ESBD_492828_1777911210404_ADDENDUM #3 SPECS.pdf

41406 Southwest TX College - LaForge Hall HVAC Renov 26 24 13 - 1 Switchboards - Circuit Breaker

Type

SECTION 26 24 13

SWITCHBOARDS - CIRCUIT BREAKER TYPE

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Switchboards.

B. Engineering Studies/Reports.

1.2 RELATED REQUIREMENTS

A. Section 26 05 00 - Common Work Results for Electrical.

B. Section 26 05 53 - Identification for Electrical Systems.

C. Section 26 08 00 - Commissioning of Electrical Systems.

1.3 REFERENCE STANDARDS

A. ANSI/NEMA AB 3 - Molded Case Circuit Breakers and Their Application; Current

Edition, Including All Revisions.

B. NECA 400 - Standard for Installing and Maintaining Switchboards; 2007.

C. NEMA PB 2 - Deadfront Distribution Switchboards; 2011.

D. NEMA PB 2.1 - General Instructions for Proper Handling, Installation, Operation, and

Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or Less; 2013.

E. NEMA PB 2.2 - Application Guide for Ground Fault Protective Devices for Equipment;

Current Edition, Including All Revisions.

F. UL 50 - Enclosures for Electrical Equipment, Non-Environmental Considerations;

Current Edition, Including All Revisions.

G. UL 489 - Molded-Case Circuit Breakers, Molded-Case Switches and Circuit Breaker

Enclosures; Current Edition, Including All Revisions.

H. UL 891 - Switchboards; Current Edition, Including All Revisions.

1.4 SUBMITTALS

A. See Section 26 05 00.

B. Product Data:

1. Enclosure and busing.

2. Circuit breakers.

3. Metering equipment.

C. Shop Drawings:

1. Per Section 26 05 00.

2. Dimensioned drawings:

a. Top and bottom views showing entry and exit space for raceways.

b. Front and side elevations showing arrangement of devices.

3. Busing arrangement, including material type and capacity of buses and short circuit ampere interrupting rating.

4. One- or three-line diagram, including information on circuit breakers including type, ratings, short circuit and settings of trips.

D. Test Reports: Per Section 26 08 00.

E. Contract Closeout Submittals:

1. Per Section 26 05 00.

2. Operation and Maintenance Data:

a. NEMA PB 2.1.

b. NEMA PB 2.2.

c. As-built shop drawings.

LaForge Hall HVAC Renov 26 24 13 - 2 Switchboards - Circuit Breaker

Type

1.5 QUALITY ASSURANCE

A. See Section 26 05 00.

1.6 DELIVERY, STORAGE AND HANDLING

A. See Section 26 05 00.

B. Packing and Shipping: Deliver switchboards in suitable containers or packing material.

C. Acceptance at Site: Inspect switchboards for damage to product and finishes.

D. Storage and Protection:

1. Store in clean dry environment.

2. Store products minimum of 1-1/2" above floor.

3. Protect from dust, dirt and foreign objects.

1.7 WARRANTY

A. See Section 26 05 00.

PART 2 PRODUCTS

2.1 MANUFACTURERS

A. Eaton Pow-R-Line C with main breaker having Digitrip RMS 520M trip unit.

B. GE by ABB ReliaGear Series with main breaker having Entelliguard trip unit.

C. Siemens Energy & Automation SB Series with main breaker having Sensitrip III trip unit.

D. Square D QED Series with main breaker having Micrologic 6.0A trip unit.

2.2 MANUFACTURED UNITS

A. Conform to NEMA PB 2 and UL 891.

B. Voltage and Configuration:

1. 250 volts maximum.

2. 3-phase 4-wire.

C. Amperage: 1600 amps or higher.

D. Short Circuit Interrupting Rating: Minimum 65,000 amps or as indicated on Drawings.

2.3 COMPONENTS

A. Enclosure:

1. Conform to UL 50.

2. Painted sheet steel.

3. Aligned front and rear.

4. Deadfront construction with group-mounted circuit breakers.

5. With manufacturer’s nameplate.

6. Type:

a. NEMA 1 indoors.

b. NEMA 3R non-walk-in outdoors.

B. Busing:

1. Plated copper.

2. Fully-rated phase bus, horizontal and vertical.

3. Fully-rated neutral bus, horizontal and vertical.

4. Equipment ground bus bonded to enclosure.

5. Isolated/insulated ground bus where indicated on Drawings.

6. Provisions for extension of buses.

7. Spaces with hardware required to accept future circuit breakers (minimum 25% space).

C. Circuit Breakers:

LaForge Hall HVAC Renov 26 24 13 - 3 Switchboards - Circuit Breaker

Type

1. General:

a. Conform to ANSI/NEMA AB 3 and UL 489.

b. Molded or insulated case.

c. Fully-rated, not series-rated.

d. Quick-make quick-break.

e. Manually operated.

f. 75°C lugs.

g. Shunt-trip module and 120V control power transformer when EPO switch indicated on Drawings.

2. Breakers rated 100 amps and smaller: Thermal-magnetic trip.

3. Breakers rated 110 amps through 350 amps:

a. Thermal-magnetic trip.

b. Single magnetic trip adjustment.

4. Breakers rated 400 amps through 800 amps:

a. Thermal-magnetic or solid-state trip.

b. Single magnetic trip adjustment on thermal magnetic trip or LSI functions on solid state trip.

c. 80% rated unless otherwise indicated on Drawings.

D. Main Circuit Breaker(s):

1. Solid-state trip with LSI functions and digital ammeter.

2. Bolted to bus.

E. Branch Circuit Breakers:

1. Bolted to or plugged on bus.

F. Meter:

1. Solid-state digital multi-function capable of displaying following values:

a. Voltage L-L and L-N.

b. Current in each phase.

c. Power factor.

d. Frequency.

e. kVA.

f. kW.

g. Max/Min kVA.

h. Max/Min Kw.

2. Output consisting of BACnet or Modbus protocol.

PART 3 EXECUTION

3.1 INSTALLATION

A. Install and connect:

1. Per manufacturer's written instructions.

2. Per NECA 400 and NEMA PB 2.1, as limited below.

3. On concrete pad per Section 26 05 00.

4. Nameplate per Section 26 05 53.

3.2 INSPECTION AND TESTING

A. See Section 26 08 00.

3.3 ADJUSTING

A. Plumb enclosures.

B. Set breakers per coordination study/report.

3.4 CLEANING

LaForge Hall HVAC Renov 26 24 13 - 4 Switchboards - Circuit Breaker

Type

A. Clean exterior and touch up paint if necessary.

B. Vacuum interior of enclosure.

END OF SECTION 26 24 13

12/08/21

04/30/2026