Attachment_6_-_Existing_Electrical_System_&_New_Electrical_Specs.pdf

Performance Work Statement

Attachment 6: Existing Electrical System and New Trailer Electrical Calculations

1. Pole mounted transformer (PG&E):

a. 75KVA, 3phase w/ neutral.

b. 208/120V

c. 208A = 75 KVA / (208V * 1.73)

Existing South Bldg.

Existing North Bldg.

MSB

CKT # 10 to South Bldg.

CKT # 12 to North Bldg.

2. Main Switch Board (MSB) owned by USACE:

Note: Although it says 480V the MSB doesn’t appear to have a step down transformer so the pole mounted PG&E may be actually supplying 208V, 3phase, 4wire.

a. 480V, 3phase, 400A main, 400A neutral

b. MSB Panel directory as shown on picture:

Gould ITE Panelboard Type P04612 Series 7 120-208V / 3Phase 4Wires / 600 A Date: 10-26-79

c. Therefore the main service is: 120-208V / 3Phase 4Wires / 400A

Actual Physical layout of panel:

Description CB Ckt Ckt CB Description 1: Blank 1 2 70 (2P) 2: Store Room Panel

(CB Position = OFF) 3: Blank 3 4 5: Pole Light & Gate Power 30 (2P) 5 6 70 (2P) 4: Hall Panel

(CB Position = OFF) 7 8 9: Boat Shed 50 9 10 Blank 11: Blank 11 12 Blank 13: Heat Pump (CB Position = OFF)

60 (3P) 13 14 200 (3P) 10: Modular Bldg North Panel 15 16

17 18 Blank 19 20 200 (3P) 12: Modular Bldg. South

Panel Blank 21 22 Blank 23 24

Blank 25 26 150 (3P) 14: West End Panel (CB Position = OFF) Maybe old bldg. service

Blank 27 28 Blank 29 30

3. North Bldg (Double Wide Trailer includes conference room and 2 cubicles):

a. Size is approx.: 24’ x 40’ = 960 sqft

b. HVAC Serial Number: 309C102691059-02

Manufacturer: BARD Model: W36A1-A10XX4XXX Approved Heater Package: EHWA03-A10

(2) SINGLE CIRCUIT: 58A min and 60A Circuit Breaker (CB)

(2) DUAL CIRCUIT: N/A min circuit and N/A CB

From photo NorthHVAC20180426_101144.jpg

-Compressor @ 208V =17.7 RLA

-Outdoor Motor @ 208V = 1.5 FLA

-Indoor Motor @ 208V = 2.2 FLA

-Heater Package EHWA03-A10 @ 208 = 36.2

c. North Bldg. Panelboard (fed by MSB ckt 10 / Main CB is 200A):

Square D: Homeline / NEMA 3R 111221 40265-637-10

Description CB Ckt Ckt CB Description Lights 20 (1P) 1 2 60 (2P) HVAC Receptacles 20 (2P) 3 4

5 6 30 (2P) HVAC

Receptacles 20 (2P) 7 8 9 10 20 (1P) Light Pole Sign & Water Heater 20 (2P) 11 12 Blank 13 14 Blank Outside Receptacle 20 (1P) 15 16 Blank Blank 17 18 Blank Blank 19 20 Blank Blank 21 22 Blank Blank 23 24 Blank

Blank 25 26 Blank Blank 27 28 Blank Blank 29 30 Blank

4. South Bldg (Triple Wide Trailer includes 10 cubicles):

a. Size is approx.: 60’ X 35.25’ = 2115 square ft.

b. HVAC Serial Number: 324A112769572-02

Manufacturer: BARD Model: W50H1-A20EX4XXX Approved Heater Package: EHWH04-A20 (20/15 KW, FLA: 83. 2/72. 1) Outdoor Motor: 240/208 VAC / 60HZ / 1Phase / “1/3HP” / 2.5FLA

(2) SINGLE CIRCUIT: 111A min and 125A Circuit Breaker (CB)

(2) DUAL CIRCUIT: 59/52 min circuit and 60/60 CB

From photo SouthHVAC20180426_101620.jpg

-Compressor @ 208V =25.3 RLA

-Outdoor Motor @ 208V = 2.5 FLA

-Indoor Motor @ 208V = 3.3 FLA

-Heater Package EHWA04-A20 @ 208 = 72.1

c. South Bldg. Panelboard (fed by MSB ckt 12 / Main CB is 200A):

Square D: Homeline HOMC20UC Series S01 / NEMA 1 111512 40265-628-05

Description CB Ckt Ckt CB Description Lights 20 (1P) 1 2 60 (2P) HVAC Receptacles 20 (2P) 3 4

5 6 60 (2P) HVAC

GFCI Receptacles 20 (2P) 7 8 9 10 20 (1P) Sign Exterior GFCI Recpt 20 (1P) 11 12 20 (1P) Water Heater 20 (2P) 13 14 20 (1P) Duct Detector 15 16 20 (1/2P) Telecom BB

Copiers Cubicle 20

(1/2P) 17 18 20 (1/2P) Telecom BB

Copiers

Cubicle 20 (1/2P)

19 20 20 (1/2P) Cubicle

Bay Alarm – for fire alarm

5. Boat House:

2 receptacles Approx. 1750 sf No HVAC.