Units are 1530 Sq ft. gas furnaces gas ranges elect. dryers 240v 20amp Central AC Dish washers Garbage Disposals Microwave Some (eight) w/ 120v 20amp whirlpool tubs Some (seven) w/ 120v 5.6amp trash compactors
1 House panel for outside lighting and outlet power for maintenance Load is approximately 30-50 amps not continuous.
There are two seperate 22 unit buildings. The meters are currently located outside and they will remain outside. One buildings meters will be relocated to a new location on the other end of the building. The other buildings meter location will not change unless new service equipment cannot meet clearances. The space is 47 inches deep with a window above at approximately 8 feet.
1) Just checking my math. What is the demand for each unit? What is the service size?
2) From the service equipment there are long runs to each panel location. Can I put multiple feeders in one pipe. Do I have to derate or does the standard wire size for services allow me to maintain that size wire not needing to account for derating. Am I correct in thinking that emt will surfice for a ground eliminating the need for this wire.
3) The owners would like to keep their existing panels as most of them are rated 125amps. Those that are not will be changed (apprx.6). They are existing equipment so would this pass code requirements despite the neutrals and grounds being mixed together and the age of the equipment (20-30yrs).
4) Where would you price out the meter bank (national/local supply house) My two local supply houses don't have a lot of experience with this size project. Should I ask for "In House Sales", "Outside"? Any recommendations for best service equipment to use.
I'll post the calculations I came up with tomorrow in hopes that someone would be able to give me some valuable reply. Sierra is correct in thinking I don't have any experience with a project this size however I have only been self employeed for a year and would appreciate any help from those willing.
Anyone able to give me their perspective on the other questions with code or experience insight I would be appreciative of their response.
Re: 22 unit condos Service Upgrade#6301503/05/0609:27 AM
I did not check all the math, but it appears Ok....
Now for the challenge of building it. And, how to keep everyone happy while changing it over.
You'll need to coordinate that well ahead of time, and would advise both services be built in new locations (Preferably closer to the existing as possible), inspected, and ready for change over. Make a good friend in your POCO reps, and let them know what you're doing and plan it out well with them. So you can make sure all of thier requirements are met.
Most of the services that I have done in this type of size were new in empty buildings. Only one was an up-grade of an existing. And the POCO was nice enough to leave both energized for change over.
Either way most of your time on this will be hand shaking and site meetings that you will need to pay yourself for.
And before you even shop for gear, it would be wise to get an EE to spec your feeders and AIC ratings. So you can double and triple check to see if what your ordering will be sufficient.
Put some beefy allowances in contract for those... Sounds like fun?
Mark Heller "Well - I oughta....." -Jackie Gleason
Re: 22 unit condos Service Upgrade#6301703/05/0602:24 PM
Thank you all for the info. George I further cleaned up a couple of errors that you pointed out and had a couple more questions on the type of wire and derating on the "linked" site. Any suggestions on where to find an electrical engineer. The Yellow pages, supply house word of mouth?
One of the buildings is located in such a way that I think I can only replace at the existing location but I check yet again. I was starting to wonder how I was going to keep power on in that building.
Thank you all for your comments.
Re: 22 unit condos Service Upgrade#6302003/06/0603:18 AM