CSLB C-46 Solar ContractorElectrical and Plumbing CodesMedium
A solar contractor is installing a hybrid PV system that includes a battery energy storage system (BESS). The BESS is located in a dedicated utility room. According to NEC Article 706.7(C), what is the minimum required working clearance in front of the battery system where there are exposed live parts or components that may require examination, adjustment, servicing, or maintenance while energized?
- A30 inches (750 mm)
- B36 inches (900 mm)
- C24 inches (600 mm)
- D48 inches (1200 mm)
Show answer & explanationAnswer & explanation
Correct answer: B. 36 inches (900 mm)
NEC Article 706.7(C) mandates that a minimum working clearance of 36 inches (900 mm) be provided in front of the battery system where there are exposed live parts or components requiring maintenance while energized. This clearance is essential for personnel safety.
Why the other options are wrong
- A. 30 inches is less than the required minimum for battery systems per NEC 706.7(C).
- C. 24 inches is insufficient for safe working clearance in front of energized battery systems.
- D. 48 inches is more than the minimum required, but 36 inches is the correct minimum.
BESS Working Clearance
NEC Article 706.7(C) requires a minimum 36-inch (900 mm) working clearance in front of battery energy storage systems with exposed live parts.
- Ensures safe access for maintenance.
- Applies to energized parts.
- Critical for preventing electrical hazards.
Memory trick: Battery Systems: Keep 3 Feet Clear for Safety.