COSC 326: ENVIRONMENTAL CONTROL SYSTEMS II
FALL 2007
Assignment #4: Design of electrical system (ES)
Due:
November 27
General
1. Use the same building for which you have designed the water supply, drainage, and electrical systems
2. Use only the spreadsheet program for electrical calculations uploaded on the instructor’s web page this
semester.
Selected project information
3. Building area in sq. ft.
4. Water heater capacity in gallons
5. Wattage of lamps used for lighting (indicate watts per lamp including ballast)
6. Number of lamps used per luminaire
Electrical plan (separate plans required for light and power circuits)
7. Complete building plan(s) showing power circuits
8. Complete building plan(s) showing light circuits
9. Indicate room names
10. Locate panels
11. Locate meter
12. Locate main disconnect
13. Key or legend explaining symbols used in drawings
14. Show home run
 AWG
 Number of conductors (a short tick for each neutral and a long tick for each phase conductor)
 Circuit no.
 Panel ID
15. Show receptacles (convenience outlets) and circuit lines on power circuit plan
 Distance between two adjacent receptacles should not be more than 10 ft. (10’ oc)
 For office rooms, use one receptacle for every 40 sft. for first 400 sft.
 For office rooms larger than 400 sft. use one receptacle for every 100 sft. beyond the initial 400 sft.
 For bathrooms, use at least two receptacles near the lavatories
 GFCI for bathroom, countertop within 6’ of a sink, and exterior receptacles
 Kitchen countertop shall have at least two 20 A small appliances circuit
 Follow 4’ oc rule for countertop small appliances duplex convenience outlet (i.e. receptacles)
 Limit duplex convenience outlets to 4 per 20 A circuit for small appliances
 Limit duplex convenience outlets to 6 per 20 A circuit for commercial use
16. Show light fixtures and circuit lines on light circuit plan
 Limit actual lighting loads to 1536 W per 20 A circuit
17. Notes
 Indicate mounting height of switches
 Indicate mounting height of receptacles
 Indicate wattage of each type of luminaire (i.e. fixture) (include ballast wattage, if any)
 Type of convenience outlets (i.e. receptacles): use 3 prong, grounded type
Luminaire and convenience outlet rating
18. General description of the apparatus
19. Voltage rating (V)
20. Current rating (A)
21. Power rating (W)
22. Phase (single or three)
Equipment schedule
23. General description of the equipment
24. Voltage rating (in Volts)
25. Current rating (in Amperes)
26. Power rating (in Watts)
27. Circuit #
28. Conductor size (AWG)
29. Termination method
30. Phase (single or three)
Panel (power panel) and sub-panel (light panel) schedule
31. Panel ID
32. Circuit #
33. Circuit breaker rating (A) (including CB’s for feeder circuits)
34. Conductor size (AWG)
35. Conductor type (i.e. conductor material)
36. Insulation type
37. General use (i.e. purpose for which the conductor is installed)
38. Bus loads (in Watts) for all poles (A, B, C)
39. Spare circuits*
40. Spaces*
41. Total load of the panels in Watts (W)
42. Balance both panel and sub-panel loads
43. Total load of the panels in ampere (A)
44. Conductor size (AWG or MCM) considering the actual total panel load (A) (MCM = KCMIL)
Service entry data
45. Nominal voltage
46. Nominal service size (A)
47. Actual conductor size considering nominal service load (AWG or MCM)
48. Quantity of conductors
49. Conduit material
50. Conduit size in inches
Graphics
51. Visual effect
52. Line quality
53. Line weight
54. Lettering
Grading policy
o One quarter of a point (0.25) will be deducted for every incorrect response or omission, including repetitive
incorrect responses or omission (e.g. If the same incorrect value of electrical load is shown for, say, 6
different spaces, a deduction of 0.25x6=1.5 will be made for the item.)
o Non-compliance with items #1 or #2 will result in a deduction of 10 points
o Omission of feeder circuit information on the power panel (items # 33, 34, 37, and 38) will result in a
deduction of 2 points
o Non-submission of electrical drawings will result in a deduction of 7.5 points.
*
Spares + spaces should be 50% of active poles. Usually half the number is used as spares, the other half as
spaces. But you may use all of it either as spares or spaces, if you want to.