What is the maximum weight ceiling fan boxes must support to require markings for their weight limit?

Ceiling fan boxes must support a weight limit of 35 pounds to require markings indicating their weight capacity. This requirement ensures that the box can safely accommodate the varying weights of ceiling fans, which can often be quite heavy, especially when considering additional features such as lights or decorative elements. By marking the weight limit, it provides clear guidance for electricians and homeowners, helping to prevent installation errors that could lead to structural failures or safety hazards.

Understanding this threshold is particularly important in residential wiring, as the integrity of ceiling fan installations hinges on proper support systems. Markings serve as a reminder to adhere to these safety standards, ensuring that the installed fan remains secure and operational for its lifetime.