work shop

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jimwalker

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TAMPA FLORIDA
Is there any violation to add another 20 amp 120/240 to a shed.It has 3 runs of #10 plus ground in 3/4 pvc now that splits to run 2 AC window units and 4 outlets now.Will need more outlets to be doing some computer repairs in it.New ditch needs dug anyways for water line,cable,phone,and data.? I would rather not repull larger wires in the 3/4.Also i have plenty of #10 wire in stock so would rather use it up
 
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"II. More Than One Building or Other Structure

225.30 Number of Supplies. Where more than one building or other structure is on the same property and under single management, each additional building or other structure
served that is on the load side of the service disconnecting means shall be supplied by one feeder or branch circuit unless permitted in 225.30(A) through (E). For the purpose of this section, a multiwire branch circuit shall be
considered a single circuit."
 
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Ok guess thats out of the question.Can #10's be paralled to up the amperage to a sub panel from the house ? I am thinking there is a minimum size to parallel :confused:
 
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u know what you got to do,get up off that wallet and give up some of that money.

There waiting for you @ big orange.U can park up front too..
 
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Thanks for fast replies.Looks like i am stuck with running number 8 copper or 6 alum.Was hoping for a way out of this but it needs to stay legal.Lots of #10 just no number 8 :mad: :mad: :mad:

[ September 03, 2005, 12:10 AM: Message edited by: jimwalker ]
 
Re: work shop

ok can i do this ?
Use the 3 number 10's and ground to feed a subpanel in shed and breaker them at house on 2 pole 30.Then at shed install 4 single pole 20 breakers.Drive a ground rod at shed.All thats needed is to run 2 small 5,000 btu units in summer and perhaps 2 small portable space heaters in winter (yes it gets cold here too ;) )This leaves us 2 circuits for actual computer repairs.Last thing i want is to dig up my yard .Any creative ways out of this ?
 
Re: work shop

Originally posted by jimwalker:
ok can i do this ?
Use the 3 number 10's and ground to feed a subpanel in shed and breaker them at house on 2 pole 30.Then at shed install 4 single pole 20 breakers.Drive a ground rod at shed.All thats needed is to run 2 small 5,000 btu units in summer and perhaps 2 small portable space heaters in winter (yes it gets cold here too :D
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Re: work shop

Originally posted by jeff43222:
The 2002 version of 225.39(B) says that you can use a 30A feeder only if your subpanel has no more than two 2-wire branch circuits. 225.39(D) says that if you want more than two circuits in your subpanel, it will require a minimum of 60A for the feeder.
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Look again all those sections specify is the rating of the disconnecting means.

Those sections do not mention overcurrent protection or conductor sizes. ;)

Matter of fact look at the title of those sections.

225.39 Rating of Disconnect.
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Install a 60 amp main breaker panel fed with the 10 AWG and a 30 amp breaker inside the main building and you will be in compliance.

[ September 03, 2005, 02:50 PM: Message edited by: iwire ]
 
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Then what's the point of 225.39? Why even have a size for the disconnecting means if the overcurrent protection for the feeder is going to be handled from a breaker in the main panel?
 
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Originally posted by jeff43222:
Then what's the point of 225.39?
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I don't have a clue.

But do you see what I mean?

A disconnecting means is not the determining factor of conductor sizes or overcurrent protection.

No one said it has to make sense. :confused:
 
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I do see your point. I also agree that it doesn't make sense to require a 60A disconnect for a subpanel that is being fed with #10 wires. I guess the installation you described would indeed be code compliant.
 
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Jeff I have as much trouble with that section as anyone.

I'm either misunderstanding the requirements of 225.39 (and 230.79 for that matter) entirely or I just can't see the point of either of those sections. :confused:

Bob
 
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On this topic NEC does not make any sense.

In a similar situation I had 4 circuits on 30 amps brakers and the inspector accepted it only after I combined them in 2 circuits.

Why the number of circuits dictates the size and the protection of the feeder for an outside building - there should be some logic???
 
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Where i get confused is that i was permitted to have a multi circuit without even a ground rod or disconnect.So why would a 30 amp feed to a sub panel not be safer.No chance of overload.All i need is 1 or 2 circuits to operate maybe 6 computers at a time.Seems bit crazy to go spend major money to just gain a few thousand watts.Can almost get by without even doing anything.Maybe we are back to attaching this building to the house.HMMMM 100 feet divided by 8 foot 2x4
 
Re: work shop

Originally posted by jimwalker:
Where i get confused is that i was permitted to have a multi circuit without even a ground rod or disconnect.
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I can't explain the ground rod but even the multiwire branch circuit does require a disconnecting means at the shed, a regular 2 pole switch would do it.
 
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