Dual Fuel Range

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Dennis Alwon

Dennis Alwon

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Retired Electrical Contractor
Scenario-- a dual fuel range-- cooktop is gas, oven is electric.

Broiler element is 3240 watts
Baking Element is 2000 watts
Convection is 1600 watts

Nameplate says 24 amps and if I add the wattage up I get 6840 watts. If I use col.B I take 80% and get 5472. If I divide by 230 I get 24 amps. If I divide by 240 I get 23 amps.

Now-- the instruction state "When a 4 wire or 3 wire single phase 120/240 volt, 60 HZ, ac only electrical supply is available, a 50 amp maximum circuit protection is required. When a 4 wire or 3 wire single phase 120/208 volt 60 HZ, ac only electrical supply is available, a 40 amp maximum circuit protection is required.

Firstly, is this a range as stated in note 4? It is not all electric so.....????
or do I calculate this as a wall oven using note 4 which means the nameplate?


Secondly--So what does this mean? Do I need a 50 amp circuit? Can I run #10 and fuse at 30 amps? It says 50 amp max. I assume that means I can use 30 amp or 40 amps as long as my wire is sized appropriately.

Any help or thoughts
 
frizbeedog said:
Funny that the instuctions say Maximum.

When they should say Minimum.
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I finally ran a #8 and used a 40 amp breaker. It's just so confusing. I wish they would put min cir on the dang unit. I can't imagine why it would need more than 30 amps. I cannot understand why a 50 amp or even a 40 amp breaker is even legal .
 
frizbeedog said:
Funny that the instuctions say Maximum.

When they should say Minimum.
Click to expand...

Why do you say that? Doesn't most equipment come with instructions stating the maximum OCPD?

EDIT: I probably would of put it on a 30 amp breaker also.
 
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peter d said:
As soon as I saw the title, the first thing that came to my mind was "30 amp circuit."

How did I do?
Click to expand...

That is exactly what I thought, but... This is the 2nd one I have done in 2 weeks.

I am not sure if you passed...:grin:
 
Keep in mind that the bake and broil elements don't operate at the same time.

I've never had to run bigger than a 30 amp to a duel fuel oven, unless it was a double oven.
 
mdshunk said:
I've never had to run bigger than a 30 amp to a duel fuel oven, unless it was a double oven.
Click to expand...

I have had a single oven call for a 40 amp but I don't get the info on this. Is it even okay to put it on a 40 amp cir.???
 
Dennis Alwon said:
I have had a single oven call for a 40 amp but I don't get the info on this. Is it even okay to put it on a 40 amp cir.???
Click to expand...

Seems like a "not to exceed" type of labeling.

Based on the supply voltage listed.
 
Dennis Alwon said:
I have had a single oven call for a 40 amp but I don't get the info on this. Is it even okay to put it on a 40 amp cir.???
Click to expand...
I think your ok, 210.20 Range Receptacle Rating, pushs it over to the dreaded table 220.55.
 
frizbeedog said:
Seems like a "not to exceed" type of labeling.

Based on the supply voltage listed.
Click to expand...
Why would it be allowed to have a 50 amp cir. on this unit? I didn't do it but it seems like I could. I just don't know where the NEC stands on this. Load is 24 amps. Why should I be allowed to go to 40 or 50 amps.

cadpoint said:
I think your ok, 210.20 Range Receptacle Rating, pushs it over to the dreaded table 220.55.
Click to expand...
Yes. so does my dual fuel qualify as a range or a single oven?
 
seen that before 50 amp max could be referring to the use of taps but in your case being a single feed ?
 
Dennis Alwon said:
Why would it be allowed to have a 50 amp cir. on this unit? I didn't do it but it seems like I could. I just don't know where the NEC stands on this. Load is 24 amps. Why should I be allowed to go to 40 or 50 amps.
Click to expand...

It would be interesting to see what the manufacturer has to say about it.

Can't see how what you've done is a problem, as far as load is concerned.
 
Dennis Alwon said:
Firstly, is this a range as stated in note 4? It is not all electric so.....????
or do I calculate this as a wall oven using note 4 which means the nameplate?
Click to expand...

Is it a question of classifying the appliance?

For the sake of argument, let's define "Range," as it applies to Note 4.
 
frizbeedog said:
Is it a question of classifying the appliance?

For the sake of argument, let's define "Range," as it applies to Note 4.
Click to expand...

You see this doesn't really matter however it could. According to Note 4 a wall mounted oven must use athe nameplate rating of the appliance. Interesting enough the nameplate is almost the same as if it were a range using Col.B. (80%).

So if the total connected load is 6840 watts-- equivalent to 29 amps then why is the nameplate 24 amps?
 
Dennis Alwon said:
You see this doesn't really matter however it could. According to Note 4 a wall mounted oven must use athe nameplate rating of the appliance. Interesting enough the nameplate is almost the same as if it were a range using Col.B. (80%).

So if the total connected load is 6840 watts-- equivalent to 29 amps then why is the nameplate 24 amps?
Click to expand...

I may be misunderstanding this, but as I read it column B doesn't apply to a single "range."

I could be wrong, but I think your calc. is wrong.

Note 4 is the only place where it addresses a single range. All other notes imply multiple appliances.....untill you look at the table. :wink:

Confusing table.





I'm cooking the crow for dinner now. :grin:
 
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