Commerical fryer

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I have commerical fryer restaurant kitchen full load amps of 39 amps. What would be the size of feeder branch circuit breaker be?
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This is not what I am exactly clear on:

39x100% = 39 next rating 40 amps

or

39x1.25 = 48.75 next rating 50 amps.

Is commerical fryer continous load or noncontinous load?

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Almost all heating equipment maintains temperature by cycling power, so non-continuous. I just prefer not loading to 100%, even when it doesn't have to be 125%.
 
Longest time a fryer would be drawing full current would be when first turned on until it reaches set point. Most probably reach set point within 10 maybe 15 minutes max - far from three hours needed to call it a continuous load.
 
It's not a continuous load so a 40 amp branch circuit would be code compliant. I guess that you could use a 50 amp circuit as well.
 
I beg to differ that a commercial deep fryer is not a continuous load... Restaurants around here are incredibly busy, and they often have to wait for their fryers to get back up the temperature after doing batch after patch after batch of fries or chicken or whatever... Those fryer heaters could very easily be on a continuous 3 hours during a lunch or dinner rush
 
JFletcher said:
I beg to differ that a commercial deep fryer is not a continuous load... Restaurants around here are incredibly busy, and they often have to wait for their fryers to get back up the temperature after doing batch after patch after batch of fries or chicken or whatever... Those fryer heaters could very easily be on a continuous 3 hours during a lunch or dinner rush
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Well I dont know how busy my restaurant is going to be. It hasnt been constructed yet. Which is safer electrical point to assume continous or non continous load?

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JFletcher said:
I beg to differ that a commercial deep fryer is not a continuous load... Restaurants around here are incredibly busy, and they often have to wait for their fryers to get back up the temperature after doing batch after patch after batch of fries or chicken or whatever... Those fryer heaters could very easily be on a continuous 3 hours during a lunch or dinner rush
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You need to look at the definition of a continuous load in article 100.
 
infinity said:
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You need to look at the definition of a continuous load in article 100.
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Agreed, it would be an extreme long shot that the load would run continuous on any fryer demand.

Roger
 
infinity said:
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You need to look at the definition of a continuous load in article 100.
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Continuous load: a load where the maximum current is expected to continue for 3 hours or more.

I would expect that the local Chick-fil-A, which has a line of cars wrapped around the building from 11 a.m. to 8 p.m., and a lobby full of people during the same time, would have its deep fryers under non-stop heating during that timeframe. Other restaurants with the deep fryers in sight of the customers, I have seen them frequently go into low oil temperature, and they have to wait for the deep fryers to come back up to minimum cooking temperature.

If you drop basket after basket of frozen french fries, chicken, egg rolls, or whatever into a deep fryer hours on end, would you not expect the elements to be on the entire time?
 
JFletcher said:
Continuous load: a load where the maximum current is expected to continue for 3 hours or more.

I would expect that the local Chick-fil-A, which has a line of cars wrapped around the building from 11 a.m. to 8 p.m., and a lobby full of people during the same time, would have its deep fryers under non-stop heating during that timeframe. Other restaurants with the deep fryers in sight of the customers, I have seen them frequently go into low oil temperature, and they have to wait for the deep fryers to come back up to minimum cooking temperature.

If you drop basket after basket of frozen french fries, chicken, egg rolls, or whatever into a deep fryer hours on end, would you not expect the elements to be on the entire time?
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The definition states that those 3 hours must be continuous and the unit must run at it maximum output for those three hours. Although these units can be on all day long since they units have thermostats they will not run continuously for three hours at their maximum output.
 
infinity said:
The definition states that those 3 hours must be continuous and the unit must run at it maximum output for those three hours. Although these units can be on all day long since they units have thermostats they will not run continuously for three hours at their maximum output.
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If they never reach their temperature set point, the heating elements will never turn off correct? Similar to opening the hot water valve in your bathtub and letting hot water run continuously, your water heaters elements, seeing a steady flow of cold water, would never turn off.

I will freely admit not many restaurants are this busy for this long, however most deep fryers I have seen, are run at their maximum, possibly beyond, loading, and will have their heating elements on so long as you keep putting food in to them to cook.

Edited to add... The last oven I installed, I remember the thermostat clicked on and off even if the temperature was rising... if deep fryers are designed the same way, they may not run continuously for 3 hours. I suppose it really boils down to the power of the fryer and how much product is put into it. I would think a commercial fryer not at set point would run its elements continuously right up to the point of the thermostat setting, tho I admit that train of thought maybe in err.
 
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You have to ask yourself, up front, what the difference in cost is between running #8's and # 6's. If you run # 8's and for whatever wierd reason start to have a breaker tripping problem somewhere down the line it's going to be a lot more expensive (overall) to pull out the 8's and install 6's. Just my opinion but for peace of mind, like Larry, I'd install the 50 amp circuit.
 
electrofelon said:
It's probably going to be a 50 amp circuit anyway, unless it's a 60 degree wiring method like nm or there is derating.
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I was thinking that too if you had something like #8 AWG MC cable for the branch circuit which is good for 50 amps at 75° C, but do they make 75° C rated terminals on a 50 amp receptacle?
 
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