I need alot of help.

[qopanel]

Here is my situation. I am installing a back up generator for a lift station and, the building it sits in has NO steel or water. The footings and foundation were poured before I had the contract, and the floor will have no rebar and has to have a plastic vapor barrier installed over 6" of gravel. The electrical inspector I talked to 4 weeks ago told me to give him a call, and he would walk me though what he wanted for grounding. I called him today to meet me on site, only to find out that he has left, and the City has no electrical inspector to replace him. The print is very genaric and shows no real grounding details. I'm total lost with no steel or water.

Here is the order of the electrical equipment I'm installing.

3phase 480v 200amp meter socket outside. 2 ground rods driven.

70amp fused nema 3r service rated disconnect, mounted next to meter outside.

3pole auto Transfer switch. ( non switched noodle )
480volt 70amp main panel board. Total load 43 amps
15kva transformer.
120/208volt 40amp panel board.

40kva 3phase 480volt generator to back up entire load ( 43amps ) ( I know not to bond the neutral here ).

What should be bonded?
Do I drive a ground rod at the transformer?
Do I need any others?
Should I just use a common EGC for the entire system?

I'M SOOOO LOST......

 

[George Stolz]

Do I drive a ground rod at the transformer?

IMO, no. Connect to the existing ground rods at the meter socket. 250.30(A)(7), exception 1.

Do I need any others?

IMO, no. However, depending on how the Ufer requirement is enforced in your area, under the 2005 you may be forced to include that in your grounding electrode system.

Should I just use a common EGC for the entire system?

I'm unsure what you mean by this.

 

[tom baker]

The 15 KVA trans will need a grounding electrode. Connect it to where ever the system bonding jumper system is installed, either at the trans or first disconnect.
If the 15 KVA trans has wire leads, the system bonding jumper is best installed via the green screw in the panel it feeds In this case, you only need three wires from the trans to its panel
The electrical service will need a grounding electrode, in this case you'll use a ground rod, probably two, connect with 6 AWG or 4 AWG. For the trans, if you read thru 250.30 you'll end up using the service ground rods.
No system bonding jumper at the generator.
The generator will need a green wire for an equipment ground.
Can't help you with the noodle question.

 

[tallgirl]

Spaghetti

Spaghetti

Can't help you with the noodle question.

Switched neutral.

I think he's asking if this is a separately-derived system (the generator) and what he has to do because of that. Because the neutral isn't switched, it's not a separately derived system.

Beyond that, I'm lost.

 

[dcspector]

Switched neutral.

I think he's asking if this is a separately-derived system (the generator) and what he has to do because of that. Because the neutral isn't switched, it's not a separately derived system.

Beyond that, I'm lost.

The OP explains a non SDS as Julie says. The neutral cannot be bonded to Genset frame and the Neutral / Grounding point must be at the SDS ie. Xfrm. 250.30 As Tom quoted. Is Noodle......neutral?

 

[Bea]

Should I just use a common EGC for the entire system?

Refer to 250.30(A)(3) Exception 2