Cooking Calculations    Page 2


THE STANDARD CALCULATION
Cooking Appliances
Over 8-3/4kW Through 12kW


This is the standard cooking appliance or perhaps it would be better to say the basis of Table 220.55. Most older style ranges fell into this category, particularly before the self-cleaning oven. The demand factor system was developed based on these ranges. Later accommodations were made for smaller cooktops and wall mounted ovens and for large rated, self-cleaning ovens. 

Determine demand from Table 220.55, Column C. 

Example: What is the demand load for two ranges rated at 10kW?. 

Step 1. Find the "number of appliances" in the first column of Table 220.55. In this case "2". 

Step 2. Run your finger across to Column C. It should read 11. 

This means that the demand load for both ranges is 11kW. 

This is the total demand load. They are not 11,000 each but 11,000 for the combined load. 



If the ranges had been one 9kW and one 10kW, the process would have been the same and the answer would have been the same. This method can only be used with ranges rated 8.76kW through 12kW. 

Example: What is the demand load for 10 ranges rated at 12kW?

Step 1. Find the "number of appliances" in the first column. 

Step 2. Look under column C and cross-index to 10 appliances.

Your answer should be 25kW. 


Example: What is the demand load for 35 ranges rated at 8.85kW?

Step 1. Find the "number of appliances" in the first column. 

Step 2. Look under column C and cross-index. 

This one gets a little trickier. 


You will notice the table does not have a number. Rather is states " 15kW + 1kW for each range"
Mathematically you would determine the demand this way:
15,000 + ( number of ranges X 1,000)= demand

In this case it would be:
15,000 + ( 35 X 1000)= 50,000

Your answer should be 50kW


Example: What is the demand load for 65 ranges rated at 11.49kW?

Step 1. Find the "number of appliances" in the first column. 

Step 2. Look under column C and cross-index. 

This one gets a little trickier. 
You will notice the table does not have a number. Rather is stated " 25kW + 3/4kW for each range"
Mathematically you would determine the demand this way:
25,000 + ( number of ranges X 750)= demand

In this case it would be:
25,000+ ( 65X 750)= 73,750

Your answer should be 73.75kW

Now try these on your own and then click the NEXT button to see the answers and continue the Module. 


What is the cooking equipment demand for the following:

1. 1 range rated 10kW

2. 20 ranges rated 11kW

3. 45 ranges rated 11.2kW

4. 5 ranges rated 10kw and 5 ranges rated 9kw

5. 15 ranges rated 9.98kW and 40 ranges rated 11.99kW