Doesn't this fall in the Scope for the Utility Company's Design Engineers to specify?
, then submit the standard items to the Utility Design Engineer:
- Load Calcs,
- A site drawing (building footprint),
- A summary of conditions / scope,
- Cutsheets / specs for the new Service Equipment to be installed,
- Filled out Service Planning application form(s),
- Application(s) for Permit(s),
- Necessary Fees.
, then you will be the responsible party for compiling the Service Feeders' Design; and so begins the questions list:
- What is the Calculated Load?
- Will all Parallel Conductors share a single Duct, or will there be Parallel Ducts with Four Feeder Conductors in each?
- Will you use Copper or Aluminum Conductors?
- Do you need to adjust size, due to Voltage Drop issues?
- Is there any requirements from the DBS or Utility for a minimum Conductor size, &/or Conductor material + insulation?
- Were the "Original" Service Entrance Feeders + Ducts installed by an EC or the Utility Dept.?
- Any ideas of the "Original" Load Calcs' figures, which determined the size of the "Original" Feeders?
Out of curiosity, what size Transformer is used (75 KVA - 208Y/120VAC or 175 KVA, 480Y/277VAC), and is the Service Capacity 400 Amps?