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Old 09-21-2012, 07:09 AM   #1
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Electrical Service Wire

I am thinking about upgrading my service panel from 100 amps to 200 amps. How do I tell what amperage my service wire can handle so i can determine if I need to upgrade it?



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Old 09-21-2012, 07:46 AM   #2
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Normally the ampacity of the service cable is the same as the main breaker rating. If larger cable is installed there is only increased cost, but no benefit.


Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 09-21-2012, 07:59 AM   #3
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NEC Table 310-16 shows ampacity for copper and aluminum conductors. Here's a link: http://www.houwire.com/products/tech...cle310_16.html

Check the size of your service entry and see where it sits on the table. Don't forget to use the right temperature rating and check local code for things like ground and neutral size requirements (relative to the live conductors).
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Old 09-21-2012, 08:34 AM   #4
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Your meter box will most likely need upgraded too.
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Old 09-21-2012, 03:09 PM   #5
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If you now have a 100A service EVERYTHING from the connections at the top, down to the meter pan, the meter pan itself, service entrance cable, panel, grounding & bonding, MUST be replaced to upgrade to 200A.
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
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