Wiring a subpanel question

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  #1  
Old 03-20-06, 06:26 AM
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Wiring a subpanel question

Hello,
My question is this: I already have a 220v sub panel in my garage. It is wired through a 50amp double pole breaker from my main panel with 8/3 wire with ground. Now I want to wire 2 220v recepticles one with a 50amp breaker and one with a 20amp breaker. My question is can I use the same 8/3 wire and change my 50amp breaker in the main cabinet with a 100amp breaker or do I need to run a different wire for this 100amp breaker?
Right now the sub panel runs just 110v to some lights and outlets.
Any help would be great.
Thanks
 
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  #2  
Old 03-20-06, 06:30 AM
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No, you cannot use the same cable for a larger sub panel. You may not even be able to use the same sub panel.

You may have several options, depending on whether this is an attached or detached garage.
 
  #3  
Old 03-20-06, 06:46 AM
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Different sub panel

Hi,
I forgot to add that I would be using a different sub panel.
It is a detached garage. What size wire would I need to run? and with the new panel would I still be able to run my 110v lights and outlets?\
Thanks for you help
 
  #4  
Old 03-20-06, 06:56 AM
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With a detached garage, you need to replace the existing sub panel run completely.

You will need probably #3 or #4 copper wire. Your choice will also depend on whether you use a UF cable or conduit and THWN. I don't have books here, so can't answer completely.

With a 100 amp sub panel fed at 100 amps, you should be able to run your 50 amp and 20 amp 240 volt loads and still have plenty of power for your 120 volt loads.
 
  #5  
Old 03-20-06, 07:17 AM
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thanks

Thanks for the help
 
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