Quick Answer
Ignoring NEC 690.12 can lead to electrical shock, fires, or equipment damage due to the failure to rapidly disconnect DC power in the event of an arc fault. This oversight can put people and property at risk. It can also lead to costly rework or even system failure.
NEC 690.12 Requirements
NEC 690.12 requires rapid shutdown of DC power systems within 30 seconds in the event of an arc fault. This is crucial to prevent electrical shock and fires. The rapid shutdown system (RSS) must disconnect DC power at all points of utilization, including PV modules, inverters, and DC loads.
Consequences of Non-Compliance
Non-compliance with NEC 690.12 can result in costly fines, penalties, or even system shutdowns. Homeowners or businesses may be held liable for damages or injuries caused by non-compliant systems. In extreme cases, non-compliance can lead to loss of property or even life.
Implementation and Testing
Implementing a compliant rapid shutdown system requires careful planning, installation, and testing. Systems must be inspected and tested to ensure they meet the 30-second arc fault detection and disconnection time. This may involve specialized tools and training, and it’s essential to engage a qualified electrician or solar professional to ensure compliance.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.