LISA BORNEMANN, LIGHTING / ELECTRICAL

INDEPENDENCE VISITOR CENTER DR. MOECK PHILADELPHIA, PA OCTOBER 21, 2002

ELECTRICAL SYSTEMS EXISTING CONDITIONS AND

BUILDING LOAD SUMMARY REPORT

TABLE OF CONTENTS

1. EXECUTIVE SUMMARY 2. ELECTRICAL SYSTEMS EXISTING CONDITIONS AND

BUILDING LOAD SUMMARY REPORT 3. RISER DIAGRAM 4. UTILITY RATE STRUCTURE

EXECUTIVE SUMMARY

INDEPENDENCE VISITOR CENTER PHILADELPHIA, PA

EXECUTIVE SUMMARY

For the electrical systems existing conditions and building load summary report I examined the electrical and mechanical plans for the visitor center as well as the specifications. I familiarized myself with the drawings and learned a lot about the systems of the building and the locations of equipment. The riser diagram is very descriptive of how the entire electrical system works. It showed how the incoming 480/277V service is distributed throughout the building. There are electrical rooms on each level that contain the panel boards for that level. The main switchboard is located in the basement with most of the electrical equipment except the panel boards for the ground floor and mezzanine level. I performed load calculations for the mechanical equipment, lighting, and receptacles using NEC 1999 code loads. The total load I calculated for the building was under the rating on the main switchboard, so the system meets the requirements. I obtained a copy of the utility rate structure which is General Service from the MEP engineer. This is attached in the report. I have not yet received a summary of the Electric Utility Load Data for the previous months of operation. I have requested copies of the electric bills since the building opened last November, but I have not yet received them. A comparison will be made at a later date.

ELECTRICAL SYSTEMS EXISTING CONDITIONS AND BUILDING LOAD SUMMARY REPORT

LISA BORNEMANN, LIGHTING / ELECTRICAL

INDEPENDENCE VISITOR CENTER DR. MOECK PHILADELPHIA, PA OCTOBER 21, 2002

ELECTRICAL SYSTEMS EXISTING CONDITIONS

AND BUILDING LOAD SUMMARY REPORT SUMMARY OF SYSTEMS: PECO provides the incoming service to the Independence Visitor Center with the service feeder running underground from 6th Street. It is 480/277V, 3 phase, 4 wire grounded wye. The distribution is at 480/277V to the electric discharge lighting and large mechanical equipment. Local step-down transformers are used to derive 208/120V for incandescent lighting, general purpose receptacles and smaller mechanical power. SYSTEM TYPE The type of system in the Independence Visitor Center is a Radial System. This is the simplest of circuit arrangements with only one primary feeder from the utility and one transformer connected directly to the primary feed. The system in the visitor center has the entrance from the utility, PECO, which leads into 3 single phase PECO transformers and goes directly into the main switch board. The service feed runs underground to the PECO switch. From the PECO switch to the PECO transformers, the feeders are (3) 1/0 #2 AWG (15KV) & (1) #6 GND (600V). Then 4 sets of (4) 350 MCM & 1/0 Ground in 3 ½” Conduit connect from the transformers to the main switch board. Every other panelboard is connected to the main switch board. Refer to the attached riser diagram.

BUILDING UTILIZATION VOLTAGE

480/277 with local step-down transformers to derive 208/120V

TRANSFORMER CONFIGURATION

Transformers are dry type, general purpose with aluminum windings, 150 deg. C rise, 220 deg. C insulation system with ventilated enclosure.

Primary Voltage: 480V Delta Secondary Voltage: 208/120V 3 phase, 4 wire Wye *Note: See Dry Type Transformer Schedule on next page.

EMERGENCY POWER SYSTEM Emergency Generator:

(1) Natural Gas 480/277V, 3 phase, 4 wire, 35KW, 1800RPM Continuous standby power at 80% power factor

Powered by Panel ‘GDP’ Automatic Transfer Switches: ATS-1: 4 Pole, 70Amp, used for emergency loads

ATS-2: 4 Pole, 70Amp Standby loads for critical mechanical/ support equipment

Powered by Panel ‘GDP’ Emergency Panel Boards:

The emergency generator provides power directly to the distribution panel ‘GDP’. Panel ‘GDP’ services both ATS-1 and ATS-2. ATS-1 services the distribution panel for emergency lighting and power, panel ‘EHD1B’ and panel ‘ELB2’. Distribution panel ‘EHD1B’ directly services all of the 480/277V emergency panel boards. These include panels EHB, EDIM2, EH2, EH1, and EDIM. Each of these panel boards then uses a transformer to drop the voltage to 208/120V for additional panel boards ELB, EH2, and EH1. This covers all of the panel boards for emergency use controlled by ATS-1.

ATS-2 is the automatic transfer switch for standby loads such as critical mechanical and support equipment. ATS-2 provides power directly to panel board ‘SHB’ which connects to a transformer for panel board ‘SLB’ the 208/120V panel board.

(3) Emergency Panel boards:

‘EH2’: Corridor emergency lights, exit lights, office area emergency lighting, and panel board ‘EL2’, the 208/120V emergency panel board via transformer. This is all of the emergency power to the mezzanine level.

‘EH1’: Emergency lighting, exit lights, and ‘EL1’via transformer. This is all of the emergency power to the first level.

‘EHB’: Emergency lighting, exit lights, and ‘ELB’ via transformer. This is all of the emergency power to the Basement.

Emergency Lighting: All emergency lighting is fluorescent or compact fluorescent fixtures

with a voltage of 277V. There is a combination of recessed lensed troffers in the offices, surface mounted, vandal resistance 4 foot and 8 foot long fixtures in stairways, and other surface mounted or pendant mounted fixtures scattered throughout the building integrated into the existing fixture type of the space.

GENERAL DESCRIPTION OF OVERCURRENT PROTECTIVE DEVICES The main switch board and all 480V equipment relatively close to the service entrance have an A.I.C. rating of 30,000A. The 480V equipment that is located further downstream has an A.I.C. rating of 18,000A. The 208V equipment downstream has an A.I.C. rating of 10,000A. The main switch board is a low voltage (600V) switchboard with copper bus, fixed, individually mounted main circuit breaker rated at 1200 Amps with an adjustable solid-state trip unit and

group-mounted molded case feeder circuit breakers with adjustable trip units. The main circuit breaker is a molded case circuit breaker from Square D Company. Branch circuit breakers are all thermal magnetic molded case circuit breakers also from Square D Company. The Electronic Trip Molded Case Circuit Breakers are molded case circuit breaker type and should be provided with a Fixed Instantaneous (High Level Selective Override) circuit breaker. Fuses are current limiting types L, J, K-9, and RK-1 as required. The distribution panels are fused switch type. The branch molded case circuit breakers have fused main QMQB switched where required. GENERAL LOCATION OF SWITCHGEAR AND PANELBOARDS LOCATION OF ELECTRICAL EQUIPMENT Panel Designation Location Main Switch Board Location HB Electric Room B-13 MSB Electric Room B-13 LB (Section 1) Electric Room B-13 LB (Section 2) Electric Room B-13 EHB Electric Room B-13 Distribution Panel Location ELB Electric Room B-13 GDP Electric Room B-13 ELB2 Electric Room B-13 EHD1B Electric Room B-13

SHB Electric Room B-13 HDB Mechanical Maintenance B-16

SLB Electric Room B-13 HD2 Electric Room M-09 LBT1 B-16 H1 Electric Room 118 L1 (Section 1) Electric Room 118 Automatic Transfer Switch Location L1 (Section 2) Electric Room 118 ATS-1 Electric Room B-13 L1EA (Section 1) Electric Room 118 ATS-2 Electric Room B-13 L1EA (Section 2) Electric Room 118 EH1 Electric Room 118 EL1 Electric Room 118 Emergency Generator Location H2 Electric Room M-09 GENSET Mechanical Terrace RT-2 L2 (Section 1) Electric Room M-09 L2 (Section 2) Electric Room M-09 L1E (Section 1) Electric Room M-09 L1E (Section 2) Electric Room M-09 L1E (Section 3) Electric Room M-09 EH2 Electric Room M-09 EL2 Electric Room M-09 L1T Retail Space

The visitor center does not require any motor control centers because there was not a large concentration of fans or pumps requiring starters in any particular location. Instead, individually mounted combination starter/disconnects are used at the location of the equipment.

TYPICAL LIGHTING SYSTEMS

Emergency lighting: Fluorescent or compact fluorescent fixtures

Interior lighting: Theaters – incandescent downlights and wallwashers Bathrooms – compact fluorescent downlights Vestibule Alcove – compact fluorescent wall sconces Entry Vestibule (two-story area) – metal halide downlights NPS Exhibit – Tungsten halogen trackheads Ticketcounter – Compact fluorescent downlights Main Hall – Metal Halide Uplights and trackheads Special Events Room – Incandescent Chandeliers, trackheads, and downlights Offices and Conference Rooms – 2x2 and 2x4 recessed fluorescent fixtures

LAMPS AND BALLASTS SCHEDULE

100W A19 100 n/a n/a 100 12040W A19 40 n/a n/a 40 12025W S-11 25 n/a n/a 25 120GE 50W MR16 50 n/a n/a 50 120/12

Q71MR16/C 75 n/a n/a 75 120/12Q50 MR16 50 n/a n/a 50 120

GE 100 PAR38/HIR/NFL 100 n/a n/a 100 120

GE 90PAR38 HIR/FL 90 n/a n/a 90 120

Q250PAR38 250 n/a n/a 250 120Q150W DC-EFT 150 n/a n/a 150 120GE 100PAR38/HIR 133W/l.f. n/a n/a 133 W/l.f. 120

Emergency lighting is all fluorescent at 277V. All other lighting is at 120V or low voltage 12V. It is a combination of fluorescent, incandescent, and metal halide lamps. Above is a lamp and ballast schedule with the specific lamps used. Below is a description of the types of fixtures used in the different spaces throughout the building.

Lamp Ballast Current Power Factor

Lamp Wattage

Ballast Factor

Input Watts

Operating Voltage

Incandescent

(1) F14T5, F21T5, F35T5, as req'd 7 W/l.f.

Sylvania QT1X28/1

20PS1 10W/l.f. 120 0.28 0.97

(2) F24,32,40 T8/TL835 as req'd 16W/l.f. RCN-

2M32-MC 0.88 59 120 0.49 0.99

Philips PL-T32W/35/4P 32 ICF-2S26-

HI-LD 0.98 36 120 0.31 0.98

Philips (2) PL-C9W/35 9 H-2B9-TP-

BLS 0.99 26 120 0.23 0.96

Philips (2) PL-C/42W/35/4P 35 REZ-2T42-

M3-BS 1 98 120 0.82 0.98

Philips (2) PL-C13W/35 13 1CF-2S13-

HI-LD 1 29 120 0.25 0.99

Philips PL-S 13W 13 H-1B13-

TP-BLS 0.89 16 120 0.13 1.01

Philips CDM35/PAR20 35 71A5037B

P 1 48 120 0.19 0.95

Philips CDM70/PAR30 70 71A5237B

P 1 85 120 0.32 0.95

Philips CDM70/PAR38 70 71A5237B

P 1 85 120 1.2 0.95

Philips CDM100/PAR38 100 71A5337B

P 1 118 120 1.5 0.95

70W CDM T6 70 71A5281 1 94 120 0.85 0.95

Sylvania MP150/U/MED 175

Sylvania M150/

Multi-Kit1 185 120

MH400/HOR3200 400Sylvania

M400 Multi-Kit

1 452 120

Fiber optics 150W MH with illuminator

150 n/a n/a 200 120

LED 5 n/a n/a 5 120

Lamp Lamp Wattage Ballast Ballast

FactorInput Watts

Operating Voltage Current Power

Factor

Other

Fluorescent

Metal Halide

POWER FACTOR CORRECTION Power factor correction is not used on this system. There are no capacitors required in the system. UTILITY RATE STRUCTURE The Utility Rate Structure for this building is Rate-GS General Service from PECO Energy Company. A copy of the monthly rates is attached. AVAILABLE UTILITY FAULT CURRENT The existing utility fault current was unable to be obtained from the electrical engineer. He did however provide information to calculate the available fault current. The available fault current is the maximum current that can flow under the worst possible fault conditions. An infinite available fault current was conservatively assumed with a 750KVA service transformer with 5% impedance. In this case, the available fault current on the secondary of this transformer is about 20 times the full load current of the transformer.

Full load current = 750000VA = 902 A 1.732 x 480V Available Fault Current = 20 x 902 = 18,040 A On Secondary NEC BUILDING DESIGN LOAD CALCULATIONS NEC LIGHTING LOAD CALCULATIONS

TYPE OF OCCUPANCY

SQUARE FOOTAGE

UNIT LOAD PER SQUARE

FOOT

TOTAL LOAD (KVA)

Retail 2100 3 6.30Office 5095 3.5 17.83Storage 6000 0.25 1.50Corridors 170 0.5 0.09Stairways 1450 0.5 0.73Auditorium 2555 1 2.56Special Events Room 2325 2 4.65Vestibules 1205 0.5 0.60Exhibit Space 8365 4 33.46Bathrooms 1840 1 1.84Main Hall/Great room 9930 2 19.86 Total KVA = 89.41

*Note: Unit Load per Square Foot values were taken from Table 220-3(a), General Lighting Loads by Occupancies, from NEC 1999. Some occupancy types were matched to given closest given types. The unit load for the exhibit spaces are according to the Design Criteria received from the engineers.

MECHANICAL EQUIPMENT SCHEDULE

EF-1 Fan Ground level toilet Room HD2 3 480/277 2 3.4 3.74 2.80EF-5 Fan Basement Kitchen Hood HD2 3 480/277 1 2.1 2.31 1.73EF-8 Fan Condensate Hood HD2 3 480/277 0.50 1.1 1.21 0.91EF-9 Fan Boiler Flue 3 480/277 5.8A 5.8 6.38 4.77RF-1 Fan Great Room AC-6 HD2 3 480/277 5 7.6 8.36 6.26RF-3 Fan Office Unit AC-5 HD2 3 480/277 1.5 3 3.3 2.47SF-1 Fan Stair #4 Pressurization 3 480/277 0.75 1.6 1.76 1.32SF-2 Fan Stair #5 Pressurization 3 480/277 0.75 1.6 1.76 1.32CUH-5 Electric Cabinet Unit Heater Stair #5 H1 3 480/277 0.05 9.00CUH-6 Electric Cabinet Unit Heater Stair #4 H1 3 480/277 0.05 9.00HV-2 Hot Water - Heat. & Vent. Basement 3 480/277 7.5 11 12.1 9.05B-1 Boiler 3 480/277 38 50 55 41.15B-2 Boiler 3 480/277 38 50 55 41.15P-1 Pump Boiler B-1 SHB 3 480/277 7.5 11 12.1 9.05P-2 Pump Boiler B-2 SHB 3 480/277 7.5 11 12.1 9.05P-3 Pump Spare for B-1 and B-2 SHB 3 480/277 7.5 11 12.1 9.05AC-6 Gas Fired AC Unit Great Room HD2 3 480/277 7.5 11 12.1 9.05AC-1A Rooftop AC Unit-Supply Fan Exhibition East 3 480/277 20.0 27 29.7 22.22AC-1B Rooftop AC Unit-Supply Fan Exhibition West 3 480/277 20.0 27 29.7 22.22AC-2 Rooftop AC Unit-Supply Fan Retail H1 3 480/277 3.0 4.8 5.28 3.95AC-3 Rooftop AC Unit-Supply Fan Special Events 3 480/277 7.5 11 12.1 9.05AC-4 Rooftop AC Unit-Supply Fan Theaters 3 480/277 7.5 11 12.1 9.05AC-5 Rooftop AC Unit-Supply Fan Offices HD2 3 480/277 5.0 7.6 8.36 6.26AC-1A Rooftop AC Unit-Return Fan Exhibition East HD2 3 480/277 10.0 14 15.4 11.52AC-1B Rooftop AC Unit-Return Fan Exhibition West HD2 3 480/277 10.0 14 15.4 11.52AC-2 Rooftop AC Unit-Return Fan Retail 3 480/277 1.5 3 3.3 2.47AC-3 Rooftop AC Unit-Return Fan Special Events HD2 3 480/277 3.0 4.8 5.28 3.95AC-4 Rooftop AC Unit-Return Fan Theaters HD2 3 480/277 1.5 3 3.3 2.47Genset Emergency Generator Roof 3 480/277 46.9 61 67.1 50.21

Humidifier NPS Exhibit H1 3 480/277 8.10Gas Booster Rm. 132 H1 3 480/277 1.50

Symbol Equipment Type

3-PHASE EQUIPEMENT

Area Served HP Amps KVAPanel Board Phases Voltage Corrected

Amps

Irrigation Pump LBT1 3 208/120 5.10Motor Elevator 1 Motor Elevator 1 3 460 25 34 37.4 26.82Motor Elevator 2 Motor Elevator 2 3 460 25 34 37.4 26.82Motor Elevator 3 Motor Elevator 3 3 460 40 52 57.2 41.02Motor Elevator 4 Motor Elevator 4 3 460 40 52 57.2 41.02

472.40

Phases Voltage HP AmpsSymbol Equipment Type Area Served Panel Board

Corrected Amps KVA

3-Phase Total =

3-PHASE EQUIPEMENT

EF-2 Fan Mezzanine level toilet room L2 1 208/120 0.1667 0.40EF-3 Fan Electrical Room L2 1 208/120 77W 0.70EF-4 Fan Ticketing Toilet Room L1(2) 1 208/120 100W 1.00EF-6 Fan Elev. Mech. Room B-21 LB 1 208/120 100W 0.50EF-7 Fan Main Elec. Room B-13 1 208/120 0.5 5.4 5.4 1.01UH-1 Hydronic Unit Heater Mech. Room LB 1 208/120 0.05 0.20UH-2 Hydronic Unit Heater Fire Pump Room LB 1 208/120 0.05 0.20CUH-1 Cabinet Unit Heater Main Entrance L1 1 208/120 975 RPM 0.40CUH-2 Cabinet Unit Heater Main Entrance L1 1 208/120 975 RPM 0.40CUH-3 Electric Cabinet Unit Heater Vestibule 131 H1 1 480/277 0.05 2.00CUH-4 Cabinet Unit Heater Stair #3 L1 1 208/120 600 RPM 0.40CUH-7 Electric Cabinet Unit Heater GVC Retail L1T 1 208/120 0.05 0.50AC-7 Conditioning Air MDF Room LB 1 208/120 0.40AC-8 Conditioning Air IDF Room #1 L2 1 208/120 0.16667 0.80AC-9 Conditioning Air Telecom Room 117 L1 1 208/120 0.16667 0.40AC-10 Conditioning Air Electrical Room 118 L1 1 208/120 0.16667 0.40AC-11 Conditioning Air Elev. Mech. Room LB 1 208/120 0.16667 0.50FC-1 Fan Coil NPS Exhibit 1 208/120 0.84 8 8 1.50CU-7 Conditioning Unit MDF Room L2(2) 1 208/120 0.125 2.00CU-8 Conditioning Unit IDF Room #1 L2(2) 1 208/120 0.16667 2.00CU-9 Conditioning Unit Telecom Room 117 L2 1 208/120 0.16667 1.20CU-10 Conditioning Unit Electrical Room 118 L2(2) 1 208/120 0.16667 2.00CU-11 Conditioning Unit Elev. Mech. Room L2(2) 1 208/120 0.16667 2.00

20.91

472.4020.91

493.31

Panel Board Phases Voltage HP Amps

Total 3-Phase &1-Phase Mechanical Load (KVA) =

3-Phase Total = 1-Phase Total =

1-Phase Total =

Corrected Amps KVA

*Note: For all equipment, both 3-phase and 1-phase, a 0.9 power factor was assumed from the specifications. The amps were calculated for the 3-phase equipment using Table 430-150 from the NEC 1999 code and for the 1-phase larger equipment using Table 430-148 from the NEC 1999 code.

1-PHASE EQUIPEMENT

Symbol Equipment Type Area Served

RECEPTACLE LOADS

Location Number of Receptacles

Duplex Receptacles

Total Load (VA)

Basement 29 7 6480South Ground Level 30 0 5400North Ground Level 34 19 9540South Mezzanine 25 5 5400North Mezzanine 28 5 5940 Total VA = 32760 First 10,000 VA at 100% 10,000 Remaining at 50% 11380 Total VA = 21,380 Total KVA = 21.38 *Note: Demand factors taken from NEC Table 220-13.

SUMMARY OF ELECTRICAL LOADS

Load Total Load (KVA)

Lighting 89.41 Recepticles 21.38 Motor 493.31

Total KVA = 604.1 MAIN SWICH BOARD CALCULATION VA = √3*V*I*cosθ

I = 1200 V = 480

p.f = 1.0 KVA = 997.632

Design Factor (0.8) 798.106

*Note: The specs noted that all equipment have a minimum power factor of 0.90. A power factor of 1.0 was assumed for the main switch board calculation. Due to different power factors for all of the equipment, a design factor of 0.80 was factored into the KVA capacity of the main switch board.

As seen above, the total calculated load is less than the existing size of the main switchboard.

RISER DIAGRAM

UTILITY RATE STRUCTURE

Supplement No. 35 To Tariff Electric Pa. P.U.C. No. 3

Ninth Revised Page No. 45 PECO Energy Company Superseding Eighth Revised Page No. 45

RATE-GS GENERAL SERVICE AVAILABILITY. Service through a single metering installation for offices, professional, commercial or industrial establishments, governmental agencies, and other applications outside the scope of the Residence Service rate schedules. CURRENT CHARACTERISTICS. Standard single-phase or polyphase secondary service. MONTHLY RATE TABLE. FIXED DISTRIBUTION SERVICE CHARGE: $ 6.63 for single-phase service without demand measurement, or $ 8.67 for single-phase service with demand measurement, or $23.45 for polyphase service.

METERING AND BILLING CREDITS A customer receiving Advanced Meter Services from a AMSP other than the Company will receive a credit on the Fixed Distribution Service Charge equal to the Total Metering Credit set forth for this Base Rate in Appendix B to the Joint Petition for Full Settlement. A customer receiving Consolidated EGS Billing will receive a credit on the Fixed Distribution Service Charge equal to the Billing and Collection Credit set forth for this Base Rate in Appendix B to the Joint Petition for Full Settlement.

VARIABLE DISTRIBUTION SERVICE CHARGE: 3.26¢ per kWh for the first 80 hours’ use of billing demand * 1.53¢ per kWh for the next 80 hours’ use of the billing demand 0.97¢ per kWh for additional use; except 0.42¢ per kWh over both 400 hours’ use of billing demand and 2,000 kWh COMPETITIVE TRANSITION CHARGE: 6.89¢ per kWh for the first 80 hours' use of billing demand * 3.31¢ per kWh for the next 80 hours' use of billing demand 2.13¢ per kWh for additional use; except 1.01¢ per kWh over both 400 hours' use of billing demand and 2,000 kWh. ENERGY AND CAPACITY CHARGE: The following Energy and Capacity Charges will apply to the customer if the customer receives Default PLR Service. These charges are not applicable to the customer if it obtains Competitive Energy Supply. 10.56¢ per kWh for the first 80 hours' use of billing demand (I) * 5.74¢ per kWh for the next 80 hours' use of billing demand (I) 4.17¢ per kWh for additional use; except (I) 2.65¢ per kWh over both 400 hours' use of billing demand and 2,000 kWh. (I) * During October through May this block is eliminated. TRANSMISSION SERVICE FOR CUSTOMERS RECEIVING DEFAULT PLR SERVICE: Unless such a customer is able to obtain transmission service on its own, PECO Energy will provide transmission service, and will impose charges on such a customer for such transmission service. STATE TAX ADJUSTMENT CLAUSE, NUCLEAR DECOMMISSIONING COST ADJUSTMENT APPLY TO THIS RATE. DETERMINATION OF DEMAND. The billing demand will be measured where consumption exceeds 1,100 kilowatt-hours per month for three consecutive months; or where load tests indicate a demand of five or more kilowatts; or where the heating modification is applied; or where the customer requests demand measurement. Measured demands will be determined to the nearest 0.1 of a kilowatt but will not be less than 1.2 kilowatts, and will be adjusted for power factor in accordance with the Rules and Regulations. For those customers with demand measurement, during October through May the billing demand will not be less than 40% of the highest billing demand in the preceding months of June through September (applied on an unbundled basis)., nor less than the minimum value stated in the contract for service. If a measured demand customer has less than 1,100 monthly kilowatt-hours of use, the monthly billing demand will be the measured demand or the metered monthly kilowatt-hours divided by 175 hours, whichever is less, but not less than 40% of the highest billing demand in the preceding months of June through September, nor less than 1.2 kilowatts. There will be a one-time waiver of the application of the previous sentences as they relate to minimums associated with PLR Energy and Capacity charges the first time a customer at a service location elects to receive Competitive Energy Supply. This one-time waiver is specific to a particular service location unless a new entity has assumed operation of the service location from a customer which has ceased operations at that location as a result of dissolution provided the new entity was not created through merger, partnership, joint venture, acquisition and/or any other type of combined business structure with the former customer. For those customers without demand measurement, the monthly billing demand will be computed by dividing the metered monthly kilowatt-hours by 175 hours. The computed demand will be determined to the nearest 0.1 of a kilowatt, but will not be less than 1.2 kilowatts. ( I ) Denotes Increase ____________________________________________________________________________________________________ Issued December 21, 2001 Effective January 1, 2002

Supplement No. 35 To

Tariff Electric Pa.P.U.C. No. 3 Fifth Revised Page No. 46 PECO Energy Company Superseding Fourth Revised Page No. 46 MINIMUM CHARGE The monthly minimum charge for customers without demand measurement will be the Fixed Distribution Service Charge. The monthly minimum charge for customers with demand measurement will be the Fixed Distribution Service Charge, plus a charge of $5.81 per (I) KW of billing demand, as follows: Variable Distribution-$0.84 per kW; Competitive Transition Charge-$1.82 per kW; Energy and Capacity-$3.15 per kW (Energy and Capacity Charge applicable only if Customer receives Default PLR Service). (I) HEATING MODIFICATION.

Wood, solar, wind, water, and biomass systems may be used to supply a portion of the heating requirements in conjunction with service provided hereunder. Any customer system of this type that produces electric energy may not be operated concurrently with service provided by the Company except under written agreement setting forth the conditions of such operation as provided by and in accordance with the provisions of the Auxiliary Service Rider. METERING. A. Single Meter.

Applicable where an area is heated solely by permanently connected electric space heating installations (1) acceptable to the Company, (2) sensitive to outdoor temperature and (3) not less than 5 kilowatts. Qualifying electric heating systems are (1) electric resistance coils, (2) electric resistance baseboards, (3) electric boilers and (4) heat pumps with electric back-up. During October through May the monthly maximum measured demand shall be reduced by one-half of the difference between the peak winter measured demand and the base load demand over the two most recent winter seasons preceding the start of the current winter season (October 1st). The demand reduction will be subject to annual review and any revisions will be based on the two most recent winter seasons. The base load demand will be defined as the lowest measured demand during the period from October to May. For time-of-use metered customers, the demand reduction will be based upon the difference between the peak winter and base load demands regardless of whether they occur on or off peak. During this period, the billing demand shall never be less than 15 kilowatts; except for those customers in service as of February 18, 1971, the billing demand during October through May shall not be less than one-half of the monthly measured demand. A customer whose demand reduction was calculated under the methods in effect on October 17, 1996, will continue to receive the same reduction until January 2, 2000 unless the current method (described in the preceding paragraph) yields a smaller billed demand for the customer.

A customer who adds new electrical connected heating load will receive the same proportion of forgiven demand to total demand that they currently receive. This demand modification will only be applicable within 30 days of the date that the customer requests billing under this provision. It shall be the responsibility of the customer to notify the Company of any subsequent changes to its heating equipment or requirements. B. Separate Meters. At the option of the customer, electricity supplying permanently connected space heating installations or heating equipment sensitive to outdoor temperature with a total capacity of not less than 5 kilowatts, which are acceptable to the Company, will be measured apart from the customer's other requirements for electric service at the premises. Air conditioning equipment of rated electrical capacity up to twice that of the heating equipment also may be supplied through this separate heating circuit. During October through May the usage of this separate circuit shall be billed at the charges listed below in lieu of the pricing of the basic Monthly Rate Table. VARIABLE DISTRIBUTION SERVICE CHARGE: 0.76¢ per kWh COMPETITIVE TRANSITION CHARGE: 1.71¢ per kWh ENERGY AND CAPACITY CHARGE: The following Energy and Capacity Charges will apply to the customer if the customer

receives Default PLR Service. These charges are not applicable to the customer if it obtains Competitive Energy Supply: 3.59¢ per kWh (I)

During June through September the combined usage shall be billed under the price provisions of the basic Monthly Rate Table. TRANSMISSION SERVICE FOR CUSTOMERS RECEIVING DEFAULT PLR SERVICE: Unless such a customer is able to obtain transmission service on its own, PECO Energy will provide transmission service, and will impose charges on such a customer for such transmission service. OFF-PEAK THERMAL STORAGE PROVISION. Off-peak energy may be provided exclusively for qualifying Thermal Storage applications only in conjunction with this rate schedule when the load supplied is separately metered. This service will be billed separately at the rate of $11.21 per month, plus the charges listed below.

OFF-PEAK USAGE DURING THE WINTER AND SUMMER MONTHS: VARIABLE DISTRIBUTION SERVICE CHARGE: 1.28¢ per kWh COMPETITIVE TRANSITION CHARGE: 0.86¢ per kWh

ENERGY AND CAPACITY CHARGE: The following Energy and Capacity Charges will apply to the customer if the customer receives Default PLR Service. These charges are not applicable to the customer if it obtains Competitive Energy Supply:

1.74¢ per kWh (I) (I) Denotes Increase

Issued December 21, 2001 Effective January 1, 2002

Supplement No. 35 To Tariff Electric Pa.P.U.C. No. 3 Fifth Revised Page No. 47 PECO Energy Company Superseding Fourth Revised Page No. 47

ON-PEAK USAGE DURING THE WINTER MONTHS:

VARIABLE DISTRIBUTION SERVICE CHARGE: 1.98¢ per kWh COMPETITIVE TRANSITION CHARGE: 1.32¢ per kWh ENERGY AND CAPACITY CHARGE: The following Energy and Capacity Charges will apply to the customer if the customer receives Default PLR Service. These charges are not applicable to the customer if it obtains Competitive Energy Supply.

2.68¢ per kWh (I)

TRANSMISSION SERVICE FOR CUSTOMERS RECEIVING DEFAULT PLR SERVICE: Unless such a customer is able to obtain transmission service on its own, PECO Energy will provide transmission service, and will impose charges on such a customer for such transmission service. During the summer months, any on-peak demand and energy will contribute to the pricing of the basic Monthly Rate Table. To qualify for this provision, the customer must submit an engineering study performed by a professional engineer registered in the Commonwealth of Pennsylvania to the Company for technical review and approval. On-peak hours are defined as the hours between 8:00 a.m. and 8:00 p.m., Eastern Standard Time or Daylight Saving Time, whichever is in common use, daily except Saturdays, Sundays and holidays; except that the on-peak hours will end at 4:00 p.m. on Fridays. Off-peak hours are defined as the hours other than those specified as on-peak hours. For Cooling Thermal Storage applications, during the months of June through September, on-peak hours will commence at 10:00 a.m. instead of 8:00 a.m. SPECIAL PROVISION. In accordance with Section 1511, Title 66 Public Utilities, a volunteer fire company or a non-profit senior citizen center may, upon application, elect to have its electric service billed at the pricing of Rate R Residential Service, Rate RT Residential Time of Use, Rate R-H Residential Heating Service, or Rate OP Off-Peak Service as appropriate for the application. The execution of a contract for a minimum term of one year will be required. For the purposes of this provision, the following words and terms shall have the following meanings, unless the context clearly indicates otherwise: VOLUNTEER FIRE COMPANY - a separately metered service location consisting of a building, sirens, a garage for housing vehicular fire fighting equipment, or a facility certified by the Pennsylvania Emergency Management Agency (PEMA) for fire fighter training. The use of electric service at this location shall be to support the activities of the volunteer fire company. Any fund raising activities at this service location must be used solely to support volunteer fire fighting operations. The customer of record at this service location must be a predominantly volunteer fire company recognized by the local municipality or PEMA as a provider of fire fighting services. NON-PROFIT SENIOR CITIZEN CENTER - a separately metered service location consisting of a facility for the use of senior citizens coming together as individuals or groups and where access to a wide range of services to senior citizens is provided. The customer of record at this service location must be an organization recognized by the Internal Revenue Service (IRS) as non-profit and recognized by the Pennsylvania Department of Aging as an operator of a senior citizen center. TERM OF CONTRACT. The initial contract term shall be for at least one year. PAYMENT TERMS. Standard. (I) Indicates Increase _______________________________________________________________________________________________________ Issued December 21, 2001 Effective January 1, 2002