B2_DRAFT_03.3_Section_C_Appendix_B_SLAC_Electrical_Design_Standards.pdf

Facilities & Operations

Document Type

Document Title: ELECTRICAL DESIGN STANDARDS

Document Number: SLAC-I-720-0A26E-001-R000 Page 1 of 27

The only official copy of this file is located in the Controlled Document Site.

Before using a printed/electronic copy, verify that it is the most current version.

1 Purpose

The purpose of this document is for Architectural and Engineering firms, subcontractors, consultants to follow set of standards in design and construction of new facilities or modernization of existing facilities.

2 Scope

The Electrical Design Standard consists of a set of requirements for deliverable packages of electrical drawings, design reports, and construction specification to be developed by SLAC design engineers and/or A/E subcontractor design firms.. Design and construction firms are fully responsible and liable for their designs and construction, regardless of the extend to which the electrical design standard are or followed in the project, and regardless of any approvals or acceptance of design or construction documents by SLAC or its personnel.

3 Definitions

A/E Firm Architectural & Engineering (A/E) Company

ANSI American Nations Standard Institute

BIO Building Inspection Office

Deliverables

HPSB

AutoCAD files, PDFs, Word files, Excel spreadsheets, image files, electronic or otherwise.

Federal High Performance & Sustainable Buildings

IEEE Institute of Electrical and Electronic Engineers

IESNA Illuminating Engineering Society of North America

LEED Leadership in Energy and Environmental Design

NEC National Electrical Code

NEMA National Electrical Manufacturer Association

SCADA Supervisory Control And Data Acquisition

SEDA

SLAC Online Drawing Access – a repository of darwing image files rather than the CAD files

SLAC

SLAC National Accelerator Laboratory operated by Stanford University for US Department of Energy

UL Underwriters Laboratories

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4 General Overview

4.1 Description

A. The purpose of this document is to provide general design requirements types of project at SLAC National Accelerator Laboratory. Design Standards for a description of the general scope of design and construction administration services.

B. Specific information on products and installation requirements are contained in SLAC Division 26 electrical specification sections.

C. Designers (design subcontractors) shall be liable for the cost of redesign and design-build contractors shall be liable for additional costs of rework caused by not complying with these requirements.

4.2 Deviation from design standard.

A. A deviation from electrical design standard may be granted subject of approval, however please submit in writing the proposed deviation to SLAC electrical design standard.

1. The proposed deviation cannot be proposed on grounds of convencience such as project schedule or cost.

2. The proposed deviation shall be a subject of approval by BIO electrical safety officer, project electrical subject matter expert, and electrical power department manager.

4.3 Coordination

A. The design shall be fully coordinated with other related architectural and engineering disciplines to eliminate conflicts, errors, and omissions, and to ensure that the total project requirements are met. Prudent judgment must be exercised in collaborating design solutions with SLAC personnel.

B. All design/construction drawings shall follow SLAC drawing procedures and standards, unless specifically described otherwise in specific Sections of this SLAC Design Standards.

C. Lighting design reference guide: The IESNA Lighting Handbook Reference and Application, Current Edition, by IESNA

D. Drawings Standards: Reference SLAC Drafting Standards DS-016-410-18 CAD standards including title block.

E. Codes And Standards

Design work shall comply with the current adopted edition of all applicable county, state and federal codes and standards. In addition, the current adopted edition of the following codes, standards and publications, are considered as the governing references to this section. Applicable recommendations of related trade and professional associations not listed here shall also be considered.

1. Leadership in Energy and Environmental Design (LEED)

2. Federal High Performance & Sustainable Building Guiding Principles 2016

(HPSB)

3. California Green Building Standards Code (CCR, Title 24, Part 11 – CALGreen)

4. California Building Code (CBC)

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5. California Energy Code (CEC)

6. American National Standards Institute (ANSI)

7. ASHRAE/IESNA Standard 90.1-2004, Energy Standard for Buildings Except Low- Rise Residential – Lighting Section 9

8. American Society for Testing Materials (ASTM)

9. Factory Mutual Engineering Corporation (FM)

10. Interior lighting shall be International Electrotechnical Commission (IEC)

11. Institute of Electrical and Electronic Engineers (IEEE)

12. Illuminating Engineering Society of North America (IESNA)

13. International Power Cable Engineers Association (IPCEA)

14. Joint Industry Conference (JIC)

15. National Electric Code (NEC)

16. National Electrical Manufacturer Association (NEMA)

17. National Fire Protection Association (NFPA)

18. Occupational Safety and Health Administration (OSHA)

19. Underwriters Laboratories (UL)

20. International Code Council (ICC)

5 Electrical Design Guidelines

5.1 SLAC High Voltage Transmission Lines and Substation.

Engineering design to build new or modify existing 230kV and 60kV transmission lines and substation is subject of guidelines separate from this standard.

The A/E firm hired for this type of work shall follow these guidelines and additionally to it include:

A. Propose master substation modification with minimal impact to existing operation. A drop and pick or open transition configuration scheme is not acceptable.

B. A power study is required for sizing of master substation components, including breakers, transformers, cable sizing, power quality correction equipment, and protection elements.

C. A/E Company Engineer Company Engineer shall engage with SEL for design of master substation modification.

5.2 SLAC Medium Voltage Power Distribution

A. New incoming medium voltage service shall be dual source with two separate feeds.

They shall be fed from separate sources or buses. Refer to SLAC Electrical Engineer to provide point of connection for medium voltage sources. If new substation is part of the loop, both incoming feeders shall be sized the same as the incoming feeders to the source substation where new substation is connected. In cases where the substation is

Document Number: SLAC-I-720-0A26E-001-R000 Page 4 of 27 not a part of the loop, the feeder shall be sized per calculated maximum load and short circuit currents.

B. All medium voltage underground feeders shall be installed in concrete encased duct banks with minimum of two (2) spare conduits. All required manholes shall be accessible to vehicles for pumping out of water. The new conduits shall not be smaller than 5-inch in diameter. If new feeder is not in existing duct bank, at least one spare conduit in such duct bank shall be left unused. .

C. The switchgears, transformers and other substation equipment shall be mounted on a concrete pad. Provide grounding grid including Ufer ground.

D. For large or complex buildings and facilities, the substation shall be built in a separate structure. Substation building must include ramp, rollup door, two man door exits, house power and lights fed from local 480VAC or 208VAC panelboards or medium voltage control power transformers (CPT), battery backed combo exit lights, fire extinguisher, heater, exhaust fan, etc. Substation roll-up door entrance shall be accessible by vehicle. Design must include minimum of two (2) spare breakers on each bus.

E. For large or complex buildings and facilities provide a medium voltage vacuum breaker switchgear lineup in “Main – Normally Open Tie – Normally Closed Tie – Main” configuration in substation building to house equipment. Substation must include control power transformers (CPT) on line side of each incoming feeder with automatic transfer device (IEEE 83) on secondary side, battery charger, storage battery bank, instrument transformers, protection relays, power meters, remote racking device, circuit breaker remote control panel, lifting truck, convenience receptacles, telephone outlet, telecom backboard, and etc. Space should be provided for planned switchgear additions as well as a provision for 25% future growth. Medium voltage switchgear shall satisfy the following requirements:

1. Shall be arc resistant IEEE C34.20.7 Type NEMA 2B

2. Drawout breakers shall be provided with adjustable LSIG trip units

3. Provide arc reduction maintenance system (ARMS) per NEC 240.87

4. Switchgear shall be built with insulated bus system

5. Remote racking device shall be able to operate with doors closed

6. Shutters shall be closed in disconnected and withdrawn positions

7. Externally visible indication of shutter position (disconnected or withdrawn) shall be provided

8. There shall be no exposed energized parts with doors open

9. Circuit breaker remote operating panel (CBROP) with control switches, position indication andARMS status indication shall be provided

10. Metal-Clad switchgear shall be provided with grounded non-ventilated metal barriers between vertical, center (horizontal bus compartment) and rear sections (load terminations).Sections

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F. Smaller buildings or facilities where new medium voltage switchgear lineup is not cost effective depending on project complexity or building configuration consider the following options:

1. Option 1: Pad-mounted medium voltage switchgear feeding transformers. Specify solid dielectric (SD-type) pad-mounted switchgear if calculated short circuit currents do not exceed 20kA (Sym.) and SF6 switchgear if short circuit currents do not exceed 25kA (Sym.). In cases when calculated short circuit currents exceed 25kA (Sym.) provide a medium voltage vacuum breaker switchgear lineup in “Main – Normally Open Tie – Normally Closed Tie – Main” configuration in walk-in enclosure. Each switched way should have an engraved label indicating the way number. If the switchgear consists of more than one section, the labels shall also include the section and the way number (example: S3/WAY1)

2. Option 2: Unit substation with fused load-breaking switches connected to transformers. In outdoor installations use fluid insulated vacuum fault interrupter (VFI) type transformer with built-in differential protection.

G. Medium voltage switchgear in “Main – Normally Open Tie – Normally Closed Tie – Main” configuration shall allow parallel operations to perform through close transition switching from one source to another. Provide transformer differential relays for medium voltage transformers larger than 750 kVA.

H. Provide power SCADA for remote monitoring and alarm of switchgears (breakers), power transformers (temperature alarms, pressure alarms, etc), transfer switches, standby engine-generators, UPS, and battery chargers. Include conduit and wire size and rating between enclosures into design.

I. Indoor medium voltage transformers shall be dry type and cast coil with built-in voltage surge protection (varistors). Transformers must be vehicle accessible.

J. Medium voltage transformers located outdoor shall be fluid insulated type with secondary containment. Medium voltage fluid insulated transformers rated 750kVA and more shall be VFI type with built in differential protection. Differential zone shall be line side of primary side protective device and load size of secondary side protective device.

Power transformers shall be temperature controllers for fan control, winding temperature, and remote alarms. Power transformers shall be specified with accessible gauges, indicators, fill and drain valves.

K. Medium voltage transformers less 1000KVA shall have enclosed breakers with ALSIG trip unit at the secondary of transformers. Breakers and trip unit settings shall be accessible without exposure to voltage for personnel.

L. Use base kVA for design criteria of dry-type and fluid insulated medium voltage transformers. The design engineer must specify the cooling class as AN or AF for dry transformers, ONAN or ONAF for oil-insulated transformers. Do not specify class OFAF or OFOD for oil-insulated transformers.

M. In installations subjected to high level of harmonics provide a power study of harmonic contribution and propose solution for mitigation. Refer to IEEE 519 Standard.

5.3 Underground Duct Systems

A. Provide detailed design for all manhole penetrations required as part of design package, Non-engineered installations are not acceptable. Verify the existing condition

Document Number: SLAC-I-720-0A26E-001-R000 Page 6 of 27 of each manhole identified for modification by the design. Engage certified services for the site investigations of electrical manholes associated with design activities.

B. Based on site master plan, duct systems for power and communications shall be laid out with sufficient quantities of conduits to serve the planned facility, with the minimum of two spare conduits for power and communication with pull rope, in each vacant conduit.

C. Ducts for site communication shall be 4 in. diameter between utility vaults (manholes).

D. Ducts for power systems shall be 5 in diameter.

E. Manholes for communication and power systems shall be of adequate size to permit personnel to walk around and work within. They are to be complete with cable tray and racks, pulling hardware on each wall and bottom, end bells, weather sealing, bolt down traffic rated covers, and grounding. Communications manholes shall have an inner steel lid with lift handle and contact limit switch for alarm. Cover size to be a minimum of 42

in. for all manholes. Pull box for smaller content is acceptable with hinged lift lids. Lid rating to match application if in vehicle traffic area.

5.4 SLAC Low Voltage Power Distribution

A. New low voltage switchgear shall be “Main – Normally Open Tie – Normally Closed Tie

– Main” configuration using 100% rated, draw-out type adjustable LSIG power breakers.

Low voltage switchgear in “Main – Normally Open Tie – Normally Closed Tie – Main” configuration shall allow parallel operations to perform close transition switching from one source to another. Provide automatic transfer only where it is specified by SLAC Electrical Engineer.

B. New outdoor switchgear, MCC, switchboards, IPC and distribution panels shall be provided with spare conduits terminated into an in-grade pull box or vault for future use.

Provide minimum one spare conduit of each diameter used in this equipment. Provide spares from each bus for switchgear.

C. In areas of corrosive environment, electrical equipment enclosures shall be stainless steel type. Exposed conduits located in corrosive environment shall be reinforced thermosetting resin conduit (fiberglass) type, including conduit supports, and strut supports. Typical corrosive environment locations are cooling towers, chiller plants, chemical hutches, and areas where corrosive materials are stored.

D. Provide equipment rated minimum of 65kAIC for low voltage panels and disconnects.

There are exceptions for sub panels (225A or smaller) with short circuit calculations validating lower AIC rating, but not less 22kAIC shall be acceptable. Switchboard construction shall be utilized for electrical distribution of 400A or greater.

E. All indoor and outdoor transformers shall be installed on housekeeping pads. In case of installation on raised floor transformers shall be provided with welded mounting stand designed by California Licensed Structural Engineer.

F. All distribution dry transformers shall use copper windings. The transformers shall be specified with impedances not less 3.2%.

G. Panelboard shall be door-n-door type. All panelboards shall use copper buses for phases and neutral. Ground busses shall be nickel-clad aluminum approved for both Al and Cu terminations. Fully rated circuit breakers shall be specified. Series connected rating shall not be used.

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H. Do not specify transformers larger than 112.5 kVA for 208/120V lighting and receptacle loads. Provide written justification to SLAC Electrical Engineer if project design requires transformers larger than 112.5 kVA. If larger size of transformer is needed due to connected distribution panel or available space limitation, transformer shall be provided with built-in secondary circuit breaker with stored energy remote operator.

I. All low voltage breakers 100A or larger shall use adjustable LSIG type breakers. For low voltage breakers fed from transformers larger than 112.5kVA, use LSIG breakers.

J. Power lighting panelboard to serve building lighting loads shall have minimum capacity of the installed load plus 25% spare capacity or 1.5 watts per square foot of area served (whichever is greater).

K. An emergency lighting inverters to serve building egress lighting loads shall have minimum capacity of the installed load plus 25% spare capacity or 0.2 watts per square foot of area served (whichever is greater).

L. Lighting control panel with a minimum relay shall have capacity equal to the required number of relays based on the lighting plan, plus 25% spare relays, plus 25% spare relay space.

M. K-7 rated, high efficiency, step down transformer and distribution panelboards with oversized neutral (200%), transformer shall be specified to serve the building receptacle loads with a minimum capacity of the installed load plus 25% spare capacity or 3.5 watts per square foot of area served (whichever is greater).

5.5 Conduit and Wire

A. Minimum conduit size is 3/4 in. SLAC allows no more than three 90-degree conduit turns (270-degree maximum). If conduit needs more than three turns the design shall specify installation of pull boxes or conduit bodies.

B. All conduits routed in finished spaces shall be concealed except in mechanical and electrical rooms.

C. Galvanized rigid steel conduit (RMC) shall be used in outdoor installations, substation buildings, all locations where it could be subjected to mechanical damage. The RMC could be also used in concrete slabs and below grade.

D. Electrical metallic tubing (EMT) shall be used in areas where it would not be subjected to mechanical damage. Such installation shall include hung ceilings and non-masonry walls. Refer to Specification Section 260533 for additional requirements.

E. Provide PVC Schedule 40 for concrete encased duct bank. PVC Schedule 80 direct buried shall be used for electrical and telephone service conduits run underground.

PVC Schedule 80 shall be used for outdoorsite lighting.

F. Reinforced thermosetting resin conduit (fiberglass) conduits shall be used in areas where raceways are subjected to corrosion. Standard wall (SW) conduit shall be used only where such conduits are mechanically protected. Medium wall (MW) fiberglass conduit shall be used in areas with no vehicular traffic. In areas were conduit potentially could be mechanically impacted use heavy wall (HW) or extra heavy wall (XW) fiberglass conduits.

G. Flexible metal conduit shall be used to connect unit heaters, motors, transformers (where conduit are routed above ground), and other type of vibrating equipment.

Liquid-tight flexible steel conduit will be used in damp and wet locations.

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H. For building power 600V and below use THHN in dry locations and THWN-2 in wet locations. For conductors to be run on the roofs and other locations where they would be subjected to heat, specify XHHN for dry locations and XHHW-2 or XHWN-2 for wet locations. For wiring in control cabinets, racks, panels and boxes use SIS multistring wiring. Conductor sizes shall be 12 AWG minimum for power and 14AWG for controls.

I. Provide separate pull boxes or vaults for signal and power wiring. Branch circuits may be fed from busways or panels as is appropriate. Each separately switched pole of a branch circuit shall have a dedicated color striped neutral wire.

J. All busways, wireways, and pullboxes shall be accessible. Do not locate where mechanical piping, ducting, cable tray, and racks block and inhibite accessibility.

K. Conduit color coding shall be used to identify the different systems in ceilings, walls, etc.

5.6 Wiring Devices Limit connection points/terminal blocks

A. The use of terminal blocks or power distribution blocks in junction boxes or wireways is not allowed.

B. 120V, 20A duplex receptacles shall be provided in aisles and corridors at 50 ft. intervals (minimum), for housekeeping purposes. SLAC requires all general purpose receptacles to be GFCI.

C. Convenience outlets located outdoor or in below grade areas, such as tunnels and basements shall be GFCI type.

D. Wherever is possible the GFCI protection shall be provided in the receptacles. The use of panelboard mounted GFCI breakers should be minimized.

E. Wiring devices on speciality circuits should match conduit and use. Ie: orange conduit use orange faceplate plugs as these are generator type curcuits.

5.7 Grounding

A. Provide a ground wire looped around electrical yards, electrical equipment pads, and substation buildings with at least one test well. Electrical yard fence shall be bonded and grounded to ground loop. Maximum resistance from any part of a building to the ground grid shall be 5 ohms or less, unless directed otherwise and approved in writing.

Single point ground system may be required in a portion of the building as directed by SLAC Electrical Engineer.

B. Provide bonding of mechanical equipment and enclosures including storage tanks.

C. The installation of isolated ground is not recommended. All grounds shall be bonded together. Raised floor pedestals for non-computer room applications shall be bonded to building steel, at two locations within the room when a bolted stringer raised floor system is utilized. Contact SLAC Electrical Engineer when other types raised floor systems are planned. Refer to article on Computer Room Power in this specification for computer room raised floor bonding.

D. A green insulation or bare copper ground conductor is required in all raceways. Conduit or cable tray is not to be relied upon as the ground path.

5.8 Cable Tray, Basket Cable Tray

A. Cable Tray shall be ladder type for all sizes.

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1. Cable Tray shall be bonded/ grounded the entire length with # 4/0 bare ground wire in accelerator directed areas. Minimum #8 for all non power areas.

2. Basket Tray is not allowed.

5.9 Electrical Rooms

A. Secondary electrical rooms shall be located on each level of the building. Provide a minimum of one electrical room per level served, located central to the area. Electrical rooms shall be vertically stacked. Additional electrical closets shall be provided if required based on distribution equipment quantities and electrical room size limitations.

B. Do not locate electrical equipment in open office spaces, conference rooms, private offices, bathrooms, janitor closet. Installation in building hallways or other common use rooms shall be done only per SLAC engineering approval. Electrical equipment shall have the means to be removed or replaced without disassembling building materials.

Do not locate switchgear in mezzanine space without means of removing equipment for maintenance.

C. Provide minimum of 25% of free wall space in new electrical rooms. All electrical rooms on ground floor shall have exterior door entrance with card reader. Provide convenience receptacles inside electrical rooms from emergency source where designed.

D. Electrical Room Telephone System And Security

1. Provide telephone/data drop in electrical rooms.

2. The electrical room telephone system shall be extended from the site interface point to a central telephone room via an underground duct system. Distribution to site buildings shall be made from the central telephone room via underground communication ducts.

3. Each building shall have at least one main telephone room into which the distribution cable is run and from which the building’s telephones are served.

4. Provide card readers for access to electrical rooms.

5.10 SLAC Power For Mechanical Loads

A. Motor Control Centers (MCC) shall be used where a group of motors is located Variable Frequency Drives (VFD) shall not be located within the MCC.

B. All mechanical loads, 3/4hp or larger shall be 480/277V.

C. Heavy duty, horsepower rated, load break rated, non-fused disconnect switch located adjacent to the motor, must be used as motor disconnecting means.

D. Where Variable Frequency Drives (VFD) shall be protected from transients of a magnitude of 6,000VAC Transient suppression devices shall be UL listed.

E. Control voltage shall not exceed 120 VAC.

5.11 Distribution of Loads

A. Disaggregation of loads shall be provided for each type of loads Loads such as mechanical, lighting, process, experimental, receptacles, standby and emergency shall be grouped into switchboards, IPC, MCC, or panelboards.

5.12 Emergency And Standby Power

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A. Standby and or emergency loads shall be grouped into panel(s) feed from either bus of 480V switchgear via transfer switch.

B. Provide diesel generator with automatic transfer switch for loads identified for standby and/or emergency systems. In addition, engage with building users or stakeholders to determine critical loads such as laboratory equipment or experimental equipment, including cooling loads for laboratory spaces. In addition, critical loads that cannot tolerate momentary interruption of power shall be provided with uninterruptable power supplies. Size for additional 35% spare capacity for future growth. Provide UPS for controls and other loads requiring uninterruptable electrical power. Obtain signed document from SLAC Project Manager, electrical SME, and electrical safety officer indicating no generator were required for new program or facility.

1. The type and size of the UPS shall be specified based on the application and availability of alternative source of power.

2. Engage with building or system users to determine if experimental or computing equipment is sensitive to power harmonics. If needed monitor power quality or request data if available. High level of harmonics shall be mitigated by use of harmonic cancelling transformers, passive and active harmonic filters.

3. For large concentrated critical loads (60kVA and more) double-conversion cabinet mounted static UPS shall be provided. UPS shall be built per UL 1778.

4. For medium size distributed critical loads (6 kVA – 60kVA) rack-mounted modular type double conversion UPS shall be provided.

5. For small loads (5kVA and less) a standby rack-mounted or tower-type UPS shall be provided.

6. Use of rotary or flywheel system shall be justified and approved by SLAC Electrical Engineer and SLAC Electrical Safety Officer.

C. The following loads shall be segregated as follows:

1. Emergency Power:

a. Fire Pump (if provided for building)

b. Egress path lighting and exit signs

2. Night lighting

3. Fire alarm, Fire Shutter Systems and life safety systems

4. Smoke evacuation fans (if applicable)

5. ODH/ODM panels and devices

6. Laser Safety controls

7. PPS controls

D. Standby Power (applicable only for a standby system):

1. Receptacles and lighting in electrical, telecom and security rooms

2. Select receptacles as directed by SLAC

3. Lighting inverters

4. Select lighting as directed by SLAC

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5. User or experimental equipment which cannot tolerate outages

6. PLC panels

7. Substation battery charger and switchgear controls

8. IT room mechanical cooling equipment

9. 120VAC dedicated power to standby generator controls

10. Service / Freight Elevator

11. Controls for HVAC equipment

12. Telecom closet (IDF Room)

13. Security system

14. Temperature control panels (pneumatic air or DDC) control system

15. Sump pumps, lift stations, sewage ejectors, etc.

E. Power to emergency systems shall be provided in each building by one or more lighting inverters.

F. Prior to the detailed design of the emergency power system, the Design Engineer shall evaluate possible locations where the emergency powered lights, exit signs, and lighting inverters can be installed. Emergency power distribution system shall be independent of regular building system. The electrical supply to the emergency lights powered from lighting inverters shall be classified as "Emergency Systems" and must be designed and installed in compliance with NFPA 70 [NEC], Article 700. This includes:

1. Certain equipment must be listed per UL 924 [NEC Articles 700.5, 700.8, 700.10(B), 700.23 and 700.24]

2. Emergency circuit wiring must be independent of all other wiring and equipment per NEC 700.10(B)

3. Ground fault protection or indication as required per NEC 700.27

4. Selective Coordination per NEC 700.28 is required

G. Legally required and optional standby power shall be provided in each building by engine-generators with base-mounted fuel tank rated to provide runtime per project requirements, but not less than eight (8) continuous hours at 75-percent of connected load. Prior to the detailed design of the standby power system, the Design Engineer shall evaluate possible locations where the engine-generator can be installed. Listed below are major factors entering into determination of where the engine-generator can be located to best advantage:

5.13 Generators

A. Follow NFPA 37 for the minimum fire safety requirements for the installation and operation of permanently installed engines including stationary, engine-generators.

Generator voltage shall be 480/277 V, 3-phase, 4-wire. An automatic transfer switch shall be provided.

B. The engine-generator set shall be built in a noise attenuating enclosure.

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C. Exhaust fumes must be discharged where they cannot create a hazardous condition.

Exhaust fumes from generator shall be downwind from building fresh air intakes to eliminate fumes ingested by HVAC during generator test operation.

D. The engine-generator and controls require periodic maintenance and should be located in an accessible area, taking into account how the generator set will be moved into place initially, as well as possible future removal for repair or replacement. Air supply for cooling and combustion is required.

E. Generator set should be located to minimize the transmission of vibration and noise to building by the engine to the adjacent structure. Aesthetic impact of the generator set placement must be considered.

F. Main fuel tank location is important as to the lengths of piping involved and ease of fuel delivery.

G. Engine generator shall be sized to approximately 130% of designed load. Specialized loads may require a dedicated emergency power system that is independent of the regular building system. SLAC Electrical Engineer will identify this need when required.

H. Automatic transfer switches (ATS) with integral isolation bypass shall be provided as required. Bypass switching and closed transition (make-before-break) arrangement shall be considered and have the concurrence of SLAC Electrical Engineer.

I. Transfer switch shall be installed in location accessible for service. Location should be selected to result in least possible interference with existing utilities.

J. The cost of necessary conduit runs from the transfer switch to the generator set, normal supply and load are important factors in selection of switch location.

K. Power status, ATS position contact and fuel tank monitoring shall connected into the Facilities Maintenance Alarm System and a local fuel level and spill alarm panel.

Provide data cable to ATS and Generator control panel.

L. Standby power distribution system shall be independent of regular building system.

M. Submit preliminary design and back up information for SLAC EH&E Department to initiate permits with the BAAQMD.

N. Provide quick connect generator docking station (QCDS) or MTS with cam-lock connection to feed low voltage switchgears, switchboards and panels with mission essential loads. QCDS or MTS with cam-lock connection shall be key interlocked with secondary main breaker. Locate MTS generator connection box outdoor. Loads deemed critical are such as fire life safety loads (fire alarm panels, duct detectors, smoke dampers), emergency lights, ODM panels, lift stations, sump pumps, security panels, network switches, mechanical control panels, and PLCs) shall be provided with battery backup.

5.14 Battery Storage Systems

A. Battery storage system shall be a prefabricated large-scale energy storage system, tailored for SLAC power distribution with primary purpose to be used with photovoltaic systems. It shall consist of multiple sets of standard energy-intensive battery clusters and equipped with fire protection and electrical units that comply with applicable codes and standards. An environmental control system shall set up inside the container to extend the service life of the battery system. The battery storage system shall be designed with the following features:

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1. Support operation of mission critical system during power outages

2. Have high-rate discharge capability and stable discharge curves;

3. Built as fully integrated system to ensure the stable and reliable operation of the equipment;

4. Provide active/passive balancing;

5. Adopt a modular design that is easy to update, expand and maintain, reducing the time needed for maintenance;

6. Built with SCADA enabled control and monitoring system.

5.15 Lighting

A. Lighting System:

1. All indoor and outdoor lighting circuits shall be fed from 120/208V panelboards.

2. Provide lighting inverter for emergency lights including exit sign lights. Provide Ethernet communication card with data cable drop. Locate in electrical room wherever is practical. Inverters should be standard equipment on all new building and building renovation projects.

3. Parking lot lighting will be accomplished through the use of pole mounted luminaires (25-ft maximum poles) with LED luminaires.

4. Add 120v, 20A and 50A, 250V outlets for new parking lot lighting and open areas used for large event areas.

5. Pedestrian scale lighting (12-ft maximum poles and/or bollards) will be used for site pathway lighting.

6. Use LED type luminaires lighting. Where remote LED drivers are located.

Indicate on plans for location.

7. All interior lighting shall be dimmable, as well as interface with occupancy and daylight sensors, to save energy.

8. High bay luminaires shall be individually fed via twisted lock receptacle to facilitate removing individual light fixture for service.

9. Location of lights shall be uniform for even light distribution. Light need to be accessible. Do not locate directly over experimental equipment, computer room server or networking rows, or large mechanical equipment.

10. Provide exterior building perimeter lights at minimum of every building entrance or exit.

B. Provide lighting at mechanical and electrical equipment pads.

Lighting Levels

The lighting levels shall be designed in accordance with the recommendations of the Illuminating Engineering Society (IES). The lighting power density shall be a minimum of 15% less than allowed by the California Energy Title 24 Code. In office spaces, lighting shall be designed using a task/ambient approach. The following lighting levels shall be provided:

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Area Maintained Lighting Level at the Workplace (foot candles)

Corridors 10

Lounges, Lobbies, Stairs, Lobby 10-20

Storage, Elevators, Toilets, Janitor’s Closet

10-20

Electrical and Telecommunication Rooms

20-30

Conference Rooms 30-50

Private Offices, Work Rooms 30-50

Open Office 30-50

Loading Dock 10-30

Parking Lot 1 minimum

Exterior plaza, walkways, pathways 1 minimum

1. Refer to IESNA Lighting Handbook Reference and Application for appropriate design standards and lighting power densities.

C. Lighting Fixtures:

1. Light fixtures shall be clearly described in a fixture schedule, including the method of hanging, and lamp type & color. Dimensioned sketches of each type of fixtures shall be provided.

2. Provide light fixture submittal to SLAC Electrical Engineer for approval.

3. Use 4000K color temperature for typical interior spaces. Use 5000K color temperature for lab spaces or areas using experimental precision equipment.

4. Use 3700K color temperature for exterior parking lot and building exterior lights.

5. Use perimeter lighting in toilet rooms on plumbing fixture walls. Sconces, downlights, and other feature lighting shall not be used as primary illumination in toilet rooms.

D. Emergency Illumination:

1. Night lighting and emergency lighting shall be one and the same and shall not be less than 4% or more than 5% of all building lighting. Battery back-up at the fixture is not required for fixtures in buildings with lighting inverters. Night light fixture circuits shall be switched from emergency panels only. Individual offices shall not be equipped with night lighting.

2. Night lighting shall be provided at all exits, major cross aisles, in toilet rooms, offices greater than 750 sq. ft., lobbies, computer, mechanical and electrical rooms and areas where large quantities of hazardous materials are used or stored.

E. Lighting Controls

Document Number: SLAC-I-720-0A26E-001-R000 Page 15 of 27

1. Exterior lighting, including site lighting shall be controlled via a lighting control panel (LCP). The LCP will include zone lighting via relays and astronomical time-clock to control the loads. In addition, provide a minimum of 25% spare relays.

2. Interior lighting shall be controlled (automatic shutoff) via occupancy sensors.

Where applicable, the building will include interior photo sensors inter-tied to the lighting fixtures for day-lighting control. All lighting devices will be capable of dimming controlled luminaires. Occupancy sensing devices shall be utilized to interface with lighting controls (in addition to mandated California Title 24 requirements) to provide maximum energy efficiency. Occupancy sensor spacing shall be in accordance with the manufacturer’s recommendations and shall provide full coverage of the area controlled.

3. High bay areas or areas with ceiling heights too high for use with occupancy sensors, use lighting control panel to schedule lights off.

4. Areas located at the perimeter of the building shall be provided with daylighting controls. Controls shall interface with lighting circuiting to provide uniform lighting levels throughout the day lit area.

5. Enclosed stairs shall include occupancy sensor controls to reduce the lighting within the stair (by a minimum of 50%) when it is not occupied.

6. Toilet rooms shall include occupancy sensor controls to turn off all the non-night light fixtures when the room is not occupied. Occupancy sensor time delays shall be set at a minimum of 30 minutes.

7. Luminaires located in the electrical room are exempt from automatic shut off controls.

8. Use sensor switches for rooms smaller than 150 sq. ft, other than electrical rooms.

9. Provide local manual override switches for interior light zones controlled by lighting control panel.

10. Occupancy Sensors:

a. Generally, light switching to be done by motion detectors, except in high bay type areas, and any area where sudden darkness poses a hazard (i.e., chemical process area, equipment rooms, laser labs, etc.).

b. Areas enclosed by ceiling high walls must be provided with motion detectors which control all light fixtures within that area.

c. Occupancy sensors in individual offices shall include wall switching to enable manual on, automatic off.

d. Occupancy Sensors guidelines:

1) Occupancy sensors shall be installed no closer than 4 ft. from air supply vents.

2) In all rooms/offices the detector should be installed as to not allow scanning through the doorway.

3) Occupancy sensors should not be installed above 12 ft mounting height.

Specialized detectors for tall aisles are to be considered.

4) Use dual technology occupancy sensors.

Document Number: SLAC-I-720-0A26E-001-R000 Page 16 of 27

5) Subtract 5% of coverage for every foot the detectors are mounted above 9 ft.

6) Subtract an additional 25% coverage if the detectors are installed in a carpeted and partitioned area.

7) Night lighting and emergency lighting shall not be switch controlled by motion detectors

8) Hallway and corridor lighting shall be switched with motion detectors.

9) The following statement is to be included with all lighting design where motion detectors are used: “Contractor shall engage the manufacturer’s representative to perform initial adjustment and tune-up of all lighting motion detectors.”

10) All light switches must be located inside the area whose lighting is being controlled. The switches must be located so that the operator can readily see the light fixtures being switched and be placed at the handle side of door openings.

11) Do not locate surface mount switches on walls of corridors where vehicular traffic is likely to occur.

11. Switches added to existing facilities employing remote control of lighting by a lighting control system shall be connected to the existing system with the exception of private offices and equipment rooms which shall have standard sensor switches or occupancy sensors. These areas shall be independent and not be zone controlled by the lighting control system.

12. New lighting control system shall use digital light management system. Design lighting control systems which is network together and centralized for the building.

Include room controllers, occupancy sensors, segment managers for each area/floor, daylight sensors, plug load controls, sensor switches, and lighting control panels. Provide Ethernet connection to lighting control system.

5.16 Power Loads Design

A. The minimum size of the main electrical service shall be the larger of the values determined using the following load calculation methods:

B. Computed in accordance with the latest National Electrical Code (NEC), Article 220 plus 25 percent future/spare capacity.

C. Computed at the total of:

1. 125% of the connected building lighting load

2. 125% of the connected site lighting load

3. General office and receptacle loads at 3.5 watts per gross square foot of building area

4. 100% of the connected mechanical and plumbing loads

5. 100% of user defined loads or experimental equipment

6. Miscellaneous loads at 1.0 watts per gross square foot of building area

7. Plus 25% of the subtotal for future/spare capacity

Document Number: SLAC-I-720-0A26E-001-R000 Page 17 of 27

D. HVAC

1. Based on system requirements as determined during initial mechanical design

E. Office Areas

1. Watt per sq. ft. office equipment target 0.90 watts per sq. ft. total power

F. Equipment Fabrication and Testing Areas

1. 25 watts per sq. ft. power (use as an early estimate before actual equipment loads are known)

G. Experimental Areas

1. SLAC Project Manager shall contact the Users to identify any special loads that will affect power requirements and contribute to heating of space.

H. Total load

1. Add a growth factor of 30% after appropriate diversity factors have been applied.

I. All design shall provide for the efficient use of energy through proper equipment selection and system control, unless otherwise noted by SLAC facilities electrical engineer.

5.17 Calculations

A. Provide demand load summary calculations for each design development and construction document submittal.

B. Provide preliminary short circuit calculation at each distribution bus. Use ETAP software for calculation and submit model to SLAC. Submit during each construction document submittal progressed more than 50%.

C. Provide Lighting intensity (foot-candle) calculations for outdoor and indoor lighting.

Submit during construction document submittal progressed more than 50%.

D. Provide voltage drop calculations for feeder and branch circuits. Submit during construction document submittal progressed more than 50%.

E. Arc flash study, including coordination study and complete short circuit study to be performed by SLAC.

F. Provide transient voltage study for medium voltage switchgear with vacuum circuit breaker installed closer than 80-ft from dry-type transformer.

G. Computer Room Power

1. Computer systems are generally located in a raised computer floor area. Power for the computers is usually derived from a clean power source (typically harmonic cancelling transformer, panels with active harmonic filter or UPS) fed by the building power system. Single point grounds are generally used as a part of this type of system.

2. Raised floor pedestals are to be grounded as a part of the computer room ground system.

3. Where power distribution wireways or busways are specified, each receptacle shall be fed by an individual circuit breaker. Identify receptacle with circuit number. When connected to a UPS power source, in addition to a circuit number, Document Number: SLAC-I-720-0A26E-001-R000 Page 18 of 27 the receptacle cover plate shall be painted gloss yellow. Avoid underfloor power whips.

4. EPO – Emergency Power Off: Circuit shall be wired such that the trigger signal shall be a contact closure to energize a previously un-energized relay. Do not use an energized relay circuit to hold open a contact. The EPO manual station shall be encased in a clear cover polycarbonate material.

5.18 Supervisory Control And Data Acquisition (SCADA)

A. A state-of-the-art power quality meter shall be provided in each main 480VAC output section of the switchgear. The meter shall function as a data logger for trending and be furnished with either or both local LCD or LED electronic registers. Meters shall be able to interconnect to each other and one meter identified for Ethernet connection, wired to the network switch. In addition provide Ethernet gateway device for serial connection of digital trip units. Refer to design requirements for additional meters monitoring of other 480VAC loads.

B. Provide data cable (max of 300 Ft) from network rack to every Ethernet port furnished with meter, lighting controller, Ethernet gateway device, and power intelligent device.

C. Provide metering and monitoring of electrical switchgears, switchboards, distributional panels, transformers, battery chargers, IPC’s, MCC’s, UPS’, ATS’s and standby generators. Metering, gateway, and monitoring devices shall be wired to Ethernet switch or patch panel. Networking provisions shall be reviewed and approved by SLAC IT Networking Group Manager.

D. Meters, Ethernet gateway devices, other power intelligent devices shall use Modbus TCP/IP protocol.

E. All medium voltage and low voltage switchgear shall include power intelligent devices.

Medium voltage breakers status (Racked-in/Racked-out/Open/Close/Trip) shall be wired to digital I/O inputs of protective relay and power quality meter for associated breaker. Power transformers with temperature alarms and sudden pressure alarms/trips shall be wired to primary side protective relay device. Medium voltage switches shall be wired to monitoring gateway device for switch status (open/close).

1. All protective relays and medium voltage control devices with Ethernet port shall be connected via data cabling to a local managed networked switch with fiber connections from nearest network rack.

2. GPS clock shall be provided in each new substation.

3. A raceway between meters in or around the double ended substation shall be provided. Communication between the meter and the master station shall be via standard Cat 6 Ethernet cables. All meter interconnections shall be identified and described in a design plan (sub-station single line). Electrical power plan shall illustrate conduit and wire routing for meter.

F. Connect the following minimum list of electrical equipment to SCADA. Provide data cable and conduit

1. Generators control panels.

2. Automatic transfer switches.

3. Substation battery chargers.

Document Number: SLAC-I-720-0A26E-001-R000 Page 19 of 27

4. Lighting Inverters.

5. PDU

6. UPS

7. Transformer temperature control panels.

8. Power metering equipment

9. Switchgear gateway devices.

6 Design Submittals

The following submittals are catergorzied as “conceptual design,” “preliminary design,” and “construction documents” for each respective phase of the project. If project does not include conceptual or preliminary design submittals, then requirements shall carry over to construction document submittals.

6.1 Conceptual Design

A. The scope of pre-design services shall depend on the size and complexity of the project and the amount of information that has been provided by SLAC in the Statement of Work (SOW).

B. Verify that layouts and design solutions suggested by SLAC will accommodate the proposed functions and that they are in compliance with applicable codes and Design Standards.

C. Determine what upgrades to existing facilities and utility systems will be needed to meet code and reliably support proposed uses.

D. Perform conceptual design services to include:

E. Validate stated functional requirements. Provide or complete the program of spaces, listing the function, size, occupant count, utilities, equipment and other features of each space.

F. Compile information and perform field investigation to provide a complete list of equipment as needed, including voltage, phase, current/watt loading, NEMA plug configuration/hard wire connection required, NRTL certification requirements and other features. SLAC may provide a complete or partial list of equipment, which shall be verified and completed by the designer.

G. Determine utility, floor loading and other requirements to accommodate equipment and functions.

H. Determine phasing of the design and construction to support need dates and minimize disruption in occupied facilities.

I. Identify Hazardous or Regulated Materials, their use, quantities and storage locations and impact to building…