Wall Oven Whip

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infinity

infinity

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Looking at this wall oven which came from the supplier with a cord and plug connection. I can't recall seeing this type of oven with a cord and plug only hardwired with a factory whip. Looking at the way it's installed (a strap that is large enough for a FMC whip) it's my guess that someone removed the factory whip and installed the cord. Factory whips usually have higher temperature conductors than cord sets and these ovens are not designed for cord an plug. Opinions?

Walloven1.jpg

Walloven2.jpg
 
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infinity said:
Looking at this wall oven which came from the supplier with a code and plug connection. I can't recall seeing this type of oven with a cord and plug only hardwired with a factory whip. Looking at the way it's installed (a strap that is large enough for a FMC whip) it's my guess that someone removed the factory whip and installed the cord. Factory whips usually have higher temperature conductors than cord sets and these ovens are not designed for cord an plug. Opinions?

View attachment 20501

View attachment 20502
Click to expand...


Vendor data shows fixed connection, no plug.
 
goldstar said:
Flex is an armored cable (i.e MC or AC cable).
Click to expand...


Or FMC (flexible metal conduit)-- flex is a metallic conduit with no conductors in it. Of course, there are conductors in the flex coming from the back of the range but as Trevor stated the wires are usually a higher temperature conductor.
 
At first glance it looked like a single wall oven which in most cases would require a 30A circuit. However, looking at the KW rating on the nameplate it's 6.4 KW. 6400 divided by 240V = 26 A. 80% of a 30A circuit would be 24A. So, you'll have to go to the next trade size and use a 40A circuit. That being said, I don't know if you'll have the room to mount a 50A receptacle behind the oven. If not, I'd cut the plug off, wire it direct and drop the JB inside the wall.
 
goldstar said:
At first glance it looked like a single wall oven which in most cases would require a 30A circuit. However, looking at the KW rating on the nameplate it's 6.4 KW. 6400 divided by 240V = 26 A. 80% of a 30A circuit would be 24A. So, you'll have to go to the next trade size and use a 40A circuit. That being said, I don't know if you'll have the room to mount a 50A receptacle behind the oven. If not, I'd cut the plug off, wire it direct and drop the JB inside the wall.
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I don't think an oven Is a continuous load.
 
Dennis Alwon said:
Or FMC (flexible metal conduit)-- flex is a metallic conduit with no conductors in it. Of course, there are conductors in the flex coming from the back of the range but as Trevor stated the wires are usually a higher temperature conductor.
Click to expand...
Thank you both. Always an education here. This for us would be flexible cable or flex.



Wrong colours but you get the idea.
The lead that plugs into a receptacle for for something like a table lamp would also be called a flex.
 
goldstar said:
At first glance it looked like a single wall oven which in most cases would require a 30A circuit. However, looking at the KW rating on the nameplate it's 6.4 KW. 6400 divided by 240V = 26 A. 80% of a 30A circuit would be 24A. So, you'll have to go to the next trade size and use a 40A circuit. That being said, I don't know if you'll have the room to mount a 50A receptacle behind the oven. If not, I'd cut the plug off, wire it direct and drop the JB inside the wall.
Click to expand...

The prints call for a 1 phase, 208 volt, 30 amp circuit with a 4-wire receptacle behind the unit. Someone else is buying the ovens and they're being delivered as pictured with cord and plug which IMO is not permitted because of the temperature rating of the cord conductors and the listing instructions.
 
Besoeker said:
Thank you both. Always an education here. This for us would be flexible cable or flex.



Wrong colours but you get the idea.
The lead that plugs into a receptacle for for something like a table lamp would also be called a flex.
Click to expand...

Many cables, cords etc are flexible but for some reason the term flex came to mean FMC. There is flexible non metallic conduit etc but the one pictured below is what has been termed flex in most areas that I have been in.

flex-product.jpg
 
The only built in ovens I regularly work with that have factory installed cords are Miele. They do this for ease of installation and service by their technicians.
In order to get full warranty coverage Miele employee technicians are supposed to install all of their appliances.
 
Dennis Alwon said:
Many cables, cords etc are flexible but for some reason the term flex came to mean FMC. There is flexible non metallic conduit etc but the one pictured below is what has been termed flex in most areas that I have been in.

flex-product.jpg
Click to expand...
I have seen that used but not in a long while. Oddly the last time was on the connection to the drive motor on a a machine manufacturing Kopex. Kopex is flexible metal conduit.
 
electrofelon said:
I don't think an oven Is a continuous load.
Click to expand...
I'm not sure I agree and I'm not understanding why that would come into play with this unit. If your wife decided to slow cook something for several hours wouldn't that be considered a continuous load?
 
infinity said:
The prints call for a 1 phase, 208 volt, 30 amp circuit with a 4-wire receptacle behind the unit.
Click to expand...
See if you can find the installation instructions on-line before the unit arrives. Maybe it will tell you exactly where to locate the receptacle.
Someone else is buying the ovens and they're being delivered as pictured with cord and plug which IMO is not permitted because of the temperature rating of the cord conductors and the listing instructions.
Click to expand...
If it comes shipped in that way from the factory then that's not your concern, it's the manufacturer's. If they got it through UL with that cord then away we go.
 
goldstar said:
I'm not sure I agree and I'm not understanding why that would come into play with this unit. If your wife decided to slow cook something for several hours wouldn't that be considered a continuous load?
Click to expand...

An oven is not considered a continuous load because it doesn't use full power for 3 hours. The thermostat kicks it on/off enough that the load is not continuous.
 
goldstar said:
See if you can find the installation instructions on-line before the unit arrives. Maybe it will tell you exactly where to locate the receptacle. If it comes shipped in that way from the factory then that's not your concern, it's the manufacturer's. If they got it through UL with that cord then away we go.
Click to expand...

From what I've read these units are only to be used with the factory whip. Someone, probably the store selling them, is re-wiring them with a cord and plug. We're looking a few hundred units that already have a 30 amp receptacle roughed in that are IMO all incorrect.
 
It looks like someone was trying for a 422.16B3, but may have not paid attention to the last paragraph.....

(3) Wall-Mounted Ovens and Counter-Mounted Cooking Units.
Wall-mounted ovens and counter-mounted cooking units
complete with provisions for mounting and for making electri‐
cal connections shall be permitted to be permanently connec‐
ted or, only for ease in servicing or for installation, cord-and-
plug-connected.
A separable connector or a plug and receptacle combination
in the supply line to an oven or cooking unit shall be approved
for the temperature of the space in which it is located.
Click to expand...

~RJ~
 
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