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Old 11-28-2012, 10:09 AM   #76
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Help with new 220V sub panel circuit


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Originally Posted by darkbreeze View Post
Well, I guess I stand corrected on the exception. I thought I had you for sure on that. Better to know for certain though I guess. I suppose I'm just going to have to put the compressor outside the building. I must say, that is a fundamentally stupid rule. It makes no sense, at least to me, that you can have, let's say, ten or fifteen different circuits from the panel branching out throughout the house, but only one to anything that is not the house. I see no justification for the rule in regards to safety as long as everything is properly configured regarding amperages, connections, support, materials and water tight joinery, it should be allowed, especially if the intended use would exceed the amperage specified for a single circuit. You could easily use two circuits to supply the needed voltage and amperage while not exceeding the rated spec for each individual branch or the overall for the main panel. Makes about as much sense as the laws requiring all children under the age of 8 to be in a car seat. I know 7 year olds that are bigger than some ten year olds and vice versa. Well, it is what it is I guess. Thanks to everybody for your help and input. I'm resigned I suppose.

Remember the NFPA (National Fire Protection Association) that compromises the Code Making Panels that write the National Electrical Code are not interested in design. They are interested in the minimum safety standards for electrical installations. As you can tell the language used by these professionals is sometimes very difficult to understand the intent without many years of experience and then you still don't understand. Many of the professional forums spend 90% of their time trying to figure out what is meant by particular article in the NEC. You simply don't know what you don't know because most electricians spend a great deal of their time in specific environments. In other words a commercial electrician or industrial electrician may be very weak in knowledge about residential requirements. I fell in that catagory for many years.
I guess what I am leading up to is that the NFPA is concerned that everyone needs to know how to deenergize the electrical to a remote structure or building in the event of fire or emergency. In residences where you start running branch circuits and feeders every which way to a detached building it becomes difficult for emergency personnel to know that they have killed all power to that building. This is one of the first things the fire department is interested in when they show up on scene during a fire or some life threatening event. The NFPA could really care less how you power your detached garage or shop they just want to know how to get the electricity turned off to everything their people may come in contact. So they make "rules" to insure that will be an easier process. So they are all about safety and set the "rules" for wire ampacity .. so on and so forth.


Probably the best advice is during DIY electrical installations is to check with local authority in your building department for the correct answers. As you have already found out ...professionals can differ in opinion ...
As you have surmised there really is nothing dangerous with what you proposed early on in this thread it just isn't considered a safe practice due to the fact it takes multiple disconnects which is not something the NEC is found of in single family environments when power is distributed to detached garages,sheds, shops etc..

Good luck with your project


Last edited by Stubbie; 11-28-2012 at 11:43 PM. Reason: spellin
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Old 11-30-2012, 12:43 AM   #77
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Help with new 220V sub panel circuit


Project is complete. Compressor works great. All to code, except maybe the gray area of the line running to the compressor outside but I'm good with it. Thanks to all who helped.
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Old 11-30-2012, 11:28 PM   #78
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Help with new 220V sub panel circuit


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Originally Posted by darkbreeze View Post
Project is complete. Compressor works great. All to code, except maybe the gray area of the line running to the compressor outside but I'm good with it. Thanks to all who helped.
Thanks for letting us know the update with the sitaution you have there.

But just remember to drain the tank more often espcally in frezzing tempture range that is crictal for good performace.

Note it is not too uncommon to see a bit of water accumated no matter what the tempture it will be so in wintertime you will have to check more often and when you get done for the day or done running the compressour drain the tank to get any water out right away.


Merci,
Marc
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Old 12-02-2012, 01:15 AM   #79
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Help with new 220V sub panel circuit


Thanks Marc, but that part I've got covered. I've either owned, operated or worked in, automotive repair facilities for the last twenty years so I'm very familiar with the use of the equiptment, even with the connection and installation of the equiptment, I was just weak in the area of getting power to the equiptment. Thanks though. Take care.

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