master_spec_16316_en.pdf

Section 16316 1

SECTION 16316

SWITCHBOARDS

PART 1 - GENERAL

1.1 APPLICABLE PUBLICATIONS

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

ITALIAN ELECTROTECHNICAL COMMISSION (COMITATO ELETTROTECNICO ITALIANO) (CEI)

PUBLICATIONS

CEI 7-6 (1997) Test of Hot-Dip Galvanization for

Ferrous Materials for Electrical Systems and Lines.

CEI 17-5 (2004) Automatic Circuit Breakers for Rated

Voltages not Greater than 1000V a.c. and 1200V d.c.

CEI 17-11 (2000) Operating Switches, Disconnectors, Air Breakers-Disconnectors and Fuses Combined Units for Rated Voltages not Greater Than 1000V a.c. and 1500V d.c.

CEI 17-13/1 (2000) Prefabricated Assemblies - ACF -

(Electrical Panels) for Rated Voltages not Greater Than 1000V a.c. and 1200V d.c.

CEI 17-13/2 (2000) Prefabricated assemblies – Part 2:

Special prescription for electrical bar.

CEI 64-8 (2004) Electrical Systems with Rated

Voltages not Greater Than 1000V a.c. and 1500V d.c.

ITALIAN LAW

DPR 547/1995 Accident Prevention Norms.

Law 186/1968 Disposition about production material, devices, installation and electrical and electronic plant.

Law46/1990 Plant safety norm

DPR 447/1991 Norm for implementation of Law 46/1990, plant safety norm.

DPR 380/2001 Norms collections about buildings construction.

ITALIAN NATIONAL INSTITUTE FOR THE UNIFICATION OF STANDARDS (ENTE NAZIONALE

ITALIANO DI UNIFICAZIONE) (UNI) PUBLICATION

UNI ISO 2063 (1993) Hot-Dip Protective Coatings:

Characteristics, Classifications and Test on Zinc Coating on Ferrous Materials.

2 Section 16316

1.2 GENERAL REQUIREMENTS

Section 16050, "Basic Electrical Materials and Methods" applies to this section, with the additions and modifications specified herein. Equipment, materials, installation, and workmanship shall be in accordance with the required and advisory provisions of CEI 17-13. Materials not normally furnished by the manufacturer of the equipment shall be provided in Section 16402, "Interior Distribution Systems."

1.3 SUBMITTALS

1.3.1 Materials and Equipment

In accordance with what required in detail in the technical specifications and contract design drawings.

1.3.2 Manufacturer’s Data

Consisting of manufacturer's data in sufficient detail to verify compliance with the contract documents.

a. Switchboards

b. Circuit breakers

1.3.3 Shop Drawings

Furnish drawings for switchboards including, but not limited to, the following:

a. Overall dimensions and front view.

b. Ampere ratings of bus bars.

c. Maximum short circuit bracing.

d. Circuit breaker type, interrupting rating, trip setting.

e. Provision for future extension.

f. One-line diagram.

1.3.4 Certified Laboratory Test Reports

a. Switchboard Paint Qualification Test: Furnish reports showing that the paint qualifications test of CEI 7-6 has been performed to ensure the adequacy of finishes to inhibit the build-up of rust on ferrous metal materials used for enclosures.

PART 2 - PRODUCTS

2.1 DISTRIBUTION SWITCHBOARDS CEI 17-13

Switchboards shall be floor standing, dead front, metal enclosed, self supporting, front accessible. Devices shall be mounted in individual compartments with a separate hinged door and the operating handle mounted on the compartment door. Switchboards shall be completely factory engineered and assembled including protective devices, interconnections, instruments and control wiring. Switchboards shall consist of an incoming main circuit breaker section, distribution sections and cable reascending lateral section for cable incoming and outgoing terminal boards, shall have metal framed front door in crystal/plexiglass and entirely metal equipment covering

Section 16316 3 internal door.

2.1.1 Phase Buses and Connections

Mount bus structure on insulated supports of high-impact, non-tracking, high-quality insulating material. Brace bus structure to withstand mechanical forces exerted during short circuit conditions when connected directly to a source having maximum of 50K amperes RMS symmetrical available. Bus bars shall be high conductivity copper with silver-plated joints. Plating shall be minimum 0.005 mm thick. Connect bus bars from main buses to the incoming circuit breaker studs. Provide cable supports for outgoing cables. Isolate cable compartments from bus compartments.

2.1.2 Neutral Bus

Provide a full size isolated neutral bus of the same material as the phase bus bars light blue colored.

2.1.3 Ground Bus

Provide a copper ground bus secured to each vertical structure and extending the length of the switchgear. Equip ground bus with a terminal for connection to the service ground.

2.1.4 Main Circuit Breaker

Manually operated stationary mounted molded case circuit breaker with an interrupting rating not less than 45,000 amperes symmetrical at 380 volts, 50 hertz. Equip breaker with solid-state trips, with current sensors, solid state logic and ground fault protection integral to the circuit breaker frame. The solid state current control shall provide adjustable ampere setting, long time delay, short time delay, and instantaneous trip so that feeder breakers will normally trip first on overload and at lower fault-current levels. The long time current adjustment shall be set at 125 percent of the full load secondary current. Long time and short time delays shall be set to provide the coordination described above.

2.1.5 Secondary feeder breakers

Molded-case type breakers. Circuit breakers less than 400A shall be thermal magnetic molded case type. All circuit breakers shall be mechanically trip free, and the handle position shall indicate whether the breaker is "on," or "off," or "tripped". An overload in one phase shall cause all three phases to trip.

2.1.6 Nameplates

Provide laminated plastic nameplates for each breaker, switch or device to identify its function, and where applicable, its position. Laminated plastic, 3 millimeters thick, melamine plastic white with black center core.

Surface: matte finish; corners: square. Accurately align lettering and engrave into the black core. Size of nameplates: 25 millimeters by 65 millimeters minimum; lettering: minimum 6 millimeters high normal block lettering. Provide number, location, and letter designation of nameplates as indicated. Fasten nameplates to the device with a minimum of two sheet-metal screws or two rivets. All labels shall be in English and Italian.

2.2 CORROSION PROTECTION

Bases, frames, and channels of switchgear and switchboards which come in contact with concrete shall be corrosion resistant and shall be fabricated of hot-dip galvanized steel.

4 Section 16316

2.2.1 Galvanized Steel

It shall conform to UNI ISO 2063 coating, as applicable. Galvanize after fabrication where practicable.

PART 3 - EXECUTION

3.1 INSTALLATION

Electrical installations shall conform to manufacturer's recommendations, and to the requirements specified herein. Provide new equipment and materials, unless indicated or specified otherwise.

3.2 GROUNDING

CEI 64-8 and Section 16402, "Interior Distribution System," except that grounds and grounding system shall have a resistance to solid earth ground not exceeding 10 Ohms.

3.3 INSTALLATION OF EQUIPMENT AND ASSEMBLIES

Install and connect switchboards as indicated in project drawings, the approved shop drawings, and as specified herein. Receive, unload, store if necessary, install and connect as indicated and specified.

3.3.1 Galvanizing Repair

Use galvanizing repair paint for galvanizing damaged by handling, transporting, cutting, welding, or bolting. Do not heat surfaces that repair paint has been applied to.

3.3.2 Wiring and Connections

Provide wiring and make connections as specified in Section 16402, "Interior

Distribution Systems."

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SECTION 16316 SWITCHBOARDS