Page 183 - Urban Construction Project Management

138 Chapter Six
Exhibit 6-19
Utility Company
Utility load letter. Urban City, USA

Re: Urban City Center
150 Main Street – Electric Load Letter
Urban City, USA

Dear Utility Company:

We have been retained to do the design of the electrical systems for the Urban City Center at 150
Main Street.

The owner is planning to construct a 255,000 s.f. office building:
• Basement – storage, mail room - 5,000 sq. ft.
• 25 floors @ 10,000 s.f. - 250,000 sq. ft.
We are herewith submitting the preliminary estimated connected load breakdown for the above-
mentioned project:
Equipment Connected Load Remarks
Lighting 510 KW 2 watts/sq. ft. 255,000
Miscellaneous Power 1020 KW Included 4 w/sq. ft. office
area floors 255,000
Data Center Equipment 512 KW
Kitchen Equipment 775 KW Electrical kitchen
HVAC Load 1784 KW Chillers, cooler tower, pumps
Total Connected Load 4601 KW

3. Water pressure pumps
4. Lighting and outlets at the loading dock at the base of the hoist
5. Lighting and outlets at the floor hoist landings
6. Sidewalk bridge and shed lighting
7. Lighting to be installed on scaffolding
8. Welding, sawing, and special use equipment
9. Use of commissioning elevators
10. Stair lighting
11. Hanging scaffolds and rigs
12. Rigging equipment
13. Security lighting

The voltage, amperage, and power requirements of all construction equipment should
be evaluated to ensure that sufficient power of the proper voltage is available. If high
voltage power is available at the site, at 265/460 volts, 3-phase power, it should be
utilized to the fullest extent possible. This higher voltage allows for more efficient
distribution of electrical power, and minimizes voltage drop in the distribution of
power. Transformers will need to be utilized to step down the power to 120/208 volts,