11.6.1 Electric

11.6.1.1 Overhead Transmission Lines

provide underground utilities

Unsightly overhead utilities should be relocated underground wherever possible to reduce negative visual impacts and reduce maintenance and repair requirements. Underground utilities are also desirable for protection from terrorist or other enemy attack.

Power distribution lines should also be located underground to minimize negative visual impact, reduce maintenance, and for protection from terrorist or other enemy attack.

If for some reason overhead lines are necessary written permission from DPW operation, Division Utilities Section needs to be obtained

11.6.1.2 Electrical Frequently Asked Questions (FAQ)

The following is a synopsis of frequently asked questions and also areas that are prone to discrepancies during design reviews.

1. CONDUCTORS. All interior wiring shall be copper. ROMEX and MC cable are by permission only. (STANDARDS)

2. UNDERGROUND PVC CONDUIT. Install electrical underground to the maximum extent possible. Conductors shall be buried in schedule 40 PVC with the exception of schedule 80 when burying under roads or heavy traffic areas. Concrete encasement is an option of the designer.

3. LIGHTING.

a. Energy-efficient lighting guidelines:

(1) Light levels: 30 fc in administrative areas; 10 fc in hallways.

(2) Lighting power densities shall not exceed 1.5 W/sf, with goal of less than 1 Wlsf.

(3) Design lighting with separate on-off switching for each zone within a space.

(4) Install occupancy sensors in hallway, latrines, classrooms, and meeting rooms.

(5) Take advantage of daylighting potential.

(6) Where daylighting is used, provide photosensors for electric lighting control. See Appendix D for more information.

b. Electronic ballasts specifications:

1) UL listed Class P.

2) Sound rated A.

3) Total harmonic distortion greater than or equal to IO%, third harmonic distortion less than 6%.

(4) Power factor must be greater than or equal to 95%.

(5) Ballast factor must be greater than or equal to 0.88.

(6) Lamp current crest factor less than or equal to 1.7.

(7) Flicker 5% or less with any lamp suitable for ballast.

(8) Minimum 5 year warranty.

c. Fluorescent lamp specifications:

(1) In general, lamps shall be 265 mA "t-8" rapid start type as follows:

(a) 2' lamps shall be 17 watt F17T8.

(b) 3' lamps shall be 25 watt F25T8.

(c) 4' lamps shall be 32 watt F32T8.

(d) 5' lamps shall be 40 watt F4OT8.

(e) 1'MOL U-Iamps shall be 16 watt FB16TS.

(f) 1.5'MOL U-Iamps shall be 24 watt FB24T8.

(g) 2'MOL U-Iamps shall be 31 watt FB31 TS.

(2) Color: Lamps shall be 3500 Kelvin correlated temperature.

(3) Color rendering index: Lamps shall have a minimum CRI of 80 through the use of rare earth phosphor coatings.

d. Compact Fluorescent Lamp/Ballast Specifications:

(1) Color rendering index: Larnps shall have a rninirnurn CRI of 80 through the use of rare earth phosphor coatings.

(2) Color: Lamps shall be of 2700, 3000, 3500, or 5000 Kelvin correlated temperature.

(3) Lamp efficacy must be at least 50 lumens/waft.

(4) Ballast must be of High Power Factor (HPF) type, capable of increasing power factor to 90%.

e. Occupancy sensor specifications:

(1) Ceiling mounted occupancy sensors.

(2) Under cover switch with delay of 30 seconds to 15 minutes.

(3) Detector must be of passive infrared (PIR), ultrasonic, or a combination of both.

(4) Ultrasonic and infrared devices must be equipped with a sensitivity adjustment.

(5) Sensor must have positive detection device, LED or equal.

(6) 5 year warranty.

f. Bulbs kept in stock at Fort Carson:

(1) Phillips

F34T12/CW/RS/EW/ALTO
F32T8/YL741/ALTO
60W
FB32T8/TL741/6 ALTO
FB34/CW/6/EW ALTO
FB34/CW/3/EW
F15T12CW
F17T8/TL735/ALTO
24W PL-L/4P
PL-L18W/835/4P
40G25/W
PL-C 15mm/28W/27
F15T8/CW/ALTO
PL-S 9W/827/2P
PL-S 13W/827/2P
PL-C 13W/835/2P
PL-C 13W/835/4P
PL-C 13W/841/29
PL-C/827/4P
PL-C 18W835/2P
PL-C 26W835/2P
F30T12/CW/RS/ALTO
SLS 25 ALTO

(2) Sylvania

FBO 31/835

(3) GE

F25T8-SP35-ECO

4. FIRE ALARM SYSTEMS. There is a post wide fire alarm system to which any new work must be compatible with. The fire alarm control panels are Thorn and the transmitter and antenna are Monaco BTXM (G.H. Harlow is being phased out). See the Fire Department Section for more information.

a. Fire alarm and detection systems that will use 25 devices or more shall be an addressable system.

b. Exit signs shall be red LED type.

5. EXTERIOR ELECTRIC. Primary voltage at Fort Carson is 12,470/7200V. Overhead to underground transitions shall adhere to attached standards. Where are the standards?)

6. CABLE STANDARD SPECIFICATIONS. (See Attached Specification). 16120 (need to get copy)

7. EXTERIOR LIGHTING. Shall have photocell time lock with hands off auto.

8. All new exterior electric shall be installed underground only.

9. New overhead electric shall be installed by permission only.

10. Use pad mounted transformers with bayonet fusing loop feed.

11. Use load break material only.

12. All exterior lighting shall have time clocks with overriding photocell with hand off auto control.

13. All primary underground conductors shall meet Fort Carson cable standards, type (EPR) with concentric neutral.

14. All work performed on or around a primary electrical system will require a daily hot line clearance (hot line hold order) requested 24 hours before any work is to be accomplished from the Exterior Electric Shop, 526-6548, and must be cleared daily.

15. Underground electric shall be buried at the depth of 24" when encased in concrete and 42" when direct bury.

11.6.1.3 Substations and Transformers

screen transformers from view

Substations and transformers should be designed and located to minimize their visual impact and be compatible with the character of their setting. Substations are best located in industrial use areas rather than in major public circulation areas. They should be screened from public view by using plant material, berms, and walls.