A06_NIFC_RFIMS_Infrastructure_Removal_-_Att_4_Existing_One-line.pdf
PDF 51 KB Posted
- Attached to
- NIFC RFIMS INFRASTRUCTURE DEMO Federal contract opportunity
- Solicitation number
- 140L3726R0007
About this file
This document is a One-Line Diagram for electrical infrastructure prepared for the NIFC RFIMS Infrastructure Demo project dated February 11, 2026. The diagram illustrates the existing electrical service configuration and required modifications, with an existing 277/480V, three-phase, 500kVA pad-mount transformer serving as the primary power source, featuring a maximum symmetrical RMS fault current of 37,590 amps at the transformer and 20,366 amps at the service entrance (DISC1).
The contractor is required to furnish and install a 30kVA, 480V single-phase to 120/240V single-phase transformer (T1) with downstream distribution via two 100-amp, 120/240V service entrance disconnects (DISC1 and DISC2) rated with 80-amp and 100-amp fuses respectively. Specific installation requirements include: providing 3/4-inch conduit with one CAT6 cable to the main building; installing a meter in a NEMA 3R enclosure; and providing a 100-amp 120/240V receptacle. All conduit and copper conductors must be sized per National Electrical Code requirements, with calculations provided for the service, panel, and equipment feeders. Contractors may substitute compressed aluminum conductors if corresponding adjustments to conduit and conductor sizes and arc-flash calculations are made. Additional requirements include engraved labels on all electrical equipment displaying available fault current values, and a coordination study with performance testing of the ground fault protection system per NEC 230.95 standards.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| B09_Looking_Southeast_at_RFIMS_pad_area_0001.pdf | ||
| B09_Looking_East_at_RFIMS_pad_area_0001.pdf | ||
| Sol_140L3726R0007_Amd_0001.pdf | ||
| B09_Looking_Northeast_at_RFIMS_pad_area_0001.pdf | ||
| B09_Looking_Southwest_at_RFIMS_pad_area_0001.pdf | ||
| B09_Looking_North_at_RFIMS_pad_area_0001.pdf | ||
| A04_NIFC_RFIMS_Removal_-_Work_Statement.pdf | ||
| A06_NIFC_RFIMS_Removal_-_Att_2_Infrastructure_Plan.pdf | ||
| B03_Wage_Determination_ID20260104_05-18-2026.pdf | ||
| Sol_140L3726R0007.pdf | ||
| A06_NIFC_RFIMS_Removal_-_Att_1_Campus_Map.pdf | ||
| A06_NIFC_RFIMS_Infrastructure_Removal_-_Att_3_Existing_concrete_pad_details.pdf | ||
| B08_NIFC_RFIMS_Removal_-_Bid_Schedule.pdf |
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Text version
ONE-LINE DIAGRAM
NTS
N
EXISTING 277/480V, 3Ø,
500KVA PAD MOUNT
TRANSFORMER
37,590
MAXIMUM SYMMETRICAL RMS
FAULT CURRENT
(TYPICAL OF SYMBOL)
20,366
EXISTING UNDERGROUND
PRIMARY BY IDAHO POWER
T1
30KVA
480V,1Ø - 120/240V, 1Ø
1. PROVIDE 3/4" CONDUIT WITH (1) CAT6 CABLE TO MAIN BUILDING.
2. PROVIDE METER IN NEMA 3R ENCLOSURE.
3. 100 AMP 120/240V RECEPTACLE
A. CONDUIT, CONDUCTORS AND AIC CALCULATIONS FOR ALL
SERVICE, PANEL AND EQUIPMENT FEEDERS INDICATED ON THE
ONE-LINE HAVE BEEN SIZED BASED ON COPPER. THE
CONTRACTOR MAY USE COMPRESSED ALUMINUM
CONDUCTORS FOR THESE FEEDERS PROVIDING THE CONDUIT,
CONDUCTOR SIZES AND AIC CALCULATIONS ARE ADJUSTED AS
REQUIRED TO MEET ALL NATIONAL ELECTRICAL CODE
REQUIREMENTS.
B. FURNISH AND INSTALL ENGRAVED LABEL ON THE FRONT OF
ALL ELECTRICAL EQUIPMENT NOTING THE AVAILABLE FAULT
CURRENT VALUE SHOWN.
C. A COORDINATION STUDY SHALL BE PERFORMED ON THE
GROUND FAULT PROTECTION SYSTEM AND THE GROUND FAULT
PROTECTION SYSTEM SHALL BE PERFORMANCE TESTED TO
VERIFY PROPER OPERATION AS REQUIRED BY NEC 230.95 AT A
MINIMUM. REFER TO SPECIFICATIONS FOR ADDITIONAL STUDY
AND TESTING REQUIREMENTS.
GROUND
PER NEC
GENERAL NOTES:
KEYED NOTES:
DISC1
100/2/3R
SERVICE ENTRANCE RATED
W/ 80AMP FUSES
# SYMBOL USED FOR NOTE CALLOUT.
GROUND
PER NEC
1"C-3#3Cu
F
1-1/2"C-3#1Cu, 1#6Cu
F 14,628
DISC2
100/2/3R
W/ 100AMP FUSES
1-1/2"C-3#1Cu,1#6Cu
1-1/2"C-3#1Cu,1#6Cu
1 2
1-1/2"C-3#1Cu,1#6Cu
PRIMARY
15,736
Shelby Stuart Typewritten Text NIFC RFIMS Infrastructure Demo ATT-4 - Existing One Line Diagram February 11, 2026
File details come from the government source that posted it. Updated .