Chris Rush Lighting / Electrical Primary Consultant: Dr. Mistrick

North Hills Junior High School 55 Rochester Road, Pittsburgh, PA 15229

10/27/04

Electrical Systems Existing Conditions and Building Load Summary Report

Executive Summary: The two main purposes of this report are to provide an overview of the system as a whole, and to conduct basic load calculations to verify the drawings and equipment selection. The summary includes the written description, as well as lists of the lighting and mechanical loads. In calculating the demand load for the building, I determined that the sizing of the main distribution panel is sufficient, even without the spare fused disconnect switch. After applying the proper demand load multipliers and a 1.25 design factor, I found that 2500 amperes would be sufficient. The actual size of the main distribution panel overcurrent protection totals to 3425A without including the spare 800A switch.

Page 1 of 9 Electrical System Description: The North Hills Junior High School utilizes a radial distribution system. A single service entrance from the utility transformer feed the main distribution panel, which in turn feeds transformers and secondary distribution panels. The building side of the utility transformer is Y connected. All transformers within the building’s electrical system have a ∆-primary / Y-secondary configuration. With several transformers within the building, utilization voltages include 480/277V and 208/120V. Most of the lighting loads run on 277V except for some incandescent fixtures, which run on 120V. Most mechanical equipment runs on 120V, except for the larger equipment which is 480V (3Φ) and a handful of 208V. Kitchen equipment and other various equipment throughout the building is mostly a mix of 120V and 208V.

Emergency power is supplied by a 100 KW natural gas generator. An automatic transfer switch connects the emergency generator to the emergency distribution panels. Emergency lighting is connected to panel NEHE and some receptacles are connected to panel NELEE. These panels both service normal and emergency loads. Panel HEM is only operational under emergency power and services several critical exit signs that are connected to both panels NEHE and HEM.

The main lug only main distribution panel houses six fused disconnect switches. Five of these are 800A/3Φ (one of these is spare) and the sixth is 225A/3Φ. The 225A fused switch connects through the automatic transfer switch to the emergency panels NEHE and NELEE. Of the four active 800A fused switches, three serve 480/277V panels and the fourth connects directly to a transformer. All other distribution panels contain molded case circuit breakers for overcurrent protection.

The pad mount utility company transformer is located in the rear of the building, outside of the kitchen. The main distribution panel is located in an electrical closet in the kitchen area, near the utility transformer. The emergency power distribution system, including generator, transformer, and distribution panels, is located in the ground floor boiler room, near the kitchen. The existing motor control center, which remains, is also located in the boiler room. Other transformers and panels are located throughout the three floors of the building.

Typical lighting systems use 32W T8 lamps throughout the building with 277V ballasts. Further ballast information is included in Table 1. All other ballasted lamps also use 277 volts, including metal halide, high pressure sodium, and LED exit signs. The gymnasium lights are 400W metal halide and the exterior lights are 400W and 150W high pressure sodium. Halogen lamps at 120V are used primarily in the auditorium where they must be connected to a dimming panel.

No power factor correction was included in the North Hills Junior High electrical system. There are no major inductive loads to necessitate capacitor banks. All electronic ballasts are specified as high power factor, further eliminating the need for power factor correction.

Page 2 of 9 There were no critical design considerations, beyond the necessary safety precautions regarding emergency lighting. Very few non-lighting loads are connected to emergency power. Because of the non-critical nature of the loads, there are also no UPS systems used in the building. Voltage drop was most likely a consideration when choosing 277V lighting systems. Because the building is very long and narrow, this higher voltage allows for fairly long branch circuits without concern over voltage drop.

Table 1. Primary Lamp and Ballast Information Lamp Ballast W V A P.F. VA (2) F32T8 Advance VIC-2S32 64 277 0.23 0.99 65 (2) CFQ26 Advance ICF-2S26-XX-XX 51 277 0.19 0.99 53 100W MH Advance 71A5383 128 277 0.5 0.92 139 400W MH Advance 71A6031 458 277 1.70 0.97 471 70W HPS Advance 71A7988 95 277 0.4 0.86 111 150W HPS Advance 71A8188 190 277 0.7 0.98 194 400W HPS Advance 71A8433 457 277 1.70 0.97 471 250W Quartz Halogen Mini-Can 250 120 2.08 1 250 500W Quartz Halogen Mini-Can 500 120 4.17 1 500

Table 2. NEC Lighting Load Calculation Occupancy Area (ft2) VA VA / ft2 NEC VA / ft2 NEC VA VA used School 174040 223911 1.29 3 522120 522120 Auditorium 8320 30850 3.71 1 8320 30850 Circulation 35980 52130 1.45 0.5 17990 52130 Total Lighting kVA = 605.1 Lighting kVA x 1.25 continuous load factor = 756.4

The following tables show calculations of the NEC design load for the North Hills Junior High School. For equipment rated in horsepower, the full load current was obtained from tables 430.148 and 430.150 in the 2002 NEC Code. Some loads were not rated in the equipment schedules. When possible, unknown loads were conservatively estimated. In some cases this was not possible, including two water heaters and four other mechanical devices which do no appear in the equipment schedule.

Page 3 of 9 Table 3. Mechanical Equipment Summary and Load Calculation Label Qty Type V Φ HP KW FLA kVA AHU1 1 Air Handling Unit 480 3 23 31 28.53 AHU2 1 Air Handling Unit 480 3 20 27 22.45 CH1 4 Cabinet Heater 120 1 0.07 2.8 1.34 CH2 2 Cabinet Heater 120 1 0.1 3.3 0.79 CH3 4 Cabinet Heater 120 1 0.16 4.4 2.11 CH4 3 Cabinet Heater 120 1 0.16 4.4 1.58 CH5 9 Cabinet Heater 120 1 0.1 3.3 3.56 CU1 2 Condensing Unit 480 3 6 12.00 CU2 1 Condensing Unit 480 3 3.7 3.70 CU3 1 Condensing Unit 480 3 6 6.00 CU4 1 Condensing Unit 480 3 6 6.00 CU5 1 Condensing Unit 208 1 2.4 2.40 CU6 1 Condensing Unit 208 1 2.4 2.40 CU7 1 Condensing Unit 480 3 6 6.00 CU8 1 Condensing Unit 480 3 6 6.00 CU9 1 Condensing Unit 208 1 2.4 2.40 CU10 1 Condensing Unit 480 3 3.74 3.74 CU11 1 Condensing Unit 480 3 3.74 3.74 CU12 2 Condensing Unit 480 3 6 12.00 DC1 1 Dust Collection System 480 3 10 14 11.64 EC1 2 Electric Heating Coil 480 3 20 40.00 ECH-A 1 Existing Cabinet Heater 120 1 0.033 2.2 0.26 ECH-B 1 Existing Cabinet Heater 120 1 0.033 2.2 0.26 ECH-C 1 Existing Cabinet Heater 120 1 0.017 1.9 0.23 ECH-D 1 Existing Cabinet Heater 120 1 0.125 3.7 0.44 ECH-E 1 Existing Cabinet Heater 120 1 0.033 2.2 0.26 ECH-F 1 Existing Cabinet Heater 120 1 0.033 2.2 0.26 EF1 1 Exhaust Fan 480 3 0.25 0.6 0.50 EF2 1 Exhaust Fan 480 3 1 2.1 1.75 EF3 1 Exhaust Fan 120 1 0.5 9.8 1.18 EF4 1 Exhaust Fan 120 1 0.333 7.2 0.86 EF5 1 Exhaust Fan 120 1 0.333 7.2 0.86 EF6 1 Exhaust Fan 120 1 0.333 7.2 0.86 EF7 2 Exhaust Fan 120 1 0.083 3 0.72 EF8 1 Exhaust Fan 480 3 1.5 3 2.49 EF9 1 Exhaust Fan 480 3 5 7.6 6.32 EF10 2 Exhaust Fan 480 3 5 7.6 12.64 EF11 1 Exhaust Fan 120 1 0.1 3.3 0.40 EF12 1 Exhaust Fan 120 1 0.05 2.4 0.29 EF13 1 Exhaust Fan 120 1 0.25 5.8 0.70 EF14 1 Exhaust Fan 120 1 0.04 2.3 0.27 EF15 1 Exhaust Fan 120 1 0.25 5.8 0.70 EF16 1 Exhaust Fan 480 3 0.05 0.2 0.17 EF17 1 Exhaust Fan 120 1 0.083 3 0.36 EF18 2 Exhaust Fan 120 1 0.5 9.8 2.35 EF19 1 Exhaust Fan 480 3 1 2.1 1.75 EF20 4 Exhaust Fan 120 1 0.03 0.2 0.08 EP1 2 Electrostatic Precipitator 115 1 0.5 9.8 2.25

Page 4 of 9 ESCA 4 Existing Self Contained A/C 208 1 3.4 2.83 ESCB 1 Existing Self Contained A/C 208 1 4.5 0.94 ESCC 3 Existing Self Contained A/C 208 1 6.8 4.24 ESCD 3 Existing Self Contained A/C 208 1 8 4.99 FC1 4 Fan Coil Unit 115 1 0.13 0.52 FC2 1 Fan Coil Unit 115 1 0.29 0.29 FC4 1 Fan Coil Unit 115 1 0.095 0.10 FC5 2 Fan Coil Unit 115 1 0.12 0.24 FC6 1 Fan Coil Unit 115 1 0.095 0.10 MUA1 1 Make-Up Air Handling Unit 480 3 5 7.6 6.32 P1 1 Pump 480 3 30 40 33.26 P2 1 Pump 480 3 30 40 33.26 RP1 1 Recirculation Pump 480 3 30 40 33.26 RP2 1 Recirculation Pump 480 3 30 40 33.26 RTU1 1 Packaged Roof Top Unit 480 3 35 46 38.24 SC1 4 Self Contained A/C Unit 208 1 3.4 2.83 SF1 2 Supply Fan 480 3 20 27 44.89 SF2 2 Supply Fan 480 3 0.75 1.6 2.66 UH1 3 Unit Heater 120 1 0.04 2.3 0.82 UH2 2 Unit Heater 120 1 0.05 2.4 0.59 UH3 2 Unit Heater 120 1 0.05 2.4 0.59 UV1 10 Unit Ventilator 120 1 0.125 3.7 4.44 UV2 7 Unit Ventilator 120 1 0.125 3.7 3.11 UV3 2 Unit Ventilator 120 1 0.5 9.8 2.35 UV4 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV5 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV6 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV7 23 Unit Ventilator 120 1 0.125 3.7 10.21 UV8 17 Unit Ventilator 120 1 0.125 3.7 7.55 UV9 2 Unit Ventilator 120 1 0.25 5.8 1.39 UV10 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV11 2 Unit Ventilator 120 1 0.25 5.8 1.39 UV12 2 Unit Ventilator 120 1 0.5 9.8 2.35 UV13 7 Unit Ventilator 120 1 0.5 9.8 8.23 UV14 3 Unit Ventilator 120 1 0.125 3.7 1.33 UV15 5 Unit Ventilator 120 1 0.125 3.7 2.22 UV16 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV17 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV18 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV19 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV20 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV21 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV22 2 Unit Ventilator 120 1 0.125 3.7 0.89 UV23 2 Unit Ventilator 120 1 0.125 3.7 0.89 UV24 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV25 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV26 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV27 1 Unit Ventilator 120 1 0.5 9.8 1.18 UV28 1 Unit Ventilator 120 1 0.125 3.7 0.44 Total kVA for mechanical equipment = 525.05

Page 5 of 9 Table 4. Kitchen Equipment Summary and Load Calculations Item Qty Description V Φ kW HP I (A) kVA Kitchen HVAC equipment 23 1 ventilator 120 1 1.4 1.40 24 1 fire suppression sys. 120 1 1.4 1.40 30 1 ventilator 120 1 1.4 1.40 1A 1 blower coil 120 1 6.3 0.76 1B 1 condensing unit 208 3 2 7.5 2.70 2A 1 blower coil 208 1 3.3 0.69 2A 1 2A continued 208 1 3 3.00 2B 1 condensing unit 208 3 2 7.5 2.70 Total kitchen HVAC equipment kVA = 14.05

Assorted kitchen equipment 1 1 walk-in refrigerator 120 1 1.4 1.40 2 1 walk in freezer 120 1 2 2.00 13 2 prep. table with sinks 120 1 1.4 2.80 18 1 food processor 120 1 0.5 9.8 1.18 20 1 work table 120 1 1.4 1.40 25 2 convection oven 120 1 0.3333 7.2 1.73 28 1 trunnion kettle 120 1 2 0.24 35 1 work table with sink 120 1 1.4 1.40 36 1 booster heater 480 3 17.2 17.20 45 1 hot food holding unit 120 1 1.2 1.20 46 1 work counter with sink 120 1 1.4 1.40 47 3 refrigerator 120 1 12.9 4.64 49 1 work counter with sink 120 1 1.4 1.40 50 11 microwave oven 120 1 2 22.00 51 1 conveyor toaster 208 1 3.8 3.80 52 1 refrigerator 120 1 10.2 1.22 56 1 serving counter 208 3 13.2 13.20 57 1 hot/cold unit 120 1 4 4.00 58 1 hot/cold unit 120 1 3 3.00 59 5 cash register (NIC) 120 1 1.4 7.00 60 1 milk cabinet 120 1 0.25 5.8 0.70 63 1 serving counter 208 3 9 9.00 64 1 hot/cold unit 120 1 3 3.00 65 2 milk cabinet 120 1 0.2 4.96 1.19 70 1 refrigerator 120 1 9.6 1.15 72 1 ice cream cab. (NIC) 120 1 0.3333 7.2 0.86 73 1 refrigerator 120 1 1.3 0.16 74 3 snack counter 120 1 1.4 4.20 80 1 hot food hld. unit 120 1 7.5 0.90 81 1 hot food hld. unit 120 1 14.2 1.70 83 1 cold food serving ctr. 120 1 1.4 1.40 85 1 coffee maker 120 1 1.8 1.80 14A 1 disposer control ctr. 208 3 1.5 6.6 2.38 56A 1 serving counter 208 3 15.2 15.20 89A 1 disposer control ctr. 208 3 1.5 6.6 2.38 XR12 1 mixer (20 quart) 120 1 0.3333 7.2 0.86

Page 6 of 9 XR16 1 slicer 120 1 0.5 9.8 1.18 XR31 2 convection oven 120 1 5.3 1.27 XR33 2 convection oven 120 1 5 1.20 XR34 1 mixer (60 quart) 208 3 1 4.6 1.66 XR39 1 work table 120 1 1.4 1.40 XR42 1 scullery sink 120 1 0.25 5.8 0.70 XR55 1 milk cabinet 120 1 0.25 5.8 0.70 XR82 1 hot food serving ctr. 208 1 9.9 9.90 XR84 1 serving counter 120 1 1.4 1.40 XRW19 2 prep. table with sinks 120 1 1.4 2.80 XRW29 1 steamer 120 1 6 0.72 XRW32 6 convection oven 120 1 5.3 3.82 XRW53 1 ice maker with bin 120 1 20 2.40 XRW69 3 freezer 120 1 11 3.96 XRW86 1 cashier's counter 120 1 1.4 1.40 13 9 dishwasher 120 1 15 16.20 14 10 Range 120 1 5 6.00 17 1 garbage disposal 120 1 0.5 9.8 1.18 Assorted kitchen equipment total kVA = 196.96 Kitchen equipment kVA * 0.65 demand factor (Table 220.20) = 128.03

Laundry equipment XR75 3 washer 120 1 15 5.40 XR76 3 Dryer 120 1 5.9 17.70 Total laundry equipment kVA = 23.10

Table 5. Miscellaneous Receptacle Loads *Equipment listed without a rated current is treated as a standard 180 VA receptacle. Mark Qty Description V Φ I (A) kVA 1a 1 master maker 2400 208 1 15 3.12 1b 1 copier 3850 120 1 16 1.92 2 1 Press, standard, 1250 120 1 15 1.80 3 1 Press, l&w, cd, 1250 120 1 15 1.80 4 1 Press, cd, 1870 120 1 19 2.28 5a 1 collator, dedicated 120 1 12 1.44 5b 1 stitcher 120 1 8 0.96 5c 1 Folder 120 1 5 0.60 5e 1 trimmer 120 1 6 0.72 5f 1 BT15 120 1 0.18 5g 1 BT15 120 1 0.18 6 1 1090 photocopier 208 1 20 4.16 7 1 Drill 208 1 17 3.54 8 1 Cutter 208 1 9.4 1.96 9 1 platemaker 208 1 10 2.08 10 1 computer 120 1 0.18 11 1 printer 120 1 8.9 1.07 12 1 camera 208 1 18.5 3.85 13 1 darkroom sink light 120 1 0.18 14 1 contact & vacuum frame 120 1 1 0.12 15 1 pmt processor 120 1 0.18

Page 7 of 9 16 2 darkroom safe lights 120 1 0.36 17 1 point light source 120 1 0.18 18 1 refrigerator 120 1 0.18 19 2 light table, waxer, lecto stick 120 1 0.52 0.12 20 1 table top folder 120 1 3.5 0.42 21 1 jogger, calculator 120 1 0.18 22 1 jogger, electric stapler 120 1 0.18 23 3 Tables w/ double duplex 120 1 0.54 24 1 computer 120 1 4 0.48 25 1 computer 120 1 4 0.48 26 1 telephone (2) 120 1 0.18 27 1 5065 photocopier 120 1 19.8 2.38 28 1 Paper drill 208 1 14 2.91 29 1 Paper table 208 1 2.1 0.44 30 1 air compressor 208 3 25.3 7.44 31 1 Metal cutting saw 120 1 0.18 32 1 Metal storage 120 1 0.18 33 2 Spray booth 208 1 8 3.33 34 1 tool storage 120 1 0.18 35 3 scroll saw 120 1 1.2 0.43 36 1 band saw 208 3 7.1 2.09 37 1 sander 208 3 0.18 38 2 drill press 208 3 7.3 4.29 39 1 Buffer 208 3 3.2 0.94 40 1 grinder 208 3 6 1.76 41 1 vent forge 120 1 7 0.84 42 1 welding booth 208 1 60 12.48 1 208 1 20 4.16 43 1 engine lathe 208 3 0.18 44 1 soldering table 120 1 0.18 45 1 goggle cabinet 120 1 0.18 46 1 table saw 208 3 5.6 1.65 47 1 Joiner 208 3 6 1.76 48 1 planer 208 3 23.7 6.97 49 2 Jigsaw 120 1 1.2 0.29 50 1 drill press 120 1 9.8 1.18 51 2 sander 208 1 10 4.16 Total kVA for miscellaneous receptacle loads = 96.38

Table 6. Total Receptacle Loads and Demand Factor Qty kVA Ground Floor 519 93.4 First Floor 873 157.1 Second Floor 485 87.3 Miscellaneous 96.4 Raw Total 434.2 First 10 kVA x 1.0 Demand Factor 10 Remainder x 0.5 Demand Factor 212.1 Receptacle Demand Load = 222.1

Page 8 of 9 Table 7. Total Building Demand Load Demand Load kVA Lighting 756.4 Mechanical Equipment 525.1 Kitchen HVAC Equipment 14.1 Kitchen Assorted Equipment 128.0 Laundry Equipment 23.1 Receptacles 222.1 Total Building Demand Load 1669

Recommended size of Main Distribution Panel:

1669 kVA * 1.25 design factor = 2086 kVA __ __ Sdesign = √(3) V I => I = S / V / √(3) __ Idesign = 2086 / 480 / √(3) = 2.5 kA = 2500 A

MDP actual size = 800A x 4 + 225A = 3425 A

Even without including the spare 800A fused disconnect switch in the main distribution panel, it is sized sufficiently, with a bit of extra capacity for possible additions or for system flexibility.

Utility Rate Structure:

At this time, the owner has been unable to provide information on the utility rate structure, fault current, or electric utility load data. When this information becomes available this report will be edited to show relevant comparisons to the findings contained here.

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