E2.02.One Line Diagram.pdf

PDF 193 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 project at the Auraria Higher Education Center in Denver, Colorado. The diagram illustrates the electrical distribution system (MDC2) serving the renovated facility, with a primary focus on the redesign and upgrade of electrical infrastructure to support new mechanical equipment installations across multiple floors and basement levels. The project involves replacing existing panels, transformers, and distribution equipment while maintaining connectivity to the existing electrical grid supplied by Xcel Energy. Key work items include providing new 600-ampere mechanical panels on the south basement, first floor south, and second floor south mechanical rooms; replacing existing transformers with new units of specified capacities (ranging from 30 kVA to 75 kVA); upgrading conduit sizes from 2.5 inches to 3 inches in specified locations; relocating existing panels with associated extensions; and conducting infrared scans and maintenance on existing distribution gear. The electrical design accommodates a total connected load of 848,770 volt-amperes across multiple distribution panels with demand factors applied per National Electrical Code requirements.

The one-line diagram specifies conductor sizing, conduit types, and overcurrent protection settings in accordance with the 2011 National Electrical Code. The system operates at 480-volt three-phase primary service with secondary voltages of 208Y/120 volts three-phase four-wire. All conductors are copper with magnetic conduit systems. The project document includes coordination requirements with the building owner for all equipment shutdowns and specifies that existing circuit configurations must be field-verified during installation. Engineering services were provided by BCER, structural engineering by Martin & Martin, and the project is owned by the Auraria Higher Education Center. The addendum dated February 9, 2015, updates the electrical design specifications for the phased renovation project.

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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
E2.01.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 - MDC2

Node ID

Node Description

Xcel Energy

Utility Xfmr

MDC2

PANEL MPBS

PANEL MPGW

PANEL MP2W

45K-PRIM RGW2/RGW3

45K-SEC RGW2/RGW3

PANEL LBS1

PANEL LGW1

45KVA-PRIM RGW1

45KVA-SEC RGW1

PANEL L2W1

NodeType

Utility

Xfmr

Panel

Xfmr

Panel

Xfmr

Panel

Line Voltage

From

Utility Avail MVA Xfrmr Size

1,500

45.0

Feeder Information

Runs

Size

#500KCMIL

#350KCMIL

#500KCMIL

Length

ConductorType

Conduit Type

Mag.

Sym.RMS Fault Current

33,914

32,612

15,850

10,267

10,091

9,510

2,955

10,574

9,080

8,529

2,924

8,838

Per Unit R Value

0.00860

0.00978

0.04787

0.08659

0.08849

0.10677

1.14344

0.08341

0.08530

0.10548

1.14215

Per Unit jX Value

0.05250

0.05445

0.10328

0.15292

0.15536

0.15683

0.82350

0.14885

0.17945

0.18336

0.85003

X/R Ratio

6.10

5.57

2.16

1.77

1.76

1.47

0.72

1.78

2.10

1.74

0.74

2.09

''MDC2'' LOAD SUMMARY

277/480V, 3P, 4W

Panel

DPS1

MPBS

MPGW

MP2W

RGW2

RGW3(REMOVED)

LGS1

RGS3

RGS2

RGS1

LBS1

RBS1/RBS2

CBLSA/CBLSB

LGW1

RGW1

L2W1

R2W1

C2W1

CGW1

DPS2*

RGC4A/RGC4B

TOTAL CONNECTED VA

DEMAND FACTORS PER NEC

TOTAL DEMAND LOAD (VA)

* DIST PANEL ONLY - NO LOAD EXCEPT FOR SUB PANELS

Sub-Feed Panel

NEC - DERATED DEMAND LOAD IN VA

Lighting

37,774

17,500

1,350

19,212

1,150

95,966

1.25

119,958

Recepts

3,420

19,620

9,720

14,760

3,600

4,860

4,200

13,260

2,520

75,960

NEC 220.44

42,980

Largest Motor

79,444

47,367

84,762

1,130

84,762

1.25

105,953

TOTAL DEMAND LOAD

SPARE CAPACITY

TOTAL

Remaining Motors

47,888

24,930

19,612

4,308

1,600

227,229

1.00

227,229

Equipment

13,400

10,481

8,500

14,530

9,390

24,800

12,550

3,500

97,651

1.00

97,651

Panel(s)

125,000

20,000

70,000

40,000

255,000

1.00

255,000

36%

Kitchen

0.65

1,021

1,600

Total

848,770

R G S

(N)

M P B S

(N) L B S

(N)

P P

R G C A

(R)

R G C B

(R)

L G W

(N)

M P G W (N)

R G W

(N)

T P

T G

R G W

(N)

L W

(N)

M P W (N)

T G

R W

(N)

L G S

(E)

R G S

(E)

R G S

(E)

R G S S A

(E)

R G S S B

(E)

R B L S C

(E)

R B L S B

(E)

R B L S B

(E)

C B L S A

(E)

C B L S B

(E)

R B S

(E)

R B S

(E)

D P S

(E)

R G W

(E)

C W

(E)

C G W

(E)

ELECTRICAL ONE-LINE DIAGRAM - MDC2

(E)SWITCHBOARD "MDC2"

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

50,000AIC

(E)SWITCHBOARD "DPS1"

800A, 208Y/120V, 3PH, 4W

50,000AIC

400/3

400A

400/3

300A

400/3

400A

400/3

400A

45KVA

K-13

45KVA

SPD

600/3

600A

600/3

600A

800/3

225KVA

800/3

(MAIN)

800A

400/3

DIM #1

100/3

DIM #2

100/3

200/3 200/3 200/3 200/3

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

45KVA

200/3

SPD SPD

400/3

75KVA

(R)

100/3 w/90A FUSES (R)

SPD

30KVA

(R)

45KVA(N)

45KVA

45KVA(N)

45KVA

K-13

SPD

45KVA(N)

SPD

Isc=32,612A

Isc=15,850A

Isc=10,267A

Isc=2,955A

Isc=9,510A Isc=2,955A

Isc=9,510A

(E)(4#350KCMIL)3"C

Isc=10,5754A

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

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

Isc=9,080A Isc=8,529A

Isc=2,924A

Isc=8,838A

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

Isc=4,500A (at 5%Z)

W G

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 SOUTH

BASEMENT MECHANICAL ROOM. REPLACE EXISTING (2)2-1/2" 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 FIRST

FLOOR SOUTH MECHANICAL ROOM. REPLACE EXISTING (2)2-1/2" 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 SOUTH MECHANICAL ROOM. REPLACE EXISTING (2)2-1/2" 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 "RGW1"

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

E2.02

ELECTRICAL ONE-LINE

DIAGRAM - MDC2

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.