Electric oven/stove/range

[HackElectric]

I am completely out of my element with this because I have never dealt with an electric stove before

I'm doing a load calc on an existing house for a customer who wants a standby generator. They want a 20KW which should be more than sufficient. My only question now is how much I need to have connected to load shedding.

I will have both central AC units shed. The heat and hot water are natural gas. The only other major electric appliance is the stove.

The stove is on a 50A breaker. I did not get any other information on the stove.

So for the purpose of a load calc and determining whether I should connect the stove to a relay to be load shed or not, what would you consider the average current draw of an electric stove?

 

[Smart $]

Well if you're doing an NEC load calc, 8 kW for an electric range rated 8.75 to 12kW.

 

[HackElectric]

Well if you're doing an NEC load calc, 8 kW for an electric range rated 8.75 to 12kW.

That's the thing, I don't know what this stove is rated (my own fault for not looking into it while I was there). I am completely ignorant to electric stoves, I have only seen them in the movies :lol:

Is 8.75 to 12kW the average size?

 

[Smart $]

That's the thing, I don't know what this stove is rated (my own fault for not looking into it while I was there). I am completely ignorant to electric stoves, I have only seen them in the movies :lol:

Is 8.75 to 12kW the average size?

I have not dealt with electric stoves enough to say... but that'd be my guess.

 

[kwired]

I have not dealt with electric stoves enough to say... but that'd be my guess.

And NEC is pretty conservative as far as not overloading anything with it's values, unless you plan to cook Thanksgiving dinner or other big cooking event where you are using all surface elements plus the oven all at the same time - while running on the generator 8.75 is more then you will ever see in most instances, even if the range is rated more then 12kW.

I think most average household ranges with simple surface elements and a single oven and no more then 30 inches wide are 12kW or under.

 

[StarCat]

Electric Ranges

Electric Ranges

I have not dealt with electric stoves enough to say... but that'd be my guess.

Assume a typical diversity for cooking a large meal.
Say Set Oven to 350F

2 Burner tops to low
1 ito Med hi

Take a current reading at startup.

 

[HackElectric]

Thanks for the info guys :thumbsup:

 

[HackElectric]

So here's an odd situation. I used the Load Calc spreadsheet available on Mike Holt's website. Oddly enough the load calc came out to exactly 75A without having to shed the stove. 75A is what the 20Kw generator puts out when fueled by natural gas (18Kw), so it's perfect.

BUT, it's say the neutral demand is 86A. Is this an error with the spreadsheet or is there something I am missing??

ETA: Nevermind. I did it again and this time the neutral demand is showing as 69A, so it must have been an error.

 

[GoldDigger]

If you specified some non-linear line to neutral loads, such as lighting, it may be taking into account the need for a larger neutral to handle the triplen harmonic contribution.
I would need to know more about your inputs to the calculator.

Tapatalk!

 

[iwire]

Hack, you are disappointing me.

Just hook the damn thing up and collect the check.

 

[HackElectric]

Hack, you are disappointing me.

Just hook the damn thing up and collect the check.

It's those darn inspectors, always getting in my way, wanting things installed to code :rant:

 

[kwired]

So here's an odd situation. I used the Load Calc spreadsheet available on Mike Holt's website. Oddly enough the load calc came out to exactly 75A without having to shed the stove. 75A is what the 20Kw generator puts out when fueled by natural gas (18Kw), so it's perfect.

BUT, it's say the neutral demand is 86A. Is this an error with the spreadsheet or is there something I am missing??

ETA: Nevermind. I did it again and this time the neutral demand is showing as 69A, so it must have been an error.

Raises my curiosity as to what the formula is that come up with the neutral demand. Especially if you have a generator as the source you likely do not like to see that much potential imbalanced load on the generator. I also don't think I have ever clamped a meter on a 100 amp service or feeder at a dwelling with anywhere near that kind of load on the neutral conductor. Even 200 amp service/feeders would be somewhat rare to see more then 60 amps on the neutral at a dwelling, and the more straight 240 volt loads you have the more differential you will see between ungrounded and neutral load levels.