Boulder Valley School District
Centaurus High School – Phase 1: Site and Athletic Improvements
Project Number 10203-000
gkkworks
SECTION 26 24 13
SWITCHBOARDS
PART 1 - GENERAL
1.01
SUMMARY
A.
1.02
1.03
Provide switchboards in accordance with the Drawings and Specifications.
SUBMITTALS
A.
Product Data: For switchboard and overcurrent protection device types and necessary
accessories.
B.
Shop Drawings: For each switchboard, include:
1.
One-line diagram and schedules indicating individual components and ratings. As a
minimum, include ampere, voltage, phase, and AIC ratings.
2.
Plans and elevations indicating dimensions, conduit entrance sizes and locations,
arrangement of overcurrent protection, frame sizes of overcurrent protection, and
installation details including mounting.
3.
Scaled plans and elevations for installed space of switchboard indicating clearances
and service space relative to adjacent surfaces.
QUALITY ASSURANCE
A.
Switchboards and panelboards throughout the project shall be of the same manufacturer.
PART 2 - PRODUCTS
2.01
ACCEPTABLE MANUFACTURERS
A.
B.
C.
D.
2.02
Cutler- Hammer/Eaton Corp
General Electric
Siemens Energy & Automation
Square D
GENERAL
A.
Switchboard AIC ratings as indicated or required are established by the lowest rated
component of the switchboard. Series rating is not permitted unless otherwise noted.
Switchboards shall be certified by the manufacturer as having been tested as a complete
unit under fault conditions to withstand the AIC rating indicated or required. Standard tests
per UL standards.
B.
Switchboards shall have 100 percent rated plated copper buses for each phase and neutral.
Provide 50 percent rated copper ground bus. Switchboards shall be suitable for use as
service equipment where indicated. Through buses shall run horizontally at the rear of each
section with the buses stacked edge-to-edge. Unused spaces shall have busing for future
SWITCHBOARDS
26 24 13 - 1
Boulder Valley School District
Centaurus High School – Phase 1: Site and Athletic Improvements
Project Number 10203-000
gkkworks
use, unless otherwise noted.
C.
Switchboards shall be free standing, totally enclosed, dead front with only front accessibility
required. The framework is to be code gauge steel, rigidly welded and bolted together to
support all cover plates and component devices during shipment and installation.
D.
Nameplate information shall include catalog number or factory order number, date of
manufacturing, UL Listed label, ampere, voltage, phase, and AIC ratings.
E.
The switchboard shall be provided with adequate lifting means and shall be capable of being
rolled or moved into installation position.
F.
Enclosures shall be NEMA 1 type unless NEMA types 3R, 3S, 5, and 12 are indicated or
required. Enclosures shall have ANSI 49 gray enamel electrodeposited over cleaned
phosphatized steel.
G.
A utility metering compartment for instrument transformers as indicated or required in the
service entrance section of a switchboard shall be coordinated with the Utility Company for
requirements and provided accordingly.
H.
Switchboard Main Disconnect(s)
I.
2.03
1.
Fusible Switch(s): Fixed mounted type with ratings as shown on the Drawings.
Equip with ground fault protection as indicated or required.
2.
Circuit Breaker(s): Fixed mounted molded case electronic trip type with ratings as
shown on the Drawings. A means to padlock in the OFF position shall be provided.
Equip with ground fault protection as indicated or required.
Distribution Section
1.
Fusible Switch(s): Fixed mounted type with ratings as indicated on the Drawings.
Equip with ground fault protection as indicated or required.
2.
Circuit Breaker(s): Fixed mounted molded case thermal magnetic type with ratings
as indicated on the Drawings. A means to padlock in the OFF position shall be
provided. Equip with ground fault protection as indicated or required.
FUSIBLE SWITCHES
A.
Switches shall be quick-make quick-break type and have dual mechanical cover interlocks
to prevent the opening of the cover when the switch is in the ON position. The cover
interlock shall also prevent the switch from being turned ON with the cover open. A manual
interlock override shall be provided for testing purposes. Switch cover shall include a hasp
by which the cover can be padlocked in the closed position. The operating handle shall
have lock-off means with provisions for three padlocks.
B.
There shall be two forms of visible ON/OFF indication: A dual-color operating handle and an
ON/OFF nameplate with international markings. The universal nameplate shall be readable
regardless of the switch orientation. Each nameplate shall furnish an easily removable
circuit directory card.
C.
Switches shall have standard and maximum horsepower ratings.
SWITCHBOARDS
26 24 13 - 2
Boulder Valley School District
Centaurus High School – Phase 1: Site and Athletic Improvements
Project Number 10203-000
D.
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Equip with fuse rejection clips as applicable. Provide UL Listed field installable blown fuse
indicator and electrical interlock accessories as indicated or required.
PART 3 - EXECUTION
3.01
GENERAL
A.
Prior to energizing, retighten all field connections to manufacturer's torque specifications,
check that all grounding connections are proper, exercise all devices to make certain that
they operate properly.
B.
Provide facilities for future connection of additional secondary loads. Two 3 inch spare
conduits shall be stubbed out above ceiling or run to an accessible location.
C.
Main and branch disconnects shall be clearly identified as to service, frame size, circuit
breaker trip setting or fuse size and type.
END OF SECTION
SWITCHBOARDS
26 24 13 - 3