60 amp plug on 40 amp circuit

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tom baker

tom baker

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A email question that I will post here for you all to help with:

"My common sense is telling me it would be improper to place a 60 amp
plug on a 40 amp circuit. My problem is I can't find the portion of the
NEC which addresses this situation. Can you provide some insight? Many
many thanks for the help."

I replied 210.21 (B). And see 210.21(B)(3).
 
How can 110.14(2) be met, 2- # 6 under a blue wire nut... ? ?

60 Amp on a Cord nope.. ?
 
Why have labeled cord if your not going to use it correctly !

Yes I realize it not 60 AMP end use service ...
 
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Me, NO

Me, NO

Heavy commerical here, Big I thought the question was aready posted !
Most of my work is scripted!

One check of Blue wire nuts via a search

One manufactures :

| 100 PACK BLUE WIRE NUTS STRIP SOLID WIRE 3/8" STRIP STRANDED
| WIRE 7/16" 105 DEGREES C (MAX) 300v MAX

Ideal's
Wing-Nut? Wire Connectors have built-in contoured wings to provide a secure grip for extra leverage. Live-action, square-wire springs expand to accept a broader range of wire shapes and sizes with no pre-twisting required. Deep skirts help protect against flash-over and turned-back strands for maximum dielectric protection. Rated for 600 V maximum. These reusable, flame-retardant shell are rated for 221? F (105? C). Use the blue 454? Wing Nuts fit #14-#6 AWG wire configurations. Item 30-454 comes as a box of 50 Wing Nuts.

Had a coment once from an inspector that Blues where for larger size and not for increased wire count. So I split the wires added a jumper and used two blues...:rolleyes:
 
stickboy1375 said:
Ever install a 40amp breaker on a 50 amp range receptacle?
Click to expand...


And more,

My last project......There was a 50 Amp Range Circuit and the owner bought a new Oven with and separate Cooktop....and Both are rating/requiring 30 Amp only....so, I down grade/decreased an old 50 Amp Circuit to 30 Amp (because of the plug) in this case I just removed the old 50 Amp Breaker and replaced with a 30 Amp Breaker and change the plug to fit for 30 Amp (BUT NOT CHANGING THE WIRE & THE WIRE IS STILL GOOD FOR 50 AMP IF NEEDED FOR LATER) and again same story for the Cooktop (new wiring) using 40 Amp wire rating, but using 30 Amp Breaker & Plug ( I know it cost more for the wires, and this is at the Owner Cost per his requested)


IN THIS CASE U CAN DECREASE THE LOAD, BUT NOT THE WIRING.....
 
The point is many stoves are wired with #8 copper (40 amps) and the receptacle and cord are rated 50 amps. You would not be allowed to use , let's say for example, a dryer cord and receptacle on a 40 amp range unit. That is less than the branch circuit. It cannot be less but it can be more than the branch circuit.

That is like asking can I put a #10 wire on a 20 amp breaker. As long as the lug can handle that size there is no reason not to.
 
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