Which of the following is NOT allowed for PV DC disconnects?

A PV DC disconnect must adhere to specific guidelines regarding its placement and accessibility to ensure safety and operational effectiveness. The correct answer identifies that placing a DC disconnect in bathrooms is not allowed. This restriction is primarily based on safety concerns, as bathrooms can be high-humidity locations, which may lead to corrosion and possibly cause electrical failures or hazards.

Placement of the disconnect where moisture or humidity can easily accumulate is considered unsafe, as water can lead to short circuits or electrical shocks. Furthermore, the NEC (National Electrical Code) generally prohibits electrical equipment installation in areas prone to moisture unless it is specifically designed for those conditions.

In contrast, the other options involve practices that are compliant with standards. It is appropriate for a DC disconnect to be installed near the inverter for ease of access and maintenance. Additionally, using disconnects with combiner boxes is a standard practice, as this configuration is essential for safely managing multiple strings of solar panels. Ensuring that disconnects are accessible for maintenance further enhances safety and operational readiness, aligning with electrical code requirements that emphasize safe access in the event of emergencies or routine maintenance.