter (AFCI) installed for PV systems installed on dwellings per NEC 690.11?
  • Is the AFCI device listed for the system voltage and current values of the installed PV system?
  • Is a ground-fault protection device (GFPD) installed for ungrounded PV systems per NEC 690.5?
  • Has the ground-fault protection device been tested per manufacturer instructions and confirmed operational?
  • Are AFCI and GFPD devices accessible for testing and resetting without disabling or opening the PV array?
  • Is all arc-fault and ground-fault protection documentation included in the system commissioning package?

Final DC Disconnect and Grounding Sign-Off

Complete final inspection summary, deficiency documentation, and inspector certification.

  • Have all identified deficiencies from this inspection been documented and assigned for corrective action?
  • Is the system approved for energization based on the results of this DC disconnect and grounding inspection?
  • Have any items requiring re-inspection after corrective action been noted for follow-up?
  • Please provide any additional notes, observations, or special conditions observed during this inspection?
  • Is a complete photographic record attached to this inspection report documenting all major system components?

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Why Use This Solar System DC Disconnect and Grounding Check Checklist [FREE PDF]?

This solar system dc disconnect and grounding check checklist [free pdf] helps solar installation teams maintain compliance and operational excellence. Designed for electrical inspector professionals, this checklist covers 43 critical inspection points across 8 sections. Recommended frequency: per event.

Ensures compliance with NFPA 70 NEC Article 690 Parts II and V (PV Disconnects and Grounding), OSHA 29 CFR 1926.404 (Grounding and Bonding Requirements), IEC 62446-1 Grid-Connected PV System Commissioning, UL 1741 Inverters, Converters, and Controllers, NABCEP PV Installation Professional Standards Section 5. Regulatory-aligned for audit readiness and inspection documentation.

Frequently Asked Questions

What does the Solar System DC Disconnect and Grounding Check Checklist [FREE PDF] cover?

This checklist covers 43 inspection items across 8 sections: DC Disconnect Location and Accessibility, DC Disconnect Ratings and Suitability, Rapid Shutdown System Verification, Equipment Grounding Conductors and Continuity, Module Frame and Array Structure Bonding, Grounding Electrode System and Ground Rod Installation, Arc-Fault and Ground-Fault Protection Devices, Final DC Disconnect and Grounding Sign-Off. It is designed for solar installation operations and compliance.

How often should this checklist be completed?

This checklist should be completed per event. Each completion takes approximately 30-45 minutes.

Who should use this Solar System DC Disconnect and Grounding Check Checklist [FREE PDF]?

This checklist is designed for Electrical Inspector professionals in the solar installation industry. It can be used for self-assessments, team audits, and regulatory compliance documentation.

Can I download this checklist as a PDF?

Yes, this checklist is available as a free PDF download. You can also use it digitally in the POPProbe mobile app for real-time data capture, photo documentation, and automatic reporting.

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