overhead service ??

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tryinghard said:
I am trying to show a conservative - high - yet realistic calculation. The calculation will often fool ya (I know it does me) and its just fine to run with it. I calculated the micro/hood as if I knew it was fixed rather than portable. Are you sure about the garage?

I also figured a 3.5 ton heat pump and I would not normally guess at this either but I'm almost certain a 2000 sq ft home will not use over a 2.5 ton (4400 VA)
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I have another post about load calcs in my head, I wasn't thinking detached garage/shop. I was thinking attached to house garage space.
 
there is no attached garage, if they add a furnace/ heat pump later, i believe you need to add the largest load to your calc that why i added 18k, most heat system i've worked on won't let the heat pump run if the emergency heat strips are energized.
thanks again
 
acrwc10 said:
...This would put you under a 100amp main.:D
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You could get the house at 100A by just changing the heat pump to a 3 ton (4700 VA)
  • 18,755 - Total General Load
  • 4700 - Heat Pump, 3 ton
  • 23,455 - Total VA
  • 98 - Total Calculated Load Amperes

rickls' also adding 3VA per sq ft for lighting in the shop (which is a non-dwelling), a non-dwelling shop calculates the actual lighting not projected - extra can be added though. It would be hard to install 20 receptacles in a shop this size and, because it's a homeowners shop, it will most likely be a single person using it rather than multiple.

The load calculation accounts for sporadic, projected, multiple, and occasional loads. The calculation really can be trusted and it will keep the service, distribution, feeders, bonding/grounding, costs...realistically sized.
 
rickl said:
there is no attached garage, if they add a furnace/ heat pump later, i believe you need to add the largest load to your calc that why i added 18k, most heat system i've worked on won't let the heat pump run if the emergency heat strips are energized.
thanks again
Click to expand...

That's true about the largest load of either heat or air conditioning. Ask an HVAC contractor/supplier about some different size loads for heat pump units these will be labeled for the largest load. It would be extremely difficult to install 18 KVA of heating in a 2000 sq ft house though.
 
in all reality the furnace would probably be around 12k,
{ also adding 3VA per sq ft for lighting in the shop (which is a non-dwelling), a non-dwelling shop calculates the actual lighting not projected } yeah your right on that, i'm not sure where i got the 3va sq ft at

talk to the inspector today, he has no problem with using 350 alum up the mast using table 310.15(b)(6), also he said i could splice my gec at the existing ground rod and tie all 3 ground rods together. as long as each gec has there own clamp

thanks
 
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