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NOTE: This is an unformatted excerpt from our online fire protection training library.

Load Calculations

Branch Circuit Load Calculations

Table 220.3

Table 220.3 (click to open)

As noted at the beginning of this module, some specific equipment will be based on Table 220.3, which provides references to specific rules for many different kinds of loads. In some cases, these loads will be determined by some kind of calculation based on the nameplate. There may be some multiplier or demand factor that's applied to that specific type of load. It may depend on how many of those loads there are. Welders are an example. 

In other cases, the nameplate may directly provide the conductor rating, and that rating will be used as the load. Air conditioning equipment covered by Article 440 is an example of this. 

Sometimes, the requirements referenced in Table 220.3 may only specify that the load will be treated as a continuous load. Although that does not affect the load calculation at this point, it does affect the sizing of conductors and overcurrent devices. Electric water heaters as covered by Section 422.11(E) fall into this category.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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