ECN Forum Forums General Topics of the Trade General Discussion Area Very strange single line diagram?

I was thinking of the availability of the material. 250 is pretty common, & if the pulls are short there wouldn't be a considerable ammount of extra labor...as for the metering setup. The POCO here places the CT's right over the secondary spades in the Padmount, & I've changed out transformers before without involving the Metering Dept. You simply unbolt all of your paddles, and slide the CT's over the paddles, & down the conductor. Works great, & is really quick !

I agree and I tried to get our local POCO to see it that way too, but they did not want to budge.

I do know it is not the same all over.

Bob

Boy, we're worlds apart!! !! !!, but I figured it must be a Back East kind of thing. (The plans came from GA)
Do your meter bases mount right on the transformer, or do they mount on pedestals?? (Lame Californian)

Here the contractor supplies the primary and secondary conduits, installed (including concrete encasement if more than 2 conduits in parallel) Also, we're responsible for the transformer pad, bedded in gravel, and grounding (2 rods and a length of conductor coming up through the window in the bottom of the pad) for the transformer.
This then becomes the POCO's property.

All specifications for duct sizes, numbers, routing will be determined by the POCO.
(Although I haven't seen 4-1/2" used, they'll want 4" or 5")

The secondaries will run to a utility pull section mounted on the side of the service.

From there, they'll run to a section that will contain the meters, CTs, and be bussed to a main C/B or fusible switch, probably in the same section as the metering (with a barrier between).

The POCO will supply and install the transformer and cable.

The "coordinate with power company prior to bid" is pretty funny. The POCO people barely have enough time for the people that are doing jobs, much less everybody that's even bidding one...S

Have seen this more often lately on plans around here. I guess some lazy engineering type are using a canned drawing instead of doing thier job of design for EACH project.
I just look up our POCO's spec book to see how they want the service set up. In this area,the EC is responsible for the primary conduit, transformer pad per the POCO's drawings, the secondary conduit and wire and a CT can properly sized, also the installation of the meter socket and CT's. We also do all the grounding.
By the way that triangle ground grid frequently fails testing in some of our soils. It has been the subject of some very intense discussions about ground resistance specifications and who is going to pay for the fix.
The 4 1/2" conduit would become 4" with an alternate for 5" in my proposal.

I also took a picture of the ground detail. 3 rods and a loop of 4/0. Very different than we do it.
I'll put it up. Tomorrow.

Normally, we'd put in a GEC sized copper Ufer and bond all the "regular" stuff.
If the plans were approved with this 3 rod thing, we'd be required to put it in, too.

That is a standard CT setup for anything over 600A here in GA. The only thing i see different is we set the CT can away from the xfmr pad (dig the footing and pour it).

GA Power (Southern Company) provides the primaries, transformer, pad, CT can and pedestal. We provide the shovel, sacrete, pipe and secondary conductors.

Company policy is three phase you go to them, and single phase they come to you.

Out West, many electric utilities adopt EUSERC service-entrance standards, where generally the utilities provide only components that they install inside metering compartments, but not sockets. [www.euserc.com—looks like ~6 pages of member organizations] In those areas, instead of utility-furnished sockets that are stanchion-mounted by contractors and ‘Grecian urn’ CTs in a padmount transformer, bussed metering bar-CT/PT/meter/test-switch [and cable-pull] sections are provided meeting utility specs.

These days, PDF files on web sites simplify the process.

A few snapshots.. http://www.themeterguy.com/photogallery/freestd400.JPG http://www.themeterguy.com/photogallery/donutctjob.JPG http://www.themeterguy.com/photogallery/donutct2000.JPG http://www.themeterguy.com/photogallery/dnutctswired.JPG http://www.socket-two-me.com/images/vtpacka.jpg http://www.themeterguy.com/photogallery/400ampgear.JPG http://www.themeterguy.com/photogallery/lotsawire.jpg http://www.themeterguy.com/photogallery/servwire.jpg

Besides the 4-½" Duct size Note (obviously an error), I have never done (or even seen) any permanent installs with the KWH meter at the PoCo Transformer.

Is this a "Non-California" thing?

As Scott (Electure) knows - along with the other So. Cal. Members here, rarely do we install Secondary Feeders to the PoCo Transformer Vault - or even pole via Riser Ducts.
Anaheim is one area where we do install Secondary Feeders between the PoCo's Transformer Vault / Riser at the Pole, and the Pull Section of the main service / Switch Gear.
Other areas, we just provide Primary and Secondary side Ducts with pull ropes (mandrell ducts too), and the PoCo does the rest.

Also, the Duct requirements are given by the PoCo - as mentioned by Scott (Electure).

Gotta love that GES!!! Quite an elaborate setup, isn't it!

Scott35

p.s. Forgot to mention this also includes purchasing + setting the Transformer Vaults, GES at the Vaults, and all the required stuff for the Primary and Secondary Feeder Ducts per the PoCo's request.
This includes Anaheim also!

Did some Primary Feeder Underground Ducts on a rather steep hill once. Was really "Fun" putting the Sand and Gravel in for the Cushion! (Fun Read: PITA!!!).

Gluing the Ducts was less fun - trying to keep the can from rolling down the hill became an art form!

Keeping from "Getting High" on the fumes, then rolling down the hill, was a concern too...

Wasn't around when (if) the Concrete got pumped into the Trench for the Primary Ducts - busy playing around on some other Projects...

Scott35

Returned and edited to add the above stuff.

[This message has been edited by Scott35 (edited 03-21-2004).]

It is possible that the utility wanted to primary meter, hence the location of the meter.
I've never seen a set of service entrance drawings, local or not, that did not require the electrician to coordinate with the Utility Company, and include all related costs.
Nobody knows the local utility requirements better than the local electricians.