The 120% rule for solar is an important standard that all solar PV system installers must keep in mind. Essentially, this rule is part of the National Electric Code (NEC) and it allows for solar PV systems to be placed in electrical boxes that are up to 120% of the installed safety label for electrical equipment. This means that the maximum current-carrying capacity of the equipment can be up to 120% of the rated amperage of the circuit breaker that is protecting it.
To better understand the 120% rule for solar, here are some key points to keep in mind:
The NEC 120% rule applies to all solar PV systems, whether they are residential or commercial installations.
The 120% rule is designed to ensure that the electrical equipment is not overloaded, which could cause it to overheat and potentially lead to a fire.
Solar PV systems generate electricity that is fed into the electrical grid, so it is important that the equipment is properly rated and installed to avoid any safety hazards.
Installers must carefully calculate the maximum current-carrying capacity of the electrical boxes and ensure that the equipment is rated appropriately to meet the 120% rule.
Adhering to the 120% rule for solar is essential for ensuring the safety and reliability of solar PV systems.
Overall, the 120% rule for solar is an important standard that must be followed to ensure the safety and reliability of solar PV systems. By carefully assessing the maximum current-carrying capacity of electrical equipment and adhering to the NEC guidelines, installers can help to prevent any potential safety hazards that may arise from overloaded equipment.