ILES & SPACE
SECTION 5
ELECTRICAL DESIGN STANDARDS
5.1
GENERAL
5.1.1
Correlation and Coordination
A.
This section provides standards for the Electrical design work. These design
standards shall correlate with the current edition of Lockheed Martin Missiles & Space
(LMMS) Facility Engineering Standards (FES), Construction Specifications, Volumes I
through IV, and other sections of this Facility Design Standards. Where applicable,
the Engineering Construction Details delineated in the FES Construction Specifications
shall be used for compatibility to LMMS existing facilities design.
B.
The Electrical design work shall be designated under the current Construction
Specifications Institute (CSI) format.
C.
The design shall be fully coordinated with other related architectural and engineering
disciplines to eliminate conflicts and omissions, and to ensure that the total project
requirements are met. Prudent judgment must be exercised in collaborating design
solutions with LMMS organizations and personnel.
D.
All design/construction drawings shall follow LMMS drawing procedures and standards,
unless specifically described otherwise in specific Sections of this Facility Design
Standards. Refer to Section 11, Drawing Procedures for all drawing requirements.
5.1.2
Design Philosophy
The design shall be done in a manner to assure that the maximum benefit is obtained for the
costs expended. Safety and reliability shall not be compromised as a cost saving measure.
The methods of analysis and design shall follow established principles of professional
engineering practices. Value Engineering is encouraged during the development of the
design of all systems. Life cycle cost calculations shall be part of value engineering
proposals.
5.1.3
Codes and Standards
Design work shall comply with the current adopted edition of all applicable city, 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.
California Code of Regulations Title 8 and Title 24
Local Municipal Codes
American National Standards Institute (ANSI)
American Society for Testing Materials (ASTM)
Factory Mutual Engineering Corporation (FM) FACILITY DESIGN STANDARDS
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International Electrotechnical Commission (IEC)
Institute of Electrical and Electronic Engineers (IEEE)
Illuminating Engineering Society of North America (IES)
International Power Cable Engineers Association (IPCEA)
Joint Industry Conference (JIC)
National Electric Code (NEC)
National Electrical Manufacturer Association (NEMA)
National Fire Protection Association (NFPA)
Occupational Safety and Health Administration (OSHA)
Underwriters Laboratories (UL)
International Conference of Building Officials (ICBO)
5.2
POWER
5.2.1
Incoming Power
A.
Incoming power and communication locations and requirements shall be established
with the applicable utilities companies serving the site.
B.
At LMMS Plant 1, incoming power is generally delivered at a nominal 12.47 kV. Other
voltages may be accepted based on local conditions at LMMS Plants 2 and 5. Such
acceptance shall be by the Electrical Engineering group of LMMS Facility Engineering
organization. The power company may locate a substation at the point of service.
C.
The main service point to each building is to be considered the point of service to that
building.
5.2.2
Power Distribution
A.
At LMMS Plant 1, the power is distributed at a nominal 12.47 kV from the point of
service to the various use points in the site. A lineup of vacuum circuit breakers are
used to supply the feeders. The ultimate size of this switchgear section depends upon
the master plan for the site. Space should be provided for planned switchgear
additions as well as a provision for 25% future growth.
B.
Distribution is via an underground duct system with branches into each building. A
minimum of two feeders are provided to each building. Either feeder should be
capable of supplying the buildings power requirements. Additional feeders may be
required in a building with high power demand. Typically, if three feeders were
required, two should be capable of supplying the load.
C.
A feeder may be extended into more than one building allowing it to be the normal
source for one building and the standby source for a second building.
D.
Normal power distribution within a building is at 480/277 volt, 3 phase, 4 wire obtained
from 12.47 kV primary, dry type, cast resin, double ended unit substations located in
the building.
E.
Building power distribution at 120/208 volt, 3 phase, 4 wire is obtained from
strategically located, 480 volt primary, dry type, transformers, typically 45 or 75 kVA
size. FACILITY DESIGN STANDARDS
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F.
Branch circuits may be fed from bus ducts or panels as is appropriate. Each
separately switched pole of a branch circuit is to have a separate neutral wire.
G.
For 600V building power and lighting conductors, use THHN in dry locations and
THWN in wet locations.
H.
A ground grid shall be provided for the building. Maximum resistance from any part of
a building to the ground grid shall be 5 ohms or less, unless directed otherwise. Single
point ground system may be required in a portion of the building as directed by LMMS
Electrical Engineering group.
I.
Under no circumstances is an isolated ground to be installed. All grounds shall be
bonded together.
J.
A green insulation ground conductor is required in all raceways. Conduit or cable tray
is not to be relied upon as the ground path.
K.
Control voltage shall not exceed 120 volts.
L.
As a minimum, circuit breakers shall have interrupting capacity rating equal to the
available fault current.
M.
Fully rated circuit breakers shall be used. Series connected rated circuit breakers are
not to be used.
N.
Motor Control Centers (MCC) shall be used where a group of motors are located in a
given area or for a system.
O.
Heavy duty, horsepower rated, non fused disconnect switch located adjacent to the
motor, must be used as motor disconnecting means.
P.
Minimum conduit size is 3/4 in. Use of 1/2 in. conduit is to be used only for light
switches, 120V receptacle drops, light fixtures or with LMMS Electrical Engineering
group approval.
Q.
Where Adjustable Frequency Controllers (AFC) are used for motor speed control, they
shall be protected from transients of a magnitude of 6,000 volts at the 480 volt level.
Transient suppression devices must be UL listed.
R.
120V 20A duplex receptacles shall be provided in aisles and corridors at 50 ft.
intervals, for housekeeping purposes.
5.2.3
Emergency Power
Emergency power shall be provided in each building. Each building shall have an engine
generator for this purpose. Generator voltage shall be 480/277 volt, 3 phase, 4 wire. An
automatic transfer switch shall be provided. Emergency power shall be provided for lighting,
communication, fire and security protection systems, and other loads as required.
Emergency generator shall be driven by diesel engine unless otherwise noted. Day tank
installed aboveground shall not exceed quantities outlined in the Local Municipal Codes. FACILITY DESIGN STANDARDS
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5.2.4
Design Power Loads
A.
For purposes of initial design, power loads are to be estimated as follows:
1.
Lighting
Based on levels required in various areas. Lighting is normally 277 volts. Other
voltages may be used where appropriate.
2.
HVAC
Based on system requirements as determined during initial mechanical design.
3.
Office area
1 watt per sq. ft.
4.
Manufacturing area
25 watts per sq. ft. (use as an early estimate before actual equipment loads are
known).
5.
Other
LMMS Electrical Engineering group will identify any special loads that will affect
power requirements.
6.
Total load
A growth factor of 30% should be included in all design after appropriate
diversity factors have been applied.
B.
All design shall provide for the efficient use of energy through proper equipment
selection and system control.
C.
Power, telephone and lighting panels shall not protrude into any aisle or corridor. No
panels shall be installed in fire corridors unless panels are mounted in closets with fire
rated doors.
5.2.5
Calculations
A.
Short circuit calculations shall be made for the power system. All system protective
devices shall be properly coordinated. Submittals must be made of all calculations,
time current curves, ground fault and relay settings. FACILITY DESIGN STANDARDS
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B.
Additional calculations shall be made and submitted for:
1.
Voltage drop for feeders and branch circuits
2.
Lighting intensity
3.
Demand load analysis
4.
Title 24 - Compliance documents
5.3
TELEPHONE SYSTEM
The telephone system is extended from the site interface point to a central telephone room
via an underground duct system. Distribution to site buildings is made from the central
telephone room via underground communication ducts. Each building shall have at least
one main telephone room into which the distribution cable is run and from which the
buildings telephones are served. Refer to Section 9, Telecommunications Design
Standards.
5.4
SMOKE/FIRE DETECTION SYSTEM
A.
A f