26 24 00 SWITCHBOARDS AND PANELBOARDS

26 24 13 Switchboards

.01 General

1. Refer to Service Entrance Equipment in 26 20 00 for additional requirements.
2. Circuit breakers for lab facilities or of capacity 1,600 amperes and greater (and as required by Engineering Services for maintenance purposes) shall be of the low voltage power circuit breaker type, draw-out, with "Engaged," "Test", and "Disengaged" positions, to meet UL1066.  Racking shall be accomplished with cell door closed and latched.  Provide draw-out cell with protective shutter for personnel protection when breaker is racked out.  Provide pad-locking provisions and primary contacts that are field replaceable.  Breakers shall have visual trip indicators.  Coordinate feeder breaker types with Engineering Services.
3. Provide at least one (1) spare breaker in each frame size and at least 10% fully provisioned space capacity.

.02 Guide Specifications

1. Design Professional shall carefully review and edit the guideline specifications below, adapting them as needed to achieve application-specific, fully developed specifications for each project.
2. These shall be edited using the process described in the instructions contained at the beginning of the document.  Proposed modifications shall be reviewed with OPP Engineering Services.
3. Finalized version shall be included in the project contract documents.  Use of other specifications is not acceptable.

26 24 16 Panelboards

.01 General

1. Refer to Service Entrance Equipment in 26 20 00 for additional requirements.
2. Allow 20% spare and another 10% fully provisioned space capacity for future breakers.  Critical operations, shops and research facilities may require 50 percent spare capacity, consult with Engineering Services.
3. Distribution Panels
1. Consider second level of SPD, especially if panel feeds sensitive or critical loads or has branch circuits running outside of the building footprint (site lighting, etc.).
2. When ground fault is provided on the service entrance equipment, specify ground fault sensing and shunt-trip for breaker(s) feeding site lighting panel(s). Coordinate setting of ground fault to limit nuisance tripping, but also prevent any overtrip.
4. Branch-Circuit Panels
1. Panelboards serving dedicated computer loads shall be reviewed for 200% neutral bus and feeder application with Engineering Services.
2. Circuits feeding exterior lighting shall utilize the 3-letter labeling scheme as directed by Engineering Services.
3. Panelboard Installation:
1. Panels serving loads in only one room may be located in that room.
2. Panels serving more than one room shall be located in an electrical closet, corridor, or other accessible space.
3. Do not install panelboards in janitor closets or dedicated telecom rooms.
5. Lab Panels – limit available short-circuit current to under 10,000 AIC, this does not supersede the requirements outlined in other sections of the standards. Discuss current-limiting solution with Engineering Services.  Provide main breaker, door with lock, and tamperproof screws.

.02 Guide Specifications

1. Design Professional shall carefully review and edit the guideline specifications below, adapting them as needed to achieve application-specific, fully developed specifications for each project.
2. These shall be edited using the process described in the instructions contained at the beginning of the document.  Proposed modifications shall be reviewed with OPP Engineering Services.
3. Finalized version shall be included in the project contract documents.  Use of other specifications is not acceptable.

26 24 19 Motor-Control Centers

.01 General

1. Motor Control Centers
1. Structures shall be totally enclosed, dead front, free standing.  Provide guide rails for control units, accessible wireways and terminal blocks for control wiring.  Individual buckets must be of the draw-out design capable of safe removal (with door shut and latched) without de-energizing the common bus, to permit compliance with latest edition of NFPA 70E.  Provide product similar to Eaton/Cutler-Hammer I.T. FlashGard.
2. Each starter shall have two normally open and two normally closed auxiliary contacts wired to the terminal blocks, hand, off, auto switch, green run light, red off light.  All indicating lamps shall be LED.
3. Starters shall be wired so that upon loss of electrical power, they revert back to automatic operation when power is restored.
4. The motor control center shall be sized for a minimum 25 percent spare capacity, minimum 1 bucket space per upright.  Size spaces to accommodate, at minimum, one (1) each of the largest starters provided.  It shall be complete with buss bar, rails, wireways and other appurtenances so that other than new starters, no additional hardware is required for future expansion.
5. All internal control wiring to terminate at screwed terminal strips, properly identified for connecting field control wiring.