What does this oven draw?

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zinsco

Member
Location
San Diego, CA
These are the specs given for a Convection Oven

Electrical Requirements
120/208V, 20A 60Hz
120/240V, 20A 60Hz

Power Cord
NEMA 14-30 plug, 6 ft

Electrical Rating
5400w (120/240V)
4200w (120/208v)

Total Amps
17.5A (240) / 15.4A (208V)

What does this oven draw at 240V? Is it 20A, 22.5A (5400w), or 17.5A?

As far as the branch circuit, I'm planning on running a 30A because this oven has a 30A power cord, but these specs make no since to me.
 
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MattS87

Senior Member
Location
Yakima, WA
zinsco said:
These are the specs given for a Convection Oven

Electrical Requirements
120/208V, 20A 60Hz
120/240V, 20A 60Hz

Power Cord
NEMA 14-30 plug, 6 ft

Electrical Rating
5400w (120/240V)
4200w (120/208v)

Total Amps
17.5A (240) / 15.4A (208V)

What does this oven draw at 240V? Is it 20A, 22.5A (5400w), or 17.5A?

As far as the branch circuit, I'm planning on running a 30A because this oven has a 30A power cord, but these specs make no since to me.
Click to expand...

The way I read it, it draws 17.5A and manufacturer requires 20A circuit.
 
Little Bill

Little Bill

Moderator
Staff member
Location
Tennessee NEC:2017
Occupation
Semi-Retired Electrician
zinsco said:
Really? Then why the 30A cord and plug and why does it say 5400w which is 22.5A?
Click to expand...

Just a WAG but maybe the mfg used the table 220.55 (or formula for figuring) and used column B @ 80%
5400W/240=22.50A
22.50x80%=18A
17.5 or 18, still requires a 20A

As for the 14-30P, I can only guess they needed a 4-pole and the 14-30 is more common and heavier built than the 14-20.
 
Coppersmith

Coppersmith

Senior Member
Location
Tampa, FL, USA
Occupation
Electrical Contractor
You're right. That is confusing.

I would run #10 wire but put it on a 20 amp breaker. If it really is a 20 amp circuit, the upsized wire won't hurt and the 20 amp breaker will make it safe. If the breaker starts tripping during use, that will tell you perhaps it's supposed to be a bigger circuit and further research can be performed to confirm.
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
#10 conductors, 20 amp OCPD and a 30 amp receptacle would be code complaint. You could also substitute #12 conductors for the #10's.
 
kwired

kwired

Electron manager
Location
NE Nebraska
Dennis Alwon said:
Section 210.21(B)(2) states a cord and plug of 20 amps cannot have more than a 16 amp load
Click to expand...
Does not apply to a circuit supplying only one receptacle. Don't really know why though. Load for any specific appliance imposed on the receptacle itself is same whether it is single our multi-outlet circuit.

infinity said:
What if you used a single 20 amp receptacle?
Click to expand...
complies with (B)(1)
 
R

Russs57

Senior Member
Location
Miami, Florida, USA
Occupation
Maintenance Engineer
I vote #10 wire on a 20 amp breaker also. Sometime in the future someone might want that 30 amp receptacle to carry 30 amps. Why make them pull new wire.
 
I

Ingenieur

Senior Member
Location
Earth
Besoeker said:
Still doesn't make sense. You can't get more watts out than you put in.
Click to expand...
really? lol as in conservation of energy

directly from the manual if that is the unit
much like vacuum or small compressor hp ratings

that is not the electrical connected load
the 4200/5400w is the effective cooking 'power'

I would use #10 with a 20/2 (25/2?)
 
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