What is the significance of the rating of branch-circuits with respect to total load?

The significance of the rating of branch circuits in relation to total load is that it sets a maximum limit. Each branch circuit is designed to carry a specific amount of current, which is determined by its rating. This rating is critical as exceeding it can lead to overheating, circuit failure, and potential fire hazards. Therefore, knowing the maximum limit helps ensure that the electrical system operates safely and effectively, preventing overloading issues.

When considering a branch circuit, the total load must not exceed its rated capacity. This is essential for compliance with the National Electrical Code (NEC) and safety standards, as it helps protect both the wiring and connected devices from damage caused by excessive current. Properly rating and loading branch circuits is vital for maintaining system integrity and ensuring reliable performance.