4. Supplemental Specifications.pdf

Copyright 2013 AIA MasterSpec Small Project 10/13

GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 260526 - 1

SECTION 260526 - GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

PART 1 - GENERAL

1.1 SECTION REQUIREMENTS

A. Submittals: Product Data for each type of product indicated.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

B. Comply with UL 467 for grounding and bonding materials and equipment.

2.2 GROUNDING MATERIALS

A. Conductors: Solid for No. 8 AWG and smaller; stranded for No. 6 AWG and larger unless otherwise indicated.

1. Insulated Conductors: [Copper] wire or cable insulated for 600 V unless otherwise required by applicable code or authorities having jurisdiction.

2. Bare, Solid-Copper Conductors: Comply with ASTM B 3.

3. Bare, Stranded-Copper Conductors: Comply with ASTM B 8.

B. Bolted Connectors for Conductors and Pipes: Copper or copper alloy.

C. Welded Connectors: Exothermic-welding kits of types recommended by kit manufacturer for materials being joined and installation conditions.

D. Ground Rods: Copper-clad steel, sectional type; 5/8 by 96 inches (16 by 2400 mm).

PART 3 - EXECUTION

3.1 INSTALLATION

A. Underground Grounding Conductors: TBD by loads and buried as needed IAW NEC.

B. Pipe and Equipment Grounding-Conductor Terminations: Bolted.

C. Underground Connections: secured to avoid coming apart IAW industry standards/NEC.

GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS 260526 - 2

D. Connections to Structural Steel: Bolted.

E. Install grounding conductors routed along shortest and straightest paths possible unless otherwise indicated or required by code. Avoid obstructing access or placing conductors where they may be subjected to strain, impact, or damage.

F. Install ground rods driven into ground until tops are 2 inches (50 mm) below final grade or 4 inches (100 mm) above finished floor slab unless otherwise indicated.

G. Protect ground rods passing through concrete floor with a double wrapping of pressure-sensitive insulating tape.

H. Make connections without exposing steel or damaging coating if any.

I. Install bonding straps and jumpers in locations accessible for inspection and maintenance, except where routed through short lengths of conduit.

J. Bond straps directly to basic structure, taking care not to penetrate any adjacent parts.

K. Bond to equipment mounted on vibration isolation hangers and supports so vibration is not transmitted to rigidly mounted equipment.

L. Grounding and Bonding for Piping:

1. Metal Water Service Pipe: Install insulated copper grounding conductors, in conduit, from building's main service equipment, or grounding bus, to main metal water service entrances to building. Connect grounding conductors to main metal water service pipes using a bolted clamp connector or by bolting a lug-type connector to a pipe flange, using one of the lug bolts of the flange. Where a dielectric main water fitting is installed, connect grounding conductor on street side of fitting. Bond metal grounding-conductor conduit or sleeve to conductor at each end.

2. Water Meter Piping: Use braided-type bonding jumpers to electrically bypass water meters. Connect to pipe with a bolted connector.

3. Bond each aboveground portion of gas piping system downstream from equipment shutoff valve.

M. Test completed grounding system at each location where a maximum ground-resistance level is specified, at service disconnect enclosure grounding terminal, and at ground test wells.

1. Measure ground resistance not less than two full days after last trace of precipitation and without soil being moistened by any means other than natural drainage or seepage and without chemical treatment or other artificial means of reducing natural ground resistance.

2. Perform tests by fall-of-potential method according to IEEE 81.

3. Report measured ground resistances that exceed 25 ohms.

4. Excessive Ground Resistance: If resistance to ground exceeds specified values, notify

Architect promptly and include recommendations to reduce ground resistance.

END OF SECTION 260526

PANELBOARDS 262416 - 1

SECTION 262416 - PANELBOARDS

PART 1 - GENERAL

1.1 SECTION REQUIREMENTS

A. Submittals: Product Data Sheets for a 42 breaker, 120/208V 3-phase panel that will be installed, and associated electrical components, devices, and accessories.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

B. Comply with NEMA PB 1.

C. Seismic Performance: Panelboards shall withstand the effects of earthquake motions determined according to California Seismic Standards and [ASCE/SEI 7].

2.2 GENERAL REQUIREMENTS FOR PANELBOARDS

A. Seismic-Restraint Loading: Fabricate and test panelboards according to IEEE 344 to withstand seismic forces defined in Section 260548.16 "Seismic Controls for Electrical Systems."

B. Enclosures: as applicable for mounted cabinets; NEMA 250’

C. Retain "Service Equipment Label" Paragraph below for panelboards that incorporate one or more main service disconnecting and overcurrent protective devices and that are used as the service entrance, outside feeder, or separately derived source means of disconnect and overcurrent protection.

D. Service Equipment Label: Nationally Recognized Testing Laboratory (NRTL) labeled for use as service equipment for panelboards with one or more main service disconnecting and overcurrent protective devices; UL Listed Class CTL panelboards.

E. Future Devices: Mounting brackets, bus connections, filler plates, and necessary appurtenances required for future installation of devices.

F. Panelboard Short-Circuit Current Rating: Rated for series-connected system with integral or remote upstream overcurrent protective devices and labeled by an NRTL. Include size and type of allowable upstream and branch devices; listed and labeled for series-connected short-circuit rating by an NRTL.

PANELBOARDS 262416 - 2

G. Panelboard Short-Circuit Current Rating: Fully rated to interrupt symmetrical short-circuit current available at terminals.

2.3 DISTRIBUTION PANELBOARDS

A. Panelboards: NEMA PB 1, power and feeder distribution type.

B. Doors: Secured with vault-type latch with tumbler lock; keyed alike.

C. Mains: Sized appropriately to current load.

D. Branch Overcurrent Protective Devices: Plug-in circuit breakers.

2.4 LIGHTING AND APPLIANCE BRANCH-CIRCUIT PANELBOARDS

A. Panelboards: NEMA PB 1, power and feeder distribution type.

B. Doors: Concealed hinges; secured with flush latch with tumbler lock; keyed alike.

C. Mains: Sized appropriately to current load/ as applicable.

D. Branch Overcurrent Protective Devices: Plug-in circuit breakers.

2.5 DISCONNECTING AND OVERCURRENT PROTECTIVE DEVICES

A. Molded-Case Circuit Breaker: Comply with UL 489

1. Application Listing: Appropriate for application; Type SWD for switching fluorescent lighting loads; Type HID for feeding fluorescent and high-intensity discharge (HID) lighting circuits.

2. Ground-Fault Circuit-Interrupter Circuit Breakers: Single- and two-pole configurations with Class A ground-fault protection (6-mA trip).

B. Fused Switch: NEMA KS 1, Type HID; clips to accommodate specified fuses; lockable handle;

as applicable.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Receive, inspect, handle, store, and install panelboards and accessories according to proper sizing and in accordance with NEC/specific location for mounting.

B. Comply with mounting and anchoring requirements specified in Section 260548.16 "Seismic Controls for Electrical Systems."

C. Mount top of trim in accordance with NEC unless otherwise indicated and approved by COR.

PANELBOARDS 262416 - 3

D. Arrange conductors into groups; bundle and wrap with wire ties in accordance with NEC or as needed.

E. Create a directory to indicate installed circuit loads and incorporating Owner's final room designations. Obtain approval before installing.

END OF SECTION 262416

B. Fused Switch: NEMA KS 1, Type HID; clips to accommodate specified fuses; lockable handle; as applicable.