CSLB C-46 Solar ContractorPlanning and EstimatingEasy
A C-46 contractor is conducting a final inspection of a newly installed residential PV system before calling for the rough-in electrical inspection. Which of the following is the MOST critical item to verify regarding grounding and bonding for system safety?
- AConduit fill ratios comply with NEC 310.15(B)(3)(a).
- BThe inverter chassis is painted to match the exterior wall color.
- CThe PV array is oriented precisely to true south.
- DAll module frames are connected to the equipment grounding conductor.
Show answer & explanationAnswer & explanation
Correct answer: D. All module frames are connected to the equipment grounding conductor.
Proper grounding and bonding of all metallic, non-current-carrying components (like module frames and racking) is paramount for safety. It ensures that in the event of a fault, hazardous voltages are safely dissipated to the earth, preventing shock hazards and equipment damage. This is a fundamental requirement of NEC Article 690.
Why the other options are wrong
- A. Conduit fill ratios are important for preventing overheating and ensuring proper wire sizing, but grounding of module frames is a more fundamental safety aspect for the entire array.
- B. Inverter aesthetics (painting) are not a safety or critical inspection item.
- C. Array orientation affects performance, not direct electrical safety during a rough-in inspection.
PV System Grounding & Bonding
Connecting all non-current-carrying metallic components of a PV system to the earth to provide a safe path for fault currents and prevent electrocution.
- Mandated by NEC Article 690.
- Protects against shock hazards and lightning strikes.
- Ensures proper overcurrent protection device operation.
Memory trick: Ground your frames, or feel the pain! Safety first, come sun or rain!