GRND. SIZE OF 225 KVA FRMER

[Toros]

HI,
THE ENGINEERING PLAN CALLS 3/0 CU GRND ELECTR. ROD ON A 225 KVA , 480V- 120/208V 3PH. XFRMER

CAN GET ANY SMALLER THAN THAT?????

TANX

 

[Smart $]

HI,
THE ENGINEERING PLAN CALLS 3/0 CU GRND ELECTR. ROD ON A 225 KVA , 480V- 120/208V 3PH. XFRMER

CAN GET ANY SMALLER THAN THAT?????

TANX

For sole connection to a single ground rod, yes... #6 per 250.66(A).

However, you typically cannot alter installation requirements of EE/PE stamped plans without going through the revision process or its equivalent.

 

[infinity]

HI,
THE ENGINEERING PLAN CALLS 3/0 CU GRND ELECTR. ROD ON A 225 KVA , 480V- 120/208V 3PH. XFRMER

CAN GET ANY SMALLER THAN THAT?????

TANX

What size are the secondary conductors? (Please turn off the caps lock.)

 

[Ponchik]

I think the EE used 250.66 and based the 3/0 on the secondary conductor size.

Is this a service or Separately drive system?

Is it calling for the 3/0 to go to water bond first then the grounding electrode?

Could be a simple mistake. Just call him/her and ask why the 3/0?

 

[iwire]

Or, seeing as it is in the design and you are getting paid to do it just install what is requested.