How many overcurrent devices are allowed to be installed in a panelboard?

The correct answer states that the number of overcurrent devices allowed to be installed in a panelboard is determined by how many the panelboard is listed for. Each panelboard comes with a specific rating and listing from the manufacturer, which indicates how many circuits and overcurrent protective devices it can handle safely. This is important for ensuring that the panelboard operates within its design specifications, preventing overloads that can lead to equipment failure or fire hazards.

Each listing accounts for both the physical space within the panelboard for the devices and the electrical capacity to handle the load. It’s crucial to adhere to these specifications because exceeding the listed number of devices can compromise the safety and functionality of the electrical system. Therefore, referencing the manufacturer’s documentation for the panelboard is essential when determining the maximum number of overcurrent devices that can be installed safely.