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Old 06-03-2012, 04:56 AM   #1
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


I have bought 140 ft of 8/3 SOW w ground.

My intention is to connect a 4 prong plug into a 50a 220v box at festivals.

The line will be run from the 50a 220v to a concessions trailer using 8/3 SOW with ground.

At the trailer the 8/3 SOW with ground will run into a 2 pole 40 amp breaker.

The 40 amp 2 pole breaker will run to a 110/220v 100 amp load center.

The load center has 6 circuit breakers on two separate poles (20,15,15 and 20,15,15) that will run 12/2 to the outlets. All breakers will run 110. The two poles will not be bridged. Breaker usage: 1) 1500 w 2) 1800 w 3) 252 w 4) 515 w 5) 28 w 6) 194 w.

I am ASSuming that my breakers will not allow me to draw more than 40 amps through the incoming power line even though the festival connection is able to supply 50 amps.

Am I safe?

Diagram link ---> http://www.hstrial-gambinoconcessio....o-gallery.html


Last edited by mgambino; 06-03-2012 at 10:34 AM. Reason: Adding diagram link.
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Old 06-03-2012, 08:37 AM   #2
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


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Originally Posted by mgambino View Post
I have bought 140 ft of 8/3 SOW w ground.

My intention is to connect a 4 prong plug into a 50a 220v box at festivals.

The line will be run from the 50a 220v to a concessions trailer using 8/3 SOW with ground.

At the trailer the 8/3 SOW with ground will run into a 2 pole 40 amp breaker.

The 40 amp 2 pole breaker will run to a 110/220v 100 amp load center.

The load center has 6 circuit breakers on two separate poles (20,15,15 and 20,15,15) that will run 12/2 to the outlets. All breakers will run 110. The two poles will not be bridged. Breaker usage: 1) 1500 w 2) 1800 w 3) 252 w 4) 515 w 5) 28 w 6) 194 w.

I am ASSuming that my breakers will not allow me to draw more than 40 amps through the incoming power line even though the festival connection is able to supply 50 amps.

Am I safe?
The atmosphere you are describing inclines me to believe that the general public will be around this setup? If that is the case, no way you can do this.

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Old 06-03-2012, 08:54 AM   #3
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


Well, can you explain why?

Its 8/3 grounded to a 40 amp main with breakers......the lines running from breakers to recepticles is 12 gauge. All 6 breakers are 20 amp or less.

Your answer is sarcastic but not very helpful
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Old 06-03-2012, 08:57 AM   #4
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


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Originally Posted by mgambino View Post
Well, can you explain why?

Its 8/3 grounded to a 40 amp main with breakers......the lines running from breakers to recepticles is 12 gauge. All 6 breakers are 20 amp or less.

Your answer is sarcastic but not very helpful

It wasn't sarcastic at all, plain and simple you legally cannot perform this work.
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Old 06-03-2012, 09:00 AM   #5
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


Can you be more specific? Why can't I preform this work?
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Old 06-03-2012, 09:02 AM   #6
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


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Originally Posted by mgambino View Post
Can you be more specific? Why can't I preform this work?
You need a license, insurance, permits.... DIY work is only for your OWN property, basically, the law doesn't care if you hurt or kill yourself doing your own stuff on your own house, but when the general public is involved, it's a whole different ball game.

What if someone is hurt or killed, are you going to be able to live with that?
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Old 06-03-2012, 09:07 AM   #7
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


The concession trailer is my own property and a certified electrician checks my wiring and the makes the final connection to the supply. If connections I have not made are unsafe no connection to power is allowed. It is not uncommon for concessionaires to do their own work then get approved by the cert electrician at the event. It is an industry standard. In fact, most of us do plumbing, construction, wiring, accounting, marketing, sales, contract negotiation, painting, signage, design, etc. The health department, building inspectors, and electricians are there to make sure nothing is unsafe. I have full confidence that no one will ever be exposed to unsafe conditions at an event. To date I have never heard of a single electric problem at an event.

I am looking for a straight forward answer as to whether my proposed set up will work or not, if you cannot provide me with the requested information then please refrain from further comments.

Last edited by mgambino; 06-03-2012 at 09:11 AM.
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Old 06-03-2012, 09:07 AM   #8
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


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I am looking for a straight forward answer as to whether my proposed set up will work or not, if you cannot provide me with the requested information then please refrain from further comments.
Not a problem. But why not just ask your certified Electrician what he would do.
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Old 06-03-2012, 09:13 AM   #9
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


I am here asking people for opinions. The certified electrician at my next event will do a final approval. Unfortunately, his services are unavailable to me until then.

I have been told by my local electric supply company that this will work. However, I would never move forward without a second and perhaps third opinion. It is my experience that not every answer a person receives is accurate. Just as all certified electricians are not the same grade.

Last edited by mgambino; 06-03-2012 at 09:17 AM.
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Old 06-03-2012, 09:16 AM   #10
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


I just (quickly) looked over art 525 and the only thing that might be an issue is how you connect to power and the amps city of #8 SOW. You may be required to connect to power via a receptacle instead of hard wiring to a breaker.

8/3 SOW is only rated for 35a. Since 35a is considered a common breaker size, you couldn't fuse it at 40a.
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Old 06-03-2012, 09:24 AM   #11
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


You may be required to install a ground rod or two since this is powering a panel.
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Old 06-03-2012, 09:25 AM   #12
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


I just (quickly) looked over art 525 and the only thing that might be an issue is how you connect to power and the amps city of #8 SOW. You may be required to connect to power via a receptacle instead of hard wiring to a breaker.

8/3 SOW is only rated for 35a. Since 35a is considered a common breaker size, you couldn't fuse it at 40a.

Its a 50amp 220 box at fairground to 8/3 grounded to my trailer where is goes to 40 amp main then individual breakers. 8/3 is rated for 40 amp. I have provided my draw which totals @35 amps. Maybe I am not understanding what you said?

Last edited by mgambino; 06-03-2012 at 09:28 AM.
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Old 06-03-2012, 09:30 AM   #13
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


8-3 w/ground SOW is only rated for 35 amps (table 400.5(A) in the NEC).
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Old 06-03-2012, 09:35 AM   #14
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


Temporary events like festivals also require GFI protection.
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Old 06-03-2012, 09:36 AM   #15
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50 amp 220 over 8/3 with ground to 40 amp double breaker feeding into load center?


The 400.5 A state 40 amps with 2 conductors. GFI is not the issue at hand. Next?


Last edited by mgambino; 06-03-2012 at 09:40 AM.
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