Main panel Upgrade - 100 Amp to 200 Amp

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  #1  
Old 11-10-06, 05:48 AM
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Main panel Upgrade - 100 Amp to 200 Amp

I have a few questions:

What is the minimum size conductor?
What is the minimum size neutral?
What size conduit is needed to the main panel?

Are there any other changes that are needed other than the new panel and a 200 Amp main breaker...?

Much thanks...
 
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  #2  
Old 11-10-06, 09:01 AM
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> What is the minimum size conductor?

#2/0 Copper or #4/0 Aluminum; but should be upsized if the distance is long.

> What is the minimum size neutral?

Depends on the calculated load. I don't recommend installing undersized neutrals.

> What size conduit is needed to the main panel?

Usually 1-1/2" schedule 80 PVC for the copper conductors, or 2" PVC80 for the aluminum conductors. However, the local power company may override this. If there is a service mast, it should be 2" RMC or IMC to the meter box.

> Are there any other changes that are needed other
> than the new panel and a 200 Amp main breaker

All grounding and bonding must be brought up to code; which requires at the very minimum running a #4 copper GEC from the panel to the water pipe entrance and driving an 8'x5/8" copper ground rod connected with #6 copper. Some jurisdictions require AFCI breakers for bedroom circuits. The meter box (and sometimes meter) need to be replaced as well.
 
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Old 11-10-06, 04:52 PM
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Thanks Ben...

I appreciate the info.

So, a #2/0 Copper for a neutral would suffice?

I have a 1 & 3/4" metal conduit running from the meter panel to the main panel - approximately 40 feet. So, I guess this is OK?

Thanks again,

MNS
 
  #4  
Old 11-10-06, 05:17 PM
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From the drop, (you need a 200 amp meter socket,) 3 #2/0 Down.
200 Amp disconnect 3 #2/0 to it from the meter. From there 3#2/0 and a #6 (copper) ground to the panel.,1- 8' x5/8 ground rod (driven 8') connected to the neutral bus at disco/meter.. new 200A panel. 1- 200 amp main lug panel. 1 #6 copper ground from ground bus to water main, with the water meter jumperd.

Aside from that, your all good.
 
  #5  
Old 11-10-06, 07:08 PM
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IP, Why not use an undersized neutral for residential services? I can't even buy URD or SEU cable with a full size neutral.
It is all but guaranteed that a good portion of the load will be balanced.

Just curious as to your reasoning.
 
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