Originally Posted by boman47k
You know the feeder from the transformer/pole will have to be upgrade too, right? More money but well worth it imo. Had mine upgrade a few years back from 100amp fuses to 200 amp breakers. MOre room for expansion if needed. Money well spent. Although if I had it to do over, I would do it myself and save about $500.
The POCO will decide if these wires need to be replaced. Often times they do not. They use a different set of rules to calculate amperage then we do.
Would 8/3 not handle 60 amp subpanel?
The reason I ask is 8/3 was run from my house to my shop and I have noticed the lights dimming at times when it didn't seem to be enough being used to cause it. Shop is about 25' from the house. The shop is not actually that far. I figure about 25 to 30 feet of 8/3 between the main and the panel i n the shop.
If run in romex or a direct burry cable that #8 would need to be on a 40 amp breaker. If run using thhn/thwn it would need to be on a 50 amp breaker. Either could be run to a 60 amp panel. The panel can be larger rating than the circuit as long as the circuit is protected based on the wire size.
As for the voltage drop thing, the wire from the main panel to the house also comes into play, so what all is being used in the main house at the time you are experiencing a problem is also a factor.
You could also have a grounding or other issue that you need to address. number 8 should be able to go about 75 to 100 feet before VD becomes an issue.