Now compute the demand load by multiplying the total load by the demand factor percent 84 x 32 26 88kw.
Kitchen equipment demand factor. Demand factor is always less than one. The lowest demand load for 12 7kw ranges is 26 88kw or 26 880w see figure 2. Unless meeting the requirement in the last note under table 220 19 load calculations for kitchen equipment in other than dwelling units must comply with 220 20 and table 220 20. A the total number of receptacles at 180va per receptacle outlet b the va rating of all of the small appliance branch circuits combined c the largest two kitchen equipment loads.
As stated in the fifth note the demand loads. Finally find the demand load in column c compare the two and select the lowest. The demand factor for commercial kitchen equipment loads defined in nec 220 56 is a complicated example. The lower the demand factor the less system capacity required to serve the connected load.
These demand factors shall be applied to all equipment that has either thermostatic control or intermittent use as kitchen equipment. When doing commercial load calculations you have to know when the code allows the application of a demand factor and when. Elevator feeder demand factors 620 620 14 fire pumps voltage drop mandatory calculation 695 695 7 fixed electric heating equipment for pipelines and vessels branch circuit sizing 427 427 4 fixed electric space heating equipment branch circuit sizing 424 424 3 fixed outdoor electric deicing and snow melting equipment branch circuit sizing. If we use the nec 220 56 to calculate the demand load on the feeder to these panels and then use this calculated demand load to size a new transformer we would get 93kw demand factor of 65 of kitchen equipment load miscellaneous receptacles etc.
The demand in column c for six appliances is 27kw. Up to now the demand load calculations in 220 19 have applied to household electric cooking equipment in dwelling units. The nec also provides specific requirements for calculating the loads for restaurant equipment show window lighting sign lighting multi outlet assemblies and electric welders. When applying the demand factors of table 220 56 the feeder or service demand load shall not be less than the sum of.
In general the demand factor is based upon table 220 56 which specifies a demand factor based upon the number of units of equipment. Dears i have a question about kitchen equipment and restaurant low voltage distribution i have 5 restaurant with 1 main kitchen for all i want to make sure that i understood it correctly that i can take demand factor 0 65 for kitchen equipment in any non dwelling unit so can i take this demand factor for kitchen equipment in restaurant or not the equipments more than 10 units. If a residence having 6000w equipment connected has a maximum demand of 300w than demand factor 6000w 3300w 55.