E2.01.One Line Diagram.pdf

PDF 190 KB Posted Jan 24, 2019

Attached to: AHEC-19915-R - Library Roof PV Solar Array Installation
Solicitation number: RFP GMAA 2019000145 3
Issued by: Denver County, Denver City, Colorado

About this file

Written by GovTribe AI · Mar 13, 2026

This is an electrical one-line diagram for the Auraria Library Renovation—State Phase II project located at 1155 10th Street, Denver, Colorado, prepared for the Auraria Higher Education Center. The diagram illustrates the electrical distribution system (MDC1) designed to support the library renovation, featuring a 1600-ampere, 480-volt/277-volt, three-phase, four-wire switchboard with a 50,000-ampere interrupting capacity serving as the main distribution center. The system includes three dry-type transformers (45 killovolt-amperes, 75 killovolt-amperes, and 112.5 killovolt-amperes) that step down power from 480 volts primary to 208 volts/120 volts secondary, distributing power to multiple panels and equipment throughout the building. The diagram specifies conductor sizes, conduit types, feeder lengths, fault current calculations, and grounding requirements based on the 2011 National Electrical Code, with detailed load summaries indicating total connected demand of approximately 866 kilowatt-amperes across lighting, receptacles, motors, and equipment loads.

The work notes direct contractors to provide new panels to replace existing panels, relocate equipment as required, replace three transformers with new units of specified sizes, upgrade existing two-inch conduits to three-inch conduits, coordinate all shutdowns with the facility owner, inspect and torque existing distribution connections, and perform infrared scans of electrical distribution gear. Engineering design services were provided by BCER (mechanical and electrical engineer) located in Arvada, Colorado, with structural engineering by Martin & Martin in Lakewood, Colorado. The diagram was issued on January 19, 2015, with addendum revisions dated February 9, 2015, indicating an active design and construction planning phase for the electrical infrastructure upgrade.

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File	Type	Posted
AHEC-19915-R_AHEC Library Solar Installation Design Build Lump Sum RFP_FINAL_MOD 2_1-24-19.pdf	PDF	Jan 24, 2019
AHEC-19915-R_ADDENDUM 2_Design Build Library Solar Array_FINAL.pdf	PDF	Jan 24, 2019
E2.02.One Line Diagram.pdf	PDF	Jan 24, 2019

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#842 50(3#10 & 1#10G)3/4"C. (4#6 & 1#8G)1"C.1815 25T1

GROUNDING ELECTRODE CONDUCTOR SIZED PER TABLE 250.66 OF 2011 N.E.C.

EQUIPMENT GROUNDING CONDUCTOR SIZED PER TABLE 250.122 OF 2011 N.E.C.

SUPPLY SIDE BONDING JUMPER SIZED PER 250.102 OF THE 2011 N.E.C.

a.NOTES:

KEY KVA AMPS

(4#500KCMIL & 1#1/0G)3-1/2"C.

208Y/120 VOLT, 3 PHASE, 4W - SECONDARY

(4#3 & 1#8G)1-1/4"C.

(4#1/0 & 1#6G)2"C.

DRY TYPE TRANSFORMER SCHEDULE

(3#1 & 1#6G)1-1/4"C.

(3#6 & 1#10G)1"C.

(3#4 & 1#8G)1"C.

480 VOLT, 3 PHASE - PRIMARY

PFEEDER

AMPS

#1/0

FEEDER S G

(3#2/0 & 1#6G)2"C.112.5T5 135 175

(4#4/0 & 1#2G)3"C.200 225 #2

2[(4#4/0 & 1#1/0G)3"C.]450415 #1/0(3#4/0 & 1#4G)2-1/2"C.150T6 180 225

2[(4#500KCMIL & 1#2/0G)3-1/2"C.]700625 #2/0(3#500KCMIL & 1#3G)3"C.225T7 270 350

3[(4#350KCMIL & 1#3/0G)3-1/2"C.]900831 #3/02[(3#4/0 & 1#2G)2"C.]300T8 360 450

5[(4#400KCMIL & 1#250KCMIL-G)4"C.]16001385 #3/02[(3#500KCMIL & 1#1/0G)3"C.]500T9 600 750

O.C.

PROTECTION

GRD.

ELECTRODE

O.C.

PROTECTION

CONDUCTOR SIZES BASED ON COPPER.d.

FAULT CURRENT SCHEDULE - MDC1

Node ID

Node Description

Xcel Energy

Utility Xfmr

MDC1

PANEL LGN1

45KVA-PRIM RGN1

45KVA-SEC RGN1

PANEL L2N1

45K-PRIM R2N1/CGN1

45K-SEC R2N1/C2N1

PANEL LGE1

PANEL L2E1

75KVA-PRIM RGE1

75KVA-SEC RGE1

PANEL MPBE

PANEL MP2E

PANEL LBE1

112KVA-PRIM RBE1

112KVA-SEC RBE1

NodeType

Utility

Xfmr

Panel

Xfmr

Panel

Xfmr

Panel

Xfmr

Panel

Xfmr

Line Voltage

From

Utility Avail MVA Xfrmr Size

1,500

45.0

75.0

112.5

Feeder Information

Runs

Size

1600A Busduct

#500KCMIL

#350KCMIL

#500KCMIL

#2/0

Length

ConductorType

Conduit Type

Mag.

Non-Mag.

Sym.RMS Fault Current

33,914

33,238

11,429

10,580

3,004

11,173

10,359

2,996

17,102

12,125

15,971

4,036

30,146

23,394

19,042

18,097

4,306

Per Unit R Value

0.00860

0.00995

0.06470

0.08489

1.12155

0.06659

0.08677

1.12344

0.03733

0.05998

0.04774

0.55374

Per Unit jX Value

0.05250

0.05336

0.14399

0.14789

0.81456

0.14711

0.15102

0.81769

0.09868

0.13618

0.10239

0.87039

X/R Ratio

6.10

5.36

2.23

1.74

0.73

2.21

1.74

0.73

2.64

2.27

2.14

1.57

4.23

2.89

2.82

2.41

2.61

''MDC1'' LOAD SUMMARY

277/480V, 3P, 4W

Panel

LBE1

RBE1/RBE2

MPBE

MP2E

LGE1

RGE1

RGE2

L2E1

C2E1

CGE1

R2E1

LGN1

RGN3

LCS

L2N1

R2N1

RGN1

RGN2

C2N1

CGN1

TOTAL CONNECTED VA

DEMAND FACTORS PER NEC

TOTAL DEMAND LOAD (VA)

Sub-Feed Panel

NEC - DERATED DEMAND LOAD IN VA

Lighting

30,000

44,020

20,639

26,221

15,292

1,800

139,719

1.25

174,649

Recepts

40,544

13,680

7,920

10,260

3,060

11,340

10,860

111,884

NEC 220.44

60,942

Largest Motor

28,586

102,213

1,920

102,213

1.25

127,766

TOTAL DEMAND LOAD

SPARE CAPACITY

TOTAL

Remaining Motors

57,029

152,737

1,920

242,742

1.00

242,742

Equipment

10,000

7,500

27,300

8,400

50,500

7,430

8,712

9,000

11,450

6,556

4,200

8,100

1,100

160,248

1.00

160,248

Panel(s)

65,000

18,880

15,000

98,880

1.00

98,880

35%

Kitchen

1.00

1,042

1,600

Total

865,977

L G N

(N)

L N

(N)

R N

(N)

L G E

(N)

R G E

(N)

R G N

(R)

R G N

(N)

T G

R G N

(N)

T G

L B E

(N)

M P B E

(N)

M P E

(N)

L C S

(R)

ELECTRICAL ONE-LINE DIAGRAMS - MDC1

C N

(E)

C G N

(E)

L E

(E) T

C E

(E)

C G E

(E)

R E

(N)

S R G E

(E)

T G

R B E

(E)

R B E

(E)

(E)SWITCHBOARD "MDC1"

1600A, 480Y/277V, 3PH, 4W

50,000AIC

45KVA

K-13

400/3

400A

600/3

600A

400/3

400A

400/3

400A

45KVA

K-13

112.5KVA

(3#1/0, 2#1/0-N & 1#6G)2-1/2"CEXTEND TO

NEW LOCATION

EXTEND TO

NEW LOCATION

(E)(4#500KCMIL)3-1/2"C

(4#500KCMIL & 1#3G)3-1/2"C

PROVIDE NEW (1#3G)

IN EXISTING CONDUIT.

(E)(4#500KCMIL)3-1/2"C

Isc=17,102A

Isc=3,000A (at 5%Z)

Isc=7,000A (at 5%Z)

FOUR WIRE + GROUND

COPPER CONDUCTORS

INSULATION PER SPECIFICATIONS

FEEDER

IDENTIFIER

FEEDER TABLE

THREE WIRE + GROUND

INSULATION PER SPECIFICATIONS

COPPER CONDUCTORS

IDENTIFIER

FEEDER

DEVICE SETTINGS

OVERCURRENT

8[(4#500KCMIL + 1#400KCMILG)3-1/2"C]

7[(4#500KCMIL + 1#350KCMILG)3-1/2"C]

6[(4#500KCMIL + 1#250KCMILG)3-1/2"C]

5[(4#400KCMIL + 1#4/0G)3-1/2"C]

4[(4#350KCMIL + 1#3/0G)3"C]

3[(4#400KCMIL + 1#2/0G)3"C]

2[(4#500KCMIL + 1#1/0G)3-1/2"C]

2[(4#350KCMIL + 1#1G)3"C]

2[(4#250KCMIL + 1#2G)3"C]

(4#500KCMIL + 1#3G)3-1/2"C

(4#350KCMIL + 1#3G)3-1/2"C

(4#350KCMIL + 1#4G)3-1/2"C

(4#250KCMIL + 1#4G)3"C

(4#4/0 + 1#4G)2-1/2"C

(4#3/0 + 1#6G)2-1/2"C

(4#2/0 + 1#6G)2"C

(4#1/0 + 1#6G)2"C

(4#1 + 1#6G)1-1/2"C

(4#2 + 1#8G)1-1/4"C

(4#4 + 1#8G)1"C

(4#6 + 1#10G)1"C

(4#8 + 1#10G)3/4"C

(4#10 + 1#10G)3/4"C

(4#12 + 1#12G)3/4"C

4WG3000

4WG2500

4WG2000

4WG1600

4WG1200

4WG1000

4WG800

4WG600

4WG500

4WG400

4WG350

4WG300

4WG250

4WG225

4WG200

4WG175

4WG150

4WG125

4WG100

4WG70

4WG60

4WG50

4WG40

4WG30

4WG20

8[(3#500KCMIL + 1#400KCMILG)3"C]

7[(3#500KCMIL + 1#350KCMILG)3"C]

6[(3#500KCMIL + 1#250KCMILG)3"C]

5[(3#400KCMIL + 1#4/0G)3-1/2"C]

4[(3#350KCMIL + 1#3/0G)2-1/2"C]

4[(3#250KCMIL + 1#2/0G)2-1/2"C]

2[(3#500KCMIL + 1#1/0G)3"C]

2[(3#350KCMIL + 1#1G)2-1/2"C]

2[(3#250KCMIL + 1#2G)2-1/2"C]

(3#500KCMIL + 1#3G)3"C

(3#350KCMIL + 1#4G)2-1/2"C

(3#250KCMIL + 1#4G)2-1/2"C

(3#4/0 + 1#4G)2"C

(3#3/0 + 1#6G)2"C

(3#2/0 + 1#6G)2"C

(3#1/0 + 1#6G)2"C

(3#1 + 1#6G)1-1/4"C

(3#2 + 1#8G)1-1/4"C

(3#4 + 1#8G)1"C

(3#6 + 1#10G)1"C

(3#8 + 1#10G)3/4"C

(3#10 + 1#10G)3/4"C

(3#12 + 1#12G)3/4"C

3WG3000

3WG2500

3WG2000

3WG1600

3WG1200

3WG1000

3WG800

3WG600

3WG500

3WG400

3WG350

3WG300

3WG250

3WG225

3WG200

3WG175

3WG150

3WG125

3WG100

3WG70

3WG60

3WG50

3WG40

3WG30

3WG20

75KVA

45KVA

(R)

45KVA(N)

1 1

45KVA(N)5

112.5KVA

400/3

Isc=33,238A

Isc=11,429A

Isc=10,580A

Isc=3,004A

Isc=11,173A

Isc=10,359A

Isc=2,996A

(E)(4#500KCMIL)3-1/2"C

Isc=12,125A

Isc=15,971A

Isc=4,036A

Isc=30,146A

Isc=23,394A

(E)(4#500KCMIL)3-1/2"C

Isc=19,042A

Isc=18,097A

Isc=4,306A

NEW JUNCTION BOX

EXTEND TO NEW LOCATION

Isc=3,004A

W G

04WG100

SCALE: NO SCALE

WORK NOTES:

PROVIDE NEW PANEL TO REPLACE EXISTING PANEL. CONNECT ALL EXISTING MAIN PANEL FEEDS AND BRANCH CIRCUITS TO THE SAME CIRCUIT NUMBERS IN THE NEW PANEL. FIELD VERIFY EXISTING CIRCUIT CONFIGURATIONS.

COORDINATE ALL SHUTDOWNS WITH OWNER PRIOR TO START OF WORK.

PROVIDE NEW 600A MECHANICAL PANEL TO FEED NEW MECHANICAL EQUIPMENT IN THE NORTH BASEMENT MECHANICAL ROOM. REPLACE EXISTING (2)2" WITH (2) 3" CONDUITS AND PULL NEW CONDUCTORS TO PANEL.

COORDINATE ALL SHUTDOWNS WITH OWNER PRIOR TO START OF WORK.

PROVIDE NEW 600A MECHANICAL PANEL TO FEED NEW MECHANICAL EQUIPMENT IN THE SECOND FLOOR EAST MECHANICAL ROOM. REPLACE EXISTING (2)2" WITH (2) 3" CONDUITS AND PULL NEW CONDUCTORS TO PANEL.

COORDINATE ALL SHUTDOWNS WITH OWNER PRIOR TO START OF WORK.

RELOCATE EXISTING PANEL AND ALL ASSOCIATED ELECTRICAL EQUIPMENT. EXTEND EXISTING PANEL FEEDS TO NEW LOCATION. ALSO, EXTEND BRANCH CIRCUITS TO THE NEW PANEL LOCATION. FIELD VERIFY EXISTING CIRCUIT

CONFIGURATIONS. COORDINATE ALL SHUTDOWNS WITH OWNER PRIOR TO START OF WORK.

REPLACE EXISTING TRANSFORMER WITH NEW TRANSFORMER OF SIZE INDICATED.

REPLACE EXISTING 30KVA TRAPEZE MOUNTED TRANSFORMER WITH NEW 45KVA TRAPEZE MOUNTED TRANSFORMER. PROVIDE ADDITIONAL STRUCTURAL SUPPORTS IN ORDER TO SUPPORT THE WEIGHT OF THE NEW TRANSFORMER AS REQUIRED. REMOVE THE EXISTING 100A/3P DISCONNECT AND ASSOCIATED CONDUIT AND

WIRING FEEDING EXISTING PANEL "RGN1"("R2N1") AND PROVIDE ALL NEW AS INDICATED.

REPLACE EXISTING 75KVA TRAPEZE MOUNTED TRANSFORMER WITH NEW 75KVA TRAPEZE MOUNTED TRANSFORMER. PROVIDE ADDITIONAL STRUCTURAL SUPPORTS IN ORDER TO SUPPORT THE WEIGHT OF THE NEW TRANSFORMER AS REQUIRED. REMOVE THE EXISTING 400A/3P DISCONNECT AND ASSOCIATED CONDUIT AND WIRING FEEDING EXISTING PANEL(S) "RGE1" AND "RGE2" AND PROVIDE ALL NEW AS INDICATED.

EXISTING DISTRIBUTION GEAR IS TO BE INSPECTED, CLEANED ON THE INTERIOR AND PROVIDED WITH AN INFRARED SCAN TO INSURE PROPER WORKING ORDER. ALL EXISTING CONNECTIONS TO BE TORQUED PER MANUFACTURER'S RECOMMENDATIONS. COORDINATE SHUTDOWN OF GEAR WITH OWNER PRIOR TO PERFORMING

WORK.

OWNERSHIP OF DOCUMENTS:

ALL DRAWINGS, SPECIFICATIONS AND OTHER WORK PRODUCT OF THE ENGINEER FOR THIS PROJECT ARE INSTRUMENTS OF SERVICE FOR THIS PROJECT ONLY AND SHALL REMAIN THE PROPERTY OF THE ENGINEER WHETHER THE PROJECT IS COMPLETED OR NOT. REUSE OF ANY OF THE INSTRUMENTS OF SERVICE OF THE ENGINEER BY THE OWNER OF EXTENSIONS OF THIS PROJECT WITHOUT WRITTEN PERMISSION OF THE ENGINEER SHALL BE AT THE OWNER'S RISK AND THE OWNER AGREES TO DEFEND, INDEMNIFY AND HOLD HARMLESS THE ENGINEER FROM ALL CLAIMS, DAMAGES, AND EXPENSES INCLUDING ATTORNEYS' FEES ARISING OUT OF UNAUTHORIZED REUSE OF THE ENGINEER'S INSTRUMENTS OF SERVICE BY THE OWNER OR BY OTHERS ACTING THROUGH THE OWNER.

PROJECT NO:P

O J E

C T

C 2013 STUDIOTROPE, LLC

OWNER

STRUCTURAL ENGINEER

Martin & Martin 12499 W Colfax Ave

Lakewood, CO 80215

(303) 431-6100

MECHANICAL ENGINEER

BCER

5420 Ward Rd

Arvada, CO 80002

(303) 422-7400

ELECTRICAL ENGINEER

BCER

5420 Ward Rd

Arvada, CO 80002

(303) 422-7400

TECHNOLOGY

SSR Inc.

7995 E PRENTICE AVE #104E

GREENWOOD VILLAGE, CO 80111

(303) 779-1222

ACOUSTICS/AUDIO VISUAL

K2 Audio 4900 Pearl E Cir

Boulder, CO 80301

(303) 865-5500

AURARIA HIGHER

EDUCATION CENTER

1156 7th Street, Development

& Planning Annex

Denver, CO 80204 P:(303) 556-3236 auraria.edu

A u ra ri a

L ib ra r y

R e n o v a ti o n

S ta te P h a s e

I I th

S tr e e t D e n v e r, C

CIVIL

LANDSCAPE ARCHITECT

Mundus Bishop 2601 Blake Street

Denver, CO 80205

(303) 477-5744

BOWMAN - VISION LAND

603 Park Point Drive

Golden, CO 80401

(303) 674-7355

E2.01

ELECTRICAL ONE-LINE

DIAGRAM - MDC1

Date Issued Phase

01.19.2015 ADDENDUM NO. 1

02.09.2015 ADDENDUM NO. 2

File details come from the government source that posted it. Updated Mar 12, 2026.