Load Calc-No response from the engineers!

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frogneck77

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Shelton,CT
I am working on a price for a job at a local airport. Site includes:(60) Small personal aircraft hangars each including 1-2 120 volt 20 amp circuits for general maintenence, and 1 100 watt light. Site also includes 1 trailer with A/C, receptacles, lighting, etc. I'm not sure how to figure an overall load calculation for this type of project. Any suggestions would be appreciated!
Thanks, Bill
 
Are you trying to figure out the size of service you need? Your choices are in the range of 100, 200, 400 amps. Without doing any calcs, I can tell you you'll be happy with a 200a service. :)

Or are you talking about sizing a panel? You've got around 6000 watts of power for lights and not more than 120 recepts. The math from there is simple. Don't forget to add some spaces in the panel for the trailer.
 
jerm said:
Are you trying to figure out the size of service you need? Your choices are in the range of 100, 200, 400 amps. Without doing any calcs, I can tell you you'll be happy with a 200a service. :)

Or are you talking about sizing a panel? You've got around 6000 watts of power for lights and not more than 120 recepts. The math from there is simple. Don't forget to add some spaces in the panel for the trailer.
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I have already figured out where I will be placing some sub-panels, and sizing for those-Just a little unsure of the calc for the overall service. Ive already got the meat of the proposal done figuring VD for my longer runs@2000'.
 
frogneck77 said:
HaHa-Come on Marc-What am I looking at? I know youve got a number on the tip of your tongue!
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But he has an honorary engineering degree and can't respond
 
frogneck77 said:
I have already figured out where I will be placing some sub-panels, and sizing for those-Just a little unsure of the calc for the overall service. Ive already got the meat of the proposal done figuring VD for my longer runs@2000'.
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It's not like you have to come up with a number like 178.5. :) Are you thinking you need more than 200 amps? Like I said, the selections your poco has for this size of a project are pretty small.
 
Is someone pressing you for a load calc? With no site lighting, I'm only getting around 66,000va for the hangers and the trailer with no real demand factors applied. Keep in mind that little airplane hangers often turn into small business storefronts of a sort. What you start out with, electricity wise, isn't near how they'll be in 10 years.
 
Im not being pressed for a load calc, just throwing the job out there to see if anyone has experience sizing services for this type of application. The job is mine, and I will probably go with a 400A service to account for tenant add ons,i.e.-additional lighting,block heaters, and whatever else these pilots can dream up . The GC-AKA my mortgage broker,AKA family friend is clueless when it comes to electricaland trusts me to guide him in the right direction. When I dont trust my own judgement %100, I turn to the only additional resource I have-you guys.
Bill
 
n w

n w

<crickets chirping> In any event, sounds like you're on the right track @ 400A. Pilot for 30+ Yrs, there will be add ons (small office space), but unlikely any heavy loads. Mostly lighting and small non-linear. (Watch out for that guy w/ the turret lathe:grin: )
 
If the job is already awarded to you, and is T&M, I would go with the 400A. If you bid the job I would go as small as you can get away with.
 
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