PART 6 ATTACHMENT J_MCBCL ELEC DESIGN GUIDE 5.4.20.pdf

MCB CAMP LEJEUNE, NC

PUBLIC WORKS DIVISION DESIGN BRANCH

ELECTRICAL POLICIES & CRITERIA

May 4, 2020

PREFACE

The purpose of this document is to provide key design guidance for electrical systems installed at MCB Camp Lejeune, North Carolina. All electrical design shall be coordinated with the Unified Facilities Criteria (UFC) requirements. The UFC is a planning, design, construction, sustainment, restoration, and modernization criteria that applies to all DoD activities. Compliance with the UFC is mandatory for the design of electrical systems at all facilities and bases. Designs shall incorporate customer requirements, local past practices, and unified facilities criteria to deliver a fully functional, safe, code compliant, and effective project. UFC shall be employed to the maximum extent practicable in each design. Policies in this document are supplemental local directives to be applied in conjunction with the UFC requirements under engineering judgement. Design deviation requests from the UFC shall be submitted in writing via electronic mail. Requests for deviation shall be sent to the electrical design branch and include the project title, contract number, designer name, drawings, UFC reference, and reason for deviation.

KEY DESIGN CRITERIA & CODES

1. NFPA 70 National Electrical Code

2. NFPA 72 National Fire Alarm Code

3. NFPA 101 Life Safety Code

4. UFC 3-501-01 Electrical Engineering

5. UFC 3-520-01 Interior Electrical Systems

6. UFC 3-530-01AN Design: Interior and Exterior Lighting and Controls

7. UFC 3-550-03FA Design: Electric Power Suppy and Distribution

8. UFC 4-010-01 DoD Minimum Antiterrorism Standards for Buildings

9. UFC 1-200-01 Design: General Building Requirements

10. Unified Facility Guide Specifications (26 00 Series)

11. IESNA Illuminating Engineering Society of North America

12. IEEE C2 National Electrical Safety Code

13. MIL HDBK 1190 Military Handbook for Facility Planning and Design Guide

14. MIL HDBK 1191 Military Handbook for Medical and Dental Treatment Facilities

15. TM 5-811-3 Electrical Design: Lightning and Static Electricity Protection

16. TI 800-01 Design Guide

17. TI 800-03 Design Build Instructions

18. TM 5-811-1 Electrical Power Supply and Distribution

19. TM 5-811-3 Electrical Design Lightning and Static Electricity Protection

20. TI 811-16 Lighting Design Guide

21. International Building Code

22. ASHRAE 90.1

GENERAL CRITERIA & CODES

1. Include electrical calculations with each design. Full load analysis and short circuit calculation sum-maries shall be provided for all projects and displayed on drawings. Provide calculation summaries, where applicable, for:

• Protective device time-current coordination

• Arc flash analysis

• Voltage drop

• Lighting

• Lightning Protection

• ASHRAE 90.1

2. Apply the demand factors to load analysis to determine transformer size. Do not exceed a trans-former size greater than 12 VA/SF of facility gross floor area or 70% of the total connected load on installations served by tranformer 300 kVA or greater.

3. Design the electrical system such that any fault in the system will be preferentially isolated by the selective operation of the overcurrent protective device closest to the faulted condition.

4. The designer of record is responsible for the selective coordination of overcurrent protective de-vices, including protective relays and medium voltage protective devices, primary transformer pro-tection, main secondary breakers, and secondary feeder protective devices. Ensure coordination between the new equipment and the existing distribution system.

5. Select system voltage based on projected building loads:

• Three phase four wire 208Y/120V systems shall be selected for loads less than 150kVA.

• Three phase four wire 480Y/277V systems shall be selected for loads greater than 150kVA.

• 208Y/120V systems can be selected for loads exceeding 150 kVA if a full life cycle cost analysis has be completed and found to be more cost effective. Submit life cycle cost analysis as part of project documentation.

6. Evaluate each design for the energy savings possible by installing conductors of one size larger than required by the NEC. Increasing the wire size often generates a short payback. Increasing the wire size to one size larger than required by the NEC can produce the following benefits:

• Energy savings will be realized due to lower heating losses in the larger conductors.

• Less heat will be generated by the wiring system.

• The conductors will have smaller voltage drop.

• The system can better accommodate the adverse effects of nonlinear loads.

See the Tri-Service Electrical Working Group (TSWEG ) TP-1 for calculation methods and further discussion on potential savings that can be realized.

7. The designer of record is responsible for providing to the contractor settings for relays, main sec-ondary breakers, and related protective devices in the circuit.

8. Size service and feeder conductors for a maximum voltage drop of 2% at the circuits rated capacity.

Branch circuits can be sized for a maximum 3% voltage drop at the circuits rated capacity.

9. Provide pad mounted transformers rather than pole mounted transformers for new three phase installations larger than 75kVA. Three phase pole mounted installations are limited to (3)-25 kVA and single phase pole mounted to (1)-75 kVA pole mounted transformer.

10. Provide two pad mounted transformers in lieu of one 480Y/277V service if the required 208Y/120V load exceeds 40% of the 480 volt service transformer capability.

11. The designer of record shall complete a detailed lightning risk assessment under NFPA 780 Annex L. The lightning risk assessment shall be considered when making determinations for lightning pro-tection measures. The lightning risk assessment summary shall be included in the drawings or as a individual document in the project package.

MEDIUM VOLTAGE DISTRIBUTION

1. Specify narrow profile construction for pole top electrical distribution. Provide steel crossarms for deadends and where required.

2. Specify #2 or 394.5 Kcmil all aluminium alloy conductor (AAAC) for overhead primary conductors, as appropriate.

3. Specify #2 or #4/0 stranded copper ethylene propylene rubber (EPR) 133% insulated cable with 100% concentric neutral with jacket for medium voltage underground distribution work. Medium voltage conduits shall not less than 5” per UFC. Avoid the use of tape shield cable with a seperate neutral.

4. Specify above ground junction boxes or above ground sectionalizers for medium voltage under-ground distribution work. Equipment shall utilize dead front construction with minimum 200 amp, 15kV load break elbow connectors.

5. Manholes or handholes are not permitted for use with medium voltage underground distribution work.

6. Specify #4 copper grounding conductors for all power poles.

7. Specify pressure treated pine (CCA) 40’ class 3 power poles as a minimum. Larger class pole shall be used as required.

8. Pad mounted medium voltage distribution transformers shall be delta primary, grounded wye sec-ondary configuration. Pad mounted medium voltage distribution transformers shall utilize dead front construction with minimum 200 amp, 15kV load break connectors. Insulating fluid shall be flammable retardant biodegradable type. Surge arresters shall be rated minimum 10kV provide tap changer with (2) 2 .5% taps above and below rated voltage. Locate pad mounted transformers at least 25 ft. from building and not adjacent to egress paths from building.

9. Pole mounted medium voltage distribution transformers shall be connected grounded wye primary with appropriate secondary. Insulating fluid shall be flame retardant biodegradable type. Surge arrester shall be rated minimum 10kV. Fused cutouts shall be non-load break 100 amp rated with fuses sized as required based upon transformer rating.

10. At Onslow Beach complex specify 33 kV Class insulators with RG glazing and bushings, and copper conductors for 12.47 kV primary overhead distribution system with copper secondaries. At On-slow Beach complex specify stainless steel enclosures for overhead distribution transformers and exterior switchgear. Locate medium voltage equipment above surge tide level.

11. All medium voltage work shall include right-of-way clearing on existing distribution circuit. Utility right-of-way shall be a minimum 30 ft. on each side of the utility pole line creating a 60 ft width right-of-way. Right-of-way shall be cleared of limbs, trees, and vegetation from earth to sky. Trees or limbs extending into the sky area of the right-of-way shall be side trimmed to achieve the 30ft.

distance requirements from centerline. Support guys and other equipment that extend into the utility right-of-way shall be cleared to maintain 10ft. clearance on all sides.

12. Minimum copper ground rod size is 10 ft. x 3/4” inch diameter.

13. Notify the project manager whenever trees are to be disturbed in the electric right-of-way prior to performing work.

14. Electrical contractors must possess a valid North Carolina Public Utility Electrical contractors license and be insured to do such work in the State of North Carolina.

15. Provide a pre-cast concrete box pad for transformers and other medium voltage equipment. A sample box pad detail is available upon request.

16. Minimize the use of photocells on exterior lighting where feasible. Provide a single photocell cabinet with contactors to control exterior lighting.

17. All concrete pads for exterior equipment shall be a minimum of 12” above finished grade and extend 8” beyond equipment footprint.

INTERIOR ELECTRICAL

1. Provide a minimum 15% spare and space capacity for all panelboards. Provide extra spare conduits extended above ceilings and below floors as necessary to accomodate potential use.

2. Specify metal clad switchgear for service entrance equipment when the service is 1200A or larger and all the branch feeder circuits are large such as 600A or 800A each.

3. Specify switchboards when service entrance is 1200A or larger and have combined feeder sizes between 20A and 800A.

4. Specify panelboards when service entrance equipment is less than 1200A.

5. Provide arc-fault circuit interrupter protection for branch circuits in dwelling units, dormitory units, guest rooms, guest suites as required by 210.12 of NFPA 70.

6. Provide surge protective device (SPD) on service equipment on buildings and panels serving com-puter and electronic equipment

7. Branch circuit conductor minimum size shall be 12 AWG copper with THHN or THWN insulation.

8. Minimum breaker size is 20A. Smaller breakers are acceptable when required by a specific applica-tion such as fractional horsepower motor circuits.

9. Provide weatherproof GFCI duplex receptacle outlet within 25 feet of exterior HVAC equipment.

10. Specify LED illuminated exit signs with 90 minutes of battery backup capabilities to meet require-ments of exit identification in accordance with NFPA 101.

11. Combination exit/emergency luminaires shall be used in accordance with NFPA 101 standards.

12. Specify stand alone wall or ceiling mounted emergency luminaires with 90 minutes of battery backup capabilities to meet requirements of egress illumination in accordance with NFPA 101.

13. General area luminaires with emergency battery backup are not authorized for use where stand-alone type emergency wall packs are sufficient in providing egress illumination.

14. Specify exterior egress path emergency illumination in accordance with NFPA 101.

15. Connect exit sign and emergency luminaire ahead of the switch to the normal lighting circuit that is located in the area or room that exit/emergency luminaires are serving.

16. Electric Motors: Multi-voltage electric motors are acceptable. Well pump motor controllers shall be provided with soft starters. Motors shall be Premium efficiency.

17. Electrical Raceways: Use painted surface metal raceways on existing finished surface in adminis-tration spaces in lieu of exposed conduit. Provide (3) 3/4 inch and (2) 1-inch empty conduits where panelboards are flush-mounted. Run concealed in walls to above accessible ceiling and terminate to all flush-mounted panelboards; cap these conduits.

18. Specify LED high bay luminaires for high bay applications in lieu of conventional HID luminaires.

The use of conventional HID fixtures are not authorized for use.

19. Dual technology occupancy sensor switches (i.e. passive infrared and ultrasonic) shall be utilized when required. Occupancy sensor switches shall be permitted in sleeping rooms only if a manual bypass OFF switch is incorporated.

20. Street and parking area lights are required to be architectural or cobrahead style LED type. LED luminaires shall meet the outdoor pole mounted area and roadway LED luminaire specification.

21. No multi-wire branch circuits allowed. Each circuit requiring a neutral conductor shall have its own separate dedicated neutral conductor. This does not apply to a circuit that feeds a single piece of equipment such as a cooking range or clothes dryer.

22. LED and drivers shall be rated for a minimum of 70,000 hours and entire fixture shall be warranted for at least five years for parts and labor. LED street lights shall have a color temperature 4000k.

23. Specify LED luminaires for interior lighting.

24. All fixtures shall be tested by an independent third party laboratory. Supplier shall submit LM-79-08 test results along with LM-80-08 results.

25. LED fixtures should have a replaceable driver and lighting array. LED lighting manufacturer should have a readily accessible supply chain for replacement parts.

26. Occupancy sensors in multi-person restrooms are not permitted.

27. Lighting controls that utilize light harvesting are not permitted.

28. A utility meter is required for electrical service but sub-metering of electrical circuits within build-ings per ASHRAE 90.1 is not required.

GENERATORS

1. Provide NEMA 3R 3-pole double throw electrical switch with solid neutral connection, concrete pad, equipment mounting rack, and automatic transfer switch for load bank testing. Bus bar lugs shall be bronze or tin plated copper (Aluminum is not acceptable). Double throw switch to have lockable functionality between generator to ATS operation or generator to load bank testing oper-ation. Mark phase rotation on electrical equipment.

2. Provide generators with engine block heaters, alternator anti-condensation heater and battery charger. Each device shall be fed from dedicated branch circuit from building generator serves.

3. Provide generator platforms for all generators where generator base tank exceeds 30 inches in height above finished grade. Platforms shall be 6 inches below generator housing doors. Platform shall be wide enough to accommodate 180 degree door opening radius but shall not be less than 36 inches wide. Platform shall encompass generator 360 degrees. Platform shall not obstruct fuel fill port, fuel vent port, or any other generator equipment. Platform shall be constructed with hot dipped galvanized steel to include flooring, rails and stairs. Provide stairs with a rise and run in accordance with local building code. Ground and bond all platform material in accordance with NFPA 70 and UFC guidance.

4. Provide factory installed cam lock connections mounted into exterior of switch enclosure with NEMA 3R cam lock covers.