residential subdivision elec power design
residential subdivision elec power design
(OP)
We are involved as civil engineers on site development. Usually the local electrical company does the electric service design af final plan stage. For preparing preliminary cost estimates for various site layout options, we would like some guidelines as to several issue... like spacings/locations of transformer/pads, some unit costs or wire size one would use in a single family development of say 20 half acre lots. The elec is buried service. Any thoughts would be appreciated.. just looking for some rough design parameters that electrical guys see & use. This way we can factor in the electrical as a per lot cost for that particular layout scheme.






RE: residential subdivision elec power design
RE: residential subdivision elec power design
It is very hard for us to come up with those numbers for you. Let me explain.
Local cost of living is a big one. Where I live a 700sqft fixer-upper goes for $725K. The equipment/installation here will go for several times what it would cost elsewhere. The weather has a great deal to do with the price as air conditioning jacks up energy requirements greatly, changing transformer spacing/numbers. Also the local utility may desire a specific size transformer that changes the spacing. Local authorities may have requirements that change costs. Houses may each have a well which will change things. Electric heat? The list goes on and on.
If you go to a local EE that does this for a living, he knows all these details implicitly and could probably give you a very good number or at least a ball park number. A number that accounts for the local economy.
You will also gain a relationship with someone you will ultimately need to help you. And if he/she doesn't help you you know who to avoid when you need the actual work done.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: residential subdivision elec power design
RE: residential subdivision elec power design
If all else fails, figure on No. 2 aluminum AWG primary URD cable with full concentric neutral, jacketed. One padmount transformer for every four lots. You didn't ask about transformer size, so I assume that the utility is installing the transformers.
RE: residential subdivision elec power design
RE: residential subdivision elec power design
Best of luck
RE: residential subdivision elec power design
the lots are and how far back will the houses sit from the curb. If the lots are very wide you will have transformers on every other lot line. feed back some distances.
RE: residential subdivision elec power design
RE: residential subdivision elec power design
Transformers: One Padmount transformer - 50KVA every 4 lot lines feeding 8 houses. Single phase 7620/120-240Volts. For every transformer you need a pad, it could be concrete, fiberglass, etc.
Underground wiring: To feed transformers use 1/0 Aluminum Underground 15KV on one side of the street. [Use same lenght you got for sidewalk divided by two], plus 2" grey conduit schedule 40. For each transformer add one secondary box typle flushmount and secondary wire to cross the street, let's say 500MCM Al Triplex Underground, plus 4" grey conduit schedule 40 also. For this crossing use the lenght of the right of way.
Hope this help!
[There are many things we're missing here but transformers and primary wire are the most expensive]
RE: residential subdivision elec power design