Electrical Depth Work

Transcription

1 Electrical Depth Work Introduction With changes in a lighting system in a building come changes in the electrical system. The first part of the electrical work involves the analysis of the affected panelboards and associated lighting circuits. The emergency lighting was also considered here. Once these changes have been made, a study was conducted to be sure the existing system would be sufficient for the new installed system. Conductors and circuit breakers were also resized along with one of the main distribution panels and transformer. Finally, a protective device fault current coordination study was conducted to be sure the electric system was safe under all operating circumstances. Panelboard Information and Power Plans LARGE DINING AREA Area A: Currently running on panelboard B circuits 25 and W T5 fluorescent cove fixtures 2088 VA/120V 17.4 A 24 18W compact fluorescent downlights 456VA/120V 3.8 A 15.4 A B-25: 48 28W T5 fluorescent cove fixtures 1392 W 16 18W compact fluorescent downlights 304W 1696W= 1.7KW B-27: 24 28W T5 fluorescent cove fixtures 696W 8 18W compact fluorescent downlights 152W 848W= 0.8KW 62

2 Area B: Currently running on panelboard D circuits 17, 19, 21, 23 and W metal halide downlights 2256 VA/120V 18.8A 2 39W metal halide downlights 110 VA/120V 0.92 A blue neon 377 VA/120V 3.14 A 39 blue LED fixtures 19.5 VA/120V 0.16 A 1 50W halogen spotlight 50 VA/120V 0.42 A 1 Halogen Balloon 1600 VA/120V 13.3 A D-17: NO LONGER NEEDED FOR LIGHTING A D-19: blue neon 377 W 8 70W metal halide downlights 752 W (1129W) D-17: NO LONGER NEEDED FOR LIGHTING D-23: 16 70W metal halide downlights 1504 W 2 39W metal halide downlights 110 W 1614W= 1.6KW D-25: 1 Halogen Balloon 1600 W 1 50W halogen spotlight 50 W 39 blue LED fixtures 19.5W 1670W=1.7KW Circuit D-19 also runs through the lobby, so fixtures from this area will be placed on this circuit as well. Area C: Currently running on panelboard B circuits 18 and W T5 fluorescent cove fixtures 1914 VA/120V 15.6A 24 18W compact fluorescent downlights 456VA/120V 3.8 A 19.4 A B-18: 44 28W T5 fluorescent cove fixtures 1276W 16 18W compact fluorescent downlights 304W 1580W= 1.6 KW B-19: 22 28W T5 fluorescent cove fixtures 638W 8 18W compact fluorescent downlights 456W 1094W=1.1KW 63

3 Area E,F and G: Currently running on panelboard K circuits 24, 26, 35,39 and 41 and panelboard G circuits 24 and W compact fluorescent downlights 1768 VA/120V 14.7 A 32 64W compact fluorescent downlights 2144VA/120V 17.9 A 6 100W halogen spotlights 600VA/120V 5.0A 153 of white neon 536VA/120V 4.47A 29 28W fluorescent cove fixtures 841VA/120V 7.0A 37 50W halogen pendants 1850VA/120V 15.4A 64.4A K-24: 20 32W compact fluorescent downlights 680 W 43 of white neon 151W 13 50W halogen pendants 650W 1481W=1.5KW (Area E) K-26: 20 64W compact fluorescent downlights 1340W= 1.3KW (Area F) K-35: 6 100W halogen spotlights 600W 69 of white neon 242W 16 50W halogen pendants 800W 1642W=1.6KW (Area F) K-39: 11 64W compact fluorescent downlights 737W 41 of white neon 144W 9 50W halogen pendants 450W 1331W=1.3KW (Area G) K-41: NO LONGER NEEDED FOR LIGHTING G-24: 32 32W compact fluorescent downlights 1088W 29 28W fluorescent cove fixtures 841W 1929W=1.9KW (Area G) G-34: NO LONGER NEEDED FOR LIGHTING 64

4 Area E&F 65

5 Area G 66

6 Area H: Currently running on panelboard K circuits 23, 25, and W T5 fluorescent cove fixtures 725 VA/120V 6.04 A 16 64W compact fluorescent downlights 1072VA/120V 8.93 A 27 32W compact fluorescent downlights 918VA/120V 7.65 A 22.62A K-23: 25 28W T5 fluorescent cove fixtures 725 W 16 64W compact fluorescent downlights 1072W 1797W=1.8KW K-25: 27 32W compact fluorescent downlights 918W=0.9KW 67

7 LOUIE S The lighting for Louie s is currently placed on Panelboard D and uses circuits 8, 10, 12, 14, 16, and W High Bay downlight 288VA/120V= 70W Downlights 1128VA/120V= 39W Downlights 96VA/120V= 32W Uplights 360VA/120V= 2.4 A 9.4 A 0.8 A 3.0 A 15.6 A D-10: 250W High Bay downlight 288W 70W Downlights 1128W 39W Downlights 96W 32W Uplights 360W 1872W=1.9KW D-8: USED FOR LIGHTING IN THE VESTIBULE D-12,14,16,18: NO LONGER NEEDED FOR LIGHTING 68

8 CIRCULATION The lighting for the vestibule is placed on panelboard D circuit W compact fluorescent downlights- 342VA/120V= 2.85 A 42 feet of neon- 147VA/120V= 1.23 A 4.08 A D-8: 12 18W compact fluorescent downlights 342W 42 of neon 147W 489W=0.5W The lighting for the lobby is placed on panelboard D circuit 19 along with some lighting from the dining room W compact fluorescent downlights- 342VA/120V= 2.85 A 1 skydome fixture- 170VA/120V= 1.42 A 4.27 A D-19: Dining Room 1129W 12 18W compact fluorescent downlights 342W 1 skydome fixture 170W 1641W=1.6KW I will place all luminaires on circuit D-19 along with the fixtures in the dining room. The lighting for the corridor is placed on panelboard D circuit 15 and 19, but circuit 19 now has enough loads from the lobby and dining area B. 4 18W compact fluorescent downlights 76VA/120V= 0.63A 5 18W compact fluorescent washlights 95VA/120V= 0.79A 5 32W compact fluorescent downlights 168VA/120V= 1.4A 39-7 of neon 138.5VA/120V 1.15A 3.97A D-15: 4 18W compact fluorescent downlights 76W 5 18W compact fluorescent washlights 95W 5 32W compact fluorescent downlights 168W 39-7 of neon 138.5W 478 W=0.5KW 69

9 70

10 EXTERIOR The lighting for the exterior façade lighting is currently placed on Panelboard B and uses circuit W metal halide downlight 220VA/120V= 1.83A 11 70W metal halide directional uplights 1034VA/120V= 8.62A 8 39W metal halide uplights 440VA/120V= 3.67A 14.12A B-28: 4 39W metal halide downlight 220W 11 70W metal halide directional uplights 1034W 8 39W metal halide uplights 440W 1694W= 1.7KW 71

11 Panelboard Layouts The circuits which have been changed are pink. Panelboard B Panelboard D 72

12 Panelboard G Panelboard K 73

13 Emergency Lighting The current system in the building runs on normal/emergency switching for the purposes of emergency lighting and runs off of a generator. The generator turns on if it notices the normal electric is no longer running, forcing the switch to cross over to emergency power. After considering other options I have decided that this system will also work best with my system. Not only are the spaces very large, but any other type of emergency system would be distracting. Also, battery backup ballasts for the luminaires are not an option since I have already decided to use a daylight control system which uses ballasts specific to the control system. The chart below will show the available normal/emergency circuits, what wattage is offered from removing the existing system, and the fixtures I have decided to add to the system in place of the existing. The circuiting plans follow. Circuit Area Fixtures Wattage Replacements NE3-6 NE4-6 NE3-4 NE4-4 NE4-5 NE2-8 NE2-10 NE2-13 NE2-7 Dining Area A Dining Area B Lobby Dining Area C Corridor 5-3-lamp (F32T8) Semi-Indirect linear pendant 2- decorative pendant (96W each) 1-32W downlight 1- large area source (192W) 2-2'x2' fluorescent troffers (51W each) 4-3-lamp (F32T8) Semi-Indirect linear pendant 5-2'x2' fluorescent troffers (51W each) Vestibule 3-32W downlight Louie's Dining Area H Dining Area E Dining Area F/G Dining Area G 10-42W long compact fluorescent strip fixtures W downlight W downlights (456W) 1-39W downlight 2-70W downlights (243W) 1- skydome 4-32W downlights (302W) 21-18W downlights (399W) 3-32W downlight 3-18W washlight (156W) 5-18W downlights (95W) 1-250W downlight 1-34W downlight (342W) 2-64W downlight 5-32W downlight (299W) 7-32W downlight W downlight (231W) 6-3-lamp (F32T8) Semi-Indirect linear pendant W downlights (536W) 8-32W downlight W downlight (264W) 74

14 Dining Area 75

15 Louie s Circulation 76

16 Control System The daylight control system I have chosen for this project is one that will help reduce the lighting loads during daylit hours by automatically dimming and switching certain zones. The zones will be programmed into the system once the system has been put into place and have been determined in the lighting portion of this report. The entire system is made up of a series of power supplies which can each supply power to 64 ballasts and each need their own circuit on the panelboards. I have also specified daylight sensors which have been located in the lighting portion of this report. This system has not yet hit the market, so very little information is currently available. I am under the impression that this control system can also control other types of lighting, but no information is available to help me determine how many fixtures, which aren t linear fluorescent, can be placed on each power supply. I have not used all of the available lighting circuits from the existing design which leaves a good number of spare circuits. Since the appropriate information is not available I will assume that this system will fit on the current panelboards. The diagram of this system can be found in the appendix within the control system specifications. Analysis of Panelboard and Associated Feeder There have been four panelboards which have been affected by my lighting redesign. The panelboard and associated feeder I will be analyzing is panelboard D since the most changes were made to the circuits on that panel. Load Calculations LIGHTING: The loads for the changed circuits are listed above. Calculations for the existing circuits to remain: D-4: 12-2 x2-3 lamp fluorescent troffer (lamp 17W linear fluorescent- 18 input watts each) 0.54KW 8-2 x4-3 lamp fluorescent troffer (lamp 32W linear fluorescent- 33 input watts each) 0.8 KW 1.5 KW D-6: 8-2 x4-3 lamp fluorescent troffer (lamp 32W linear fluorescent- 33 input watts each) 0.8 KW 1-4 bare fluorescent fixture (lamp 32W linear fluorescent- 33 input watts each) 0.03KW 0.83KW RECEPTACLES: Each duplex circuit requires 180VA. The receptacles were counted from the power plans. FOOD SERVICE: Equipment Type Symbol (Only Electric) Phase Voltage HP (KW) Amps KVA None Refrigerator (1.50) MECHANICAL: Symbol Equipment Type Phase Voltage HP (Watts) Amps KVA None Auto Flush Valve

17 Panelboard Circuits Circuit Number Description Load (KW) 1 Receptacles Refrigerator Receptacles Lights-2nd floor Receptacles Lights-2nd floor Receptacles VESTIBULE LTG Receptacles SPARE Auto Flush Valves SPARE Contactor SPARE CORRIDOR LTG SPARE SPARE SPARE DINING AREA B &LOBBY LTG Receptacles SPARE Receptacles DINING AREA B Receptacles DINING AREA B Receptacles Spare Receptacles Spare Spare Empty - 32 Empty - 33 Empty - 34 Empty - 35 Empty - 36 Empty - 37 Empty - 38 Empty - 39 Empty - 40 Empty - 41 Empty - 42 Empty - 78

18 Connected Load Load Type Load (KW) Demand Factor Connected Load (KW) Lighting Receptacle first 10KVA 6.84 Food Service Mechanical Total Circuit Protection and Conductors Maximum load on any circuit=1.6kw Maximum ampacity per circuit= 1600VA/120V=13.33A A 20 amp breaker which can hold 16A is the minimum breaker size used in practice. All circuits fall under this maximum ampacity and will be protected by this size breaker and use (2) #12 & (1)#12 in ¾ conduit. Panelboard Protection I=VA/( 3(V))= (16450VA) /( 3(208V))= 45.7A This panelboard was originally protected by a 100A breaker. I will keep it at this size because of the fact that the control system was not placed on the panelboards, and there are many spare circuits on this panel where this system could be placed. Additional Design Loads The only design loads that have changed in my system are the lighting loads. Since panel D, which has been already analyzed, is on SPD2, the second main distribution panel in my system, I will select the minimum size for this piece of equipment along with its protective device. In turn, the building s transformer will be sized accordingly. The panelboards which are connected to this distribution panel are B, C, D, F and MP. Panel B: Panel D: Original lighting load: 8.6KW Adjusted lighting load: 9.1 KW Original lighting load: KW Adjusted lighting load: KW Therefore the load change on SPD2 is KVA. The original total connected load on this main distribution panel (the calculations for these loads can be found in Tech2): Demand Load on Load SDP2 (KVA) Lighting Receptacles Mechanical Automatic Transfer Switch 0.00 Kitchen Equipment Miscellaneous Loads Power Assisted Doors 1.00 Stamp Machine

19 Uninterruptible Fire Power Supply Adjusted connected load Protective Device I=VA/( 3(V))= (159,160VA) /( 3(208V))= 441.8A This main distribution panel will be sized for 600A. Feeder Size Since the load on this distribution panel has changed so slightly the existing feeder can still be used: is (4) 600 KCMIL & (1) 4/0 in 4-4 conduit Building Transformer This transformer is also connected to another main distribution panel- SPD1. The lighting loads do not change the total connected loads on that distribution panel either. Since the loads have been changed only the slightest bit, the transformer that was used in the previous design will still be adequate for this design. The transformer was initially rated at 966 KVA, approximately 50% larger than the capacity of the system. 80

20 Section of Electrical System 81

21 Protective Device Coordination Study The path I will address for this study will start at the building transformer, to SPD2, and end at panelboard D. These calculations will prove that my electrical system is safe under all conditions and that a fault will be isolated without disturbing any other part of the system. The exact transformer specifications were not given to me so assumptions were made with regards to the utility system rating (500MVA) and x/r ratio (12%). I have assumed the building s transformer is made by Square D and has an impedance of 4% and x/r rating of 2. Calculations 82

22 Summary of Results of Fault Analysis Point Available Fault Std Breaker Rating Actual Rating A 46,310.6 A 65,000 A Not given B 22,177.5 A 42,000 A 42,000 A C 2,346.8 A 10,000A 10,000A THE SYSTEM IS SAFE! Conclusion The only design loads which have been affected by my redesign are the lighting loads. The necessary equipment has been sized, and through this in-depth study and comparison to the existing system I have proven that the existing system is adequate for my redesign. The fact that the same equipment can be used is a good thing, mostly for monetary reasons. It also proves that the system was initially sized correctly and is safe for operation. 83