Overall Diversity in huge commercial kitchen

Question

Good afternoon 
 If anyone has any knowledge or gut feeling please go on and share it with me 
 We a well known restaurant/pub that is expected to be busy 
 There is a good 300A of installed power in the kitchen only 
 Unfortunately the power supply for the whole installation (including mechanical loads, front of house, bar, back of house etc) is a frugal 315A 
 So, taking into consideration that kitchen is the heart and sould of the place what do you think should be a realistic diversity to be applied on this 300A of connected load? 
 My initial thoughts were 50% bringing it down to 150A of constant current 
 However an older and much more experienced engineer proposed something along the 75% mark. 
 Does anyone have any similar real life experience with this? 
 Any insights are highly appreciated 
 Cheers

broadgage · Accepted Answer

I do not think that there is a simple answer to this, it depends on the type of appliances and the expected pattern of use. 
 A total supply of 315 amps strongly suggests three phase as single phase supplies that big are rare. Is the connected load 300 amps per phase, or 300 amps single phase. An induction cook top often has a similar loading to radiant rings, but the AVERAGE of several induction cookers will tend to be less as they heat so quickly and therefore run for a shorter time. 
 A fast food takeaway could if busy have numerous heavy loading appliances in almost continuous use, in which case allowing 75% of the connected load might be prudent. 
 A table service restaurant with each meal cooked to order might have a more moderate actual loading. Consider as an example, table 6 order four main meals of say steaks and vegetables. The peak loading of a grill and say six boiling rings can be considerable, but is unlikely to be continuous. 
 The next table might not order for some minutes. And even if a coach party arrive, are there enough waiters to take two dozen meal orders at once, and enough cooks to prepare many meals at the same time. Probably not, in which case allowing say 50% of the connected load should be ample.

Overall Diversity in huge commercial kitchen

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