What is a critical factor to consider in load calculations for circuits?

In the context of load calculations for circuits, it's essential to understand that the total expected demand of connected devices is the critical factor to consider. This approach ensures that the electrical system can handle the required load without overheating or becoming overloaded, which could potentially lead to circuit failure or fire hazards.

By calculating the total expected demand, one can determine the appropriate size of the circuit conductors and protection devices, such as breakers or fuses. This involves assessing the cumulative power requirements of all devices that may be used simultaneously, taking into account both their rated capacities and any factors that might influence their operational use, such as diversity and demand factors defined in the code.

The other considerations mentioned may influence load calculations but are not as central to ensuring that the circuit is designed safely and effectively to meet the demands placed upon it. For instance, while the number of outlets is relevant, it does not directly address how much load those outlets will potentially carry. Similarly, understanding historical usage or the age of wiring can provide context but does not replace the necessity of calculating the actual expected demand of connected devices in load calculations.