Table 220.84 of the National Electrical Code (NEC) provides a standardized method for calculating the demand load for electric vehicles (EVs) in non-residential settings. In this lesson, we will discuss how to use Table 220.84 to determine the demand load for EVs.

Determine the Number of EVs The first step in using Table 220.84 is to determine the number of EVs that will be connected to the charging equipment. This can be based on the number of parking spaces, the number of EVs expected to be charged at one time, or other factors.

Determine the Maximum Load Current Once the number of EVs has been determined, the next step is to determine the maximum load current for the charging equipment. This can be found on the nameplate of the equipment or in the manufacturer’s specifications.

Determine the Charging Time The third step is to determine the charging time for the EVs. This may be based on the expected usage of the EVs, the time of day when the charging will occur, or other factors.

Locate the Appropriate Column and Row Using the number of EVs, maximum load current, and charging time, locate the appropriate column and row in Table 220.84. The columns correspond to the maximum load current of the charging equipment, while the rows correspond to the charging time.

Determine the Demand Load Once the appropriate column and row have been located, the demand load for the EVs can be determined. This information is listed in the table and corresponds to the number of EVs and the charging time.

It is important to note that Table 220.84 provides the maximum demand load for the EVs and that the actual load may be less. For example, if fewer EVs are charged at one time or if the charging time is shorter than the maximum listed in the table, the actual load may be less than the maximum demand load.

In addition, Table 220.84 is only one method for calculating the demand load for EVs and may not be appropriate for all types of installations or situations. It is important to consult the specific requirements of Article 220 of the NEC and to use professional judgment when calculating the demand load.

Overall, Table 220.84 provides a standardized method for calculating the demand load for EVs in non-residential settings. By following the steps outlined above, it is possible to use Table 220.84 to determine the demand load for a given number of EVs and charging equipment.

It is important to note that Table 220.84 is updated every three years with each new edition of the NEC. Therefore, it is important to use the most current version of the table to ensure accurate calculations.

In summary, using Table 220.84 of the NEC involves determining the number of EVs, determining the maximum load current for the charging equipment, determining the charging time, locating the appropriate column and row in the table, and determining the demand load. It is important to use professional judgment and consult the specific requirements of Article 220 of the NEC when calculating the demand load.