B.08.02.07 BASIS OF DESIGN (BOD).pdf

PREPARED BY:

THE OK DESIGN GROUP, Srl

ARCHITECTS, PLANNERS, CONSULTING ENGINEERS

VIA ANGELO BARGONI 78 ‐ 00153 ROME, ITALY

Claudia Cattarin

DIRECTORATE OF PUBLIC WORKS

U.S. ARMY GARRISON ITALY – APO AE 09613

DARBY MILITARY COMMUNITY

PROJECT ED 00176‐8

UPGRADE ELECTRICAL SYSTEM CAMP DARBY (SOUTH)

CAMP DARBY AREA, LIVORNO, ITALY

CONTRACT NO.: W912PF‐16‐D‐0007 T.O. 003 DMC FINAL DESIGN SUBMITTAL

DATE: MARCH 2021

BASIS OF DESIGN/DESIGN ANALYSIS/APPENDICES

Upgrade Electrical System Camp Darby (South) BASIS OF DESIGN/DESIGN ANALYSIS Camp Darby Area, Livorno, Italy TABLE OF CONTENTS Contract No. W912PF‐16‐D‐0007 T.O. 003 DMC ‐ Project ED 00176‐8

TABLE OF CONTENTS

‐ BASIS OF DESIGN/DESIGN ANALYSIS

1. ARCHITECTURAL

2. STRUCTURAL

3. MECHANICAL

4. ELECTRICAL

5. CIVIL (NOT USED)

‐ MANAGEMENT OF UNEXPLODED ORDNANCE

‐ ENVIRONMENTAL INCIDENCE ANALYSIS

‐ APPENDICES

A. STATEMENT OF WORK

B. PREDESIGN MEETING MINUTES AND ATTENDANCE LIST

C. CATALOG CUTS

D. PICTURES

E. MINUTES OF 35% DESIGN REVIEW MEETING AND ATTENDANCE LIST

F. 35% DESIGN SUBMITTAL COMMENT REBUTTALS

G. MINUTES OF 90% DESIGN REVIEW MEETING AND ATTENDANCE LIST

H. 90% DESIGN SUBMITTAL COMMENT REBUTTALS

I. PRE‐BID REVISION COMMENT REBUTTALS

BASIS OF DESIGN/DESIGN ANALYSIS

Camp Darby Area, Livorno, Italy ARCHITECTURAL BASIS OF DESIGN

Pag. 1

INDEX

1. ARCHITECTURAL

1.1 SCOPE OF WORK

1.2 CRITERIA AND REFERENCE

1.2.1 Criteria

1.2.2 References

1.3 PROJECT DESCRIPTION

1.3.1 Existing Condition of the Substation Enclosures

1.3.2 New Condition of the Substation Enclosures

Pag. 2

1.1 SCOPE OF WORK

Work consists of patching and painting of the interior of the substation prefabricated structures, as a consequence of the replacement of the existing electrical equipment and adaptation or upgrading electrical works.

1.2 CRITERIA AND REFERENCE

1.2.1 Criteria

‐ UFC 1‐200‐02, Unified Facilities Criteria, High Performance And Sustainable Building Requirements;

‐ Department of the Army, United States Army Information Systems

Engineering Command ‐ Technical Guide for Installation Information Infrastructure Architecture;

‐ TI 800‐01 USACE A&E Instructions, Design Criteria;

‐ NFPA Codes, in particular NFPA101;

‐ D.Lgs. n 81 of 09/04/2008: “Norme In Materia di Salute d Sicurezza dei

Lavoratori”;

‐ D.P.R. n. 380 of 06 /06/ 2001: ”Testo Unico Delle Disposizioni Legislative E Regolamenti In Materia Edilizia”;

‐ D.L. n. 152 of 03/04/2006: “Norme In Materia Ambientale”;

‐ D.M. 14 Genn. 2008: “Norme Tecniche Per Le Costruzioni”;

‐ All applicable Italian Codes, in particular CEI and UNI norms.

1.2.2 References

‐ Statement of Work for the Project: ED 00176‐8 “Upgrade Electrical System Camp Darby (South)”, dated October 17, 2018;

‐ Kick‐Off meeting dated March 19, 2019;

‐ Technical survey, dated March 19 and 20, 2019, and April 9 and 10, 2019;

‐ 35% Review Conference, 31 July 2019;

Pag. 3

‐ Additional site survey on 31 July 2019;

‐ 90% Review Conference, 6 February 2020;

‐ Additional site survey on, 6 February 2020;

‐ Additional site survey on, 25‐26 June 2020;

‐ Pre‐Bid Revision Comment Rebuttals.

Project requirements and criteria contained in the above mentioned publications are considered valid for all practical purposes and not in contrast with the norms, laws and materials normally used at US Bases in Italy.

1.3 PROJECT DESCRIPTION

1.3.1 Existing Condition of the Substation Enclosures

The existing transformer substations consist of prefabricated reinforced concrete structures, with resin doors and ventilation louvers. The prefabricated concrete enclosures are installed on concrete pads. The roof also is constructed of prefabricated concrete and in few cases the waterproofing is no longer efficient. Roof is formed of precast‐reinforced concrete elements, with two ply bituminous waterproofing membrane. The flashing, all around the perimeter roof is in copper. A similar flashing is generally installed over the entrance door. The interior walls and the ceiling are painted with two coats of white distemper paint; the exterior walls are generally painted using quartz paint.

1.3.2 New Condition of the Substation Enclosures

All the existing equipment inside the substations including through wall fan and louver will be repaired by replacement and then the interior walls shall be patched to repair holes and cracks and painted with two coats of white distemper paint. Works will include:

‐ All architectural works required for the construction of the new prefabricated concrete substation SS#118 and SS#776;

‐ Patching and painting all substations and repair of architectural and/or structural deficiencies of all the renovated substations;

‐ Holes of 250mm diameter will be performed on the roof of each substation for the installation of a natural vent stack; special care will be paid to the waterproofing at the hole edge;

Pag. 4

‐ All the existing equipment inside the substations including through wall fans will be repaired by replacement, and then the interior walls and ceilings shall be patched to repair holes and cracks and painted with two coats of white distemper paint;

‐ The exterior walls will be also patched and painted using quartz paint with synthetic resins, quartz powders and additives;

‐ Roof of all renovated substations will be restored by complete removal of the existing waterproofing membranes, and application on the precast‐reinforced concrete elements, of two ply bituminous waterproofing membrane, the top one self protected with slate chips. Existing flashing will be also replaced, or new flashing will be provided were missing;

‐ Concrete floors of the renovated substations will be also restored by the application of a suitable resin product;

‐ All doors of the substations will be cleaned and repaired as needed.

2. STRUCTURAL

Camp Darby Area, Livorno, Italy STRUCTURAL BASIS OF DESIGN

2. STRUCTURAL

2.1 SCOPE OF WORK

2.2 CRITERIA AND REFERENCE

2.2.3 Criteria

2.2.2 References

2.3 PROJECT DESCRIPTION

2.3.1 Existing Condition of the Underground Concrete Structures

2.3.2 Existing Condition of the Substation Enclosures

2.3.3 New Condition of the Cable Ducts and Substation Enclosures

2.3.4 Material

2.3.5 New Substation

2. STRUCTURAL

2.1 SCOPE OF WORK

Work consists of structural work connected with the replacement of the new underground concrete structures and incidental adaptation or expansion of the existing concrete substation enclosures.

2.2 CRITERIA AND REFERENCE

2.2.3 Criteria

UFC 3‐310‐04 Seismic design of buildings;

ASCE/SEI 7‐10 Minimum design loads for buildings and other structures;

AISC 360‐10 Specification for structural steel buildings;

ACI 318‐14 Building code requirements for structural concrete;

Norme Tecniche per le Costruzioni ‐ D.M. 14 Gennaio 2008 (identified with the prefix “NTC 2008”);

Circolare n. 617 del 02.02.2009.

2.2.2 References

‐ Statement of Work for the Project: ED 00176‐8 “Upgrade Electrical System Camp Darby (South)”, dated October 17, 2018;

considered valid for all practical purposes and not in contrast with the norms, laws and materials normally used at US Bases in Italy.

2.3 PROJECT DESCRIPTION

2.3.1 Existing Condition of the Underground Concrete Structures

Underground concrete structures consist of the cable ducts and manholes used for medium and low voltage electrical cable ducts and communication cable ducts. Most of the cables are installed in underground cable ducts. Communication cable duct is also extended and cover all areas of the base.

Reinforced concrete manholes are of two sizes, one small 1.20x1.20x1.20m both for electrical than communication cables and big 4.10x2.20x2.5m used only for communication cables.

2.3.2 Existing Condition of the Substation Enclosures

The existing transformer substations consist of prefabricated reinforced concrete structures. The prefabricated concrete enclosures are installed on concrete pads. The roof also is constructed of prefabricated concrete. Floor of the substation is provided of trenches for the cable installation.

2.3.3 New Condition of the Cable Ducts and Substation Enclosures

Structural work includes mainly minor structural work which support the electrical cable duct installation. New medium and low voltage cables will be installed inside new concrete encased cable ducts with reinforced concrete manholes. Some minor structural work may be needed to provide special connection to existing manholes or substation enclosures. Details of the cable ducts are included in the electrical section.

2.3.4 Material

For reinforced concrete manholes or concrete pads and other new r.c. structural elements shown on structural or electrical drawings. Concrete for communication manholes shall be water resistant. The various new reinforced concrete structures shall meet the following requirements:

‐ Concrete Class C28/35, for all main reinforced concrete structures, 28‐day min.

characteristic cube strength: fck =280 kg/cm2.

‐ Concrete Class C16/20, for all reinforced concrete structures, 28‐day min.

characteristic cube strength: fck =160 kg/cm2.

‐ Reinforcing Steel Type FeB44K with the following characteristics:

Ultimate tensile strength = 5500 kg/cm2 Yield Point = 4400 kg/cm2 Elongation = 12%

2.3.5 New Substations

The project includes the construction of two complete prefabricated concrete substations. Also, the basement will be prefabricated and provided together with the aboveground enclosures. The concrete enclosures shall be modular prefabricated standard type, similar to the existing facilities at Camp Darby, and shall be provided by the Manufacturer of all calculations and certifications required by Law.

3. MECHANICAL

Camp Darby Area, Livorno, Italy MECHANICAL BASIS OF DESIGN

3. MECHANICAL

3.1 CRITERIA AND REFERENCE

3.1.1 Criteria

3.1.2 References

3.2 PROPOSED WORK

3.2.1 Transformer Room Exhaust Fan Sizing (Reference: UFC 3‐410‐01, para.D407.3)

3.2.2 Natural Ventilation

3. MECHANICAL

3.1 CRITERIA AND REFERENCE

3.1.1 Criteria

‐ NFPA 101, “Life Safety Code”, 2018

‐ Applicable UNI Publications

‐ UFC 1‐200‐01, General Building Requirements

‐ UFC 1‐300‐09N, Design Procedures

‐ UFC 3‐410‐01, Heating, Ventilating, and Air Conditioning Systems

‐ ASHRAE 62.1‐2016, Ventilation for Acceptable Indoor Air Quality

‐ DLGS 37/08, Certification of Technological systems, and latest updates

‐ D.M. 14/1/2008, Technical Norms for Constructions

‐ DLGS 81/08, Safety and Health Norms for Workers

‐ Law 6 June 2001, n. 380, Unique Text of Codes and Rules for Building

Construction

‐ The Federal Energy Management Program (FEMP).

‐ UFC 3‐800‐10N, “Environmental Engineering for Facility Construction”

3.1.2 References

‐ Statement of Work for the Project: ED 00176‐8 “Upgrade Electrical System Camp Darby (South)”, dated October 17, 2018;

considered valid for all practical purposes and not in contrast with the norms, laws and materials normally used at US Bases in Italy.

3.2 PROPOSED WORK

Project includes the removal of existing exhaust fans located inside the substations with the associated room thermostats, and the installation of a new split‐type DX cooling‐only air conditioning unit.

Transformers inside the substations work at no more than 75% of their rated load.

The heat to be removed has been calculated on the power loss dissipated by the transformer in the form of heat. Temperature rise of the transformers is due approximately by the winding losses (copper losses or load power). To size the new air conditioning unit, it is assumed that the thermal energy is dissipated uniformly throughout the surface area of the winding assembly at all ambient temperatures.

3.2.1 Transformer Room Exhaust Fan Sizing (Reference: UFC 3‐410‐01, para.D407.3)

Room shall be provided with mechanical exhaust, sized to limit space temperature during summer to 6°C above outdoor summer design temperature. The calculations are performed for the bigger size of transformer used.

Outdoor summer design temperature: 31.5°C (ref. UNI 10339) Maximum allowable space temperature: 31.5 + 6 = 37.6°C

In user systems, transformers are only rarely charged for nominal power and for short periods, while the average power supplied is generally around 70% of the nominal power. In these conditions, the Joule losses, which vary with the square of the supplied current, are reduced to about 50% of the losses at the rated power (the losses in the iron remain constant).

Dimensioning of the ventilation system The heat produced by the equipment installed in the cabin leads to an increase in the internal temperature of the room (Ti) compared to the external temperature (Te).

The temperature Ti continues to increase until, at thermal regime, the thermal power PPT produced by the equipment is balanced by the thermal power PST disposed of by the ventilation system (natural and / or forced).

Under conditions of thermal equilibrium, the following relation (1) therefore applies:

PPT = PST = n • V • ρi • cP • (Ti ‐ Te) (kW)

Where is it:

n = number of air changes per second (s‐1);

V = volume of the room (m3);

ρi = volume mass (commonly called density) of the air inside the room (kg / m3);

cP = mass thermal capacity of the air (equal to 1.013 kJ / kg K). (the mass heat capacity is also called specific heat.)

From the relation (1) it is possible to obtain the air flow qs (m3 / s) necessary for cooling the room, expressed by the following relation (2):

The air flow rate qV of the fan / extractor necessary to dispose of the total thermal power PPT (in kilowatts) dissipated in the cabin can be obtained from formula (2), cautiously increasing by 10% to compensate for pressure drops (if you use air ducts, it may be necessary to increase the increase factor of the door qV to take into account the additional pressure drops due to the same ducts.

The action of the fan is such as to cancel the natural draft of the ventilation openings; for this reason the qST flow rate due to the chimney effect is not added to the qV flow rate.

Assuming an external temperature of 30 ° C and a maximum internal temperature of 40 ° to which ρi = 1.13 kg / m3 corresponds to an altitude s.l.m. 0 m), we obtain the relation (7):

qV = 9.61 • 10‐2 PPT (m3 / s)

Where PPT is expressed in kilowatts. Multiplying by 3600 you can obtain the corresponding hourly air flow of the fan qVh = 343 PPT (m3 / s)

Pag. 5

3.2.2 Natural Ventilation

In accordance with the Base request each substation will be provided with a natural air ventilation stack. The ventilation stacks will be stainless steel, and will be provided with a device to prevent the inverse rotation when the electrical fans are in operation

Pag. 6

Camp Darby South MEDIUM VOLTAGE

NETWORK

SUBSTATION

VENTILATION

DATE: 14/05/2020

PAGE: 1

Substat.

VOLT. TRX

Insulation

P0 no load (Fe)

Pk (*) 70%load (Cu)

Pp total loss

Ppt (**) total loss

Qs needed balance air flow

Qv needed fan air flow

Qf fan air flow

(kV) (kVA) (W) (W) (kW) (kW) (m3/s) (m3/s) (m3/h)

(l/s)

808 15

15/

250 RESIN 520 1700 2,22 2,442

0.4‐0.23 0,22 0,2411 241

15/

500 RESIN 900 2815 3,715 4,0865

0.4‐0.23 0,37 0,4034 403

15/

500 RESIN 900 2815 3,715 4,0865

0.4‐0.23 0,37 0,4034 403

15/

250 RESIN 520 1700 2,22 2,442

0.4‐0.23 0,22 0,2411 241

15/

800 RESIN 1300 4000 5,3 5,83

0.4‐0.23 0,52 0,5755 576

15/

400 RESIN 750 2250 3 3,3

0.4‐0.23 0,30 0,3258 326

15/

500 RESIN 900 2815 3,715 4,0865

0.4‐0.23 0,37 0,4034 403

15/

500 RESIN 900 2815 3,715 4,0865

0.4‐0.23 0,37 0,4034 403

15/

500 RESIN 900 2815 3,715 4,0865

0.4‐0.23 0,37 0,4034 403

15/

250 RESIN 520 1700 2,22 2,442

0,22 0,2411 241

(*) On load losses have been calculated at 70% of transformer load.

(**) Pp total loss has been added of 10_% to include other equipment losses

4. ELECTRICAL

Camp Darby Area, Livorno, Italy ELECTRICAL BASIS OF DESIGN

Page 1.

4. ELECTRICAL SYSTEMS

4.1 SCOPE OF WORK

4.2 CRITERIA

4.3 REFERENCES

4.4 EXISTING CONDITION

4.5 PROPOSED WORK

4.5.1 Electrical System

4.5.2 Communication System

4.5.3 Miscellaneous

4.5.4 Medium Voltage Loop

4.5.5 Medium Voltage Switchgears

4.5.6 Transformers

4.5.7 Low Voltage Switchboards

4.5.8 Automatic Power Factor Compensating Units

4.5.9 Communication and Remote Control System

4.5.10 Lighting and Power Systems

4.5.11 Temperature Control

4.5.12 Architectural and Structural Works

4.6 MATERIALS

4.6.1 Medium Voltage and Low Voltage Cables

4.6.2 Medium Voltage Switchgears

4.6.3 Transformers

4.6.4 Low Voltage Switchboards

4.6.5 Automatic Power Factor Compensating Units

4.6.6 Communication And Remote Control System

4.7 LIGHTING AND POWER DISTRIBUTION

4.7.1 PVC Conduit

4.8 BOXES

4.8.1 Plastic Boxes

4.8.2 Metal Boxes

4.8.3 Wiring

4.8.4 Lighting

4.8.5 Emergency Lighting

4.8.6 Receptacles

4.8.7 Lighting Switches

4.8.8 Grounding

4.9 MEDIUM VOLTAGE CABLE

4.9.1 General

4.9.2 Criteria

4.10 FIXED AND AUTOMATIC POWER FACTOR SIZING

4.10.1 General

4.11 COMMERCIAL POWER COMPANY (ENEL) OFFICIAL LETTER

4.11.1 General

Page 2.

4.12 MAXIMUM NUMBER/SIZE OF TRANSFORMERS ALLOWED BY COMMERCIAL

POWER COMPANY TO BE FED SIMULTANEOUSLY

4.12.1 General

4.13 FEEDER PARAMETERS AND SHORT CIRCUIT ANALYSIS

4.13.1 General

4.14 GROUNDING AND STEP/CONTACT VOLTAGE POTENTIAL ANALYSIS

4.14.1 General

4.14.2 Minimum Required Value of Resistance to Earth

4.14.3 Calculation of Resistance to Earth of the Substation Grounding System

4.14.4 Grounding/PE conductor sizing

4.15 CONTRACTUAL AVAILABLE MAX POWER AT THE ENERGY DELIVERY POINTS

AGAINST ESTIMATED POWER REQUIRED FOR CAMP DARBY ELECTRICAL

FEEDING

4.15.1 General

ATTACHMENTS

A. MANHOLE SURVEY

B. ARC FLASH RISK ASSESSMENT

C. LIGHTING CALCULATIONS

Page 3.

4. ELECTRICAL SYSTEMS

4.1 SCOPE OF WORK

This project includes the design of electrical and special systems, needed for the repair by replacement of the existing transformer substations inside the Camp Darby area at Livorno US ARMY base. Camp Darby area has been divided in two areas:

‐ Camp Darby South area that is under the jurisdiction of the US ARMY Command;

‐ Camp Darby North area that is under the jurisdiction of the Esercito Italiano.

The present project consists in the renovation of the Camp Darby South transformer substations, the replacement of the medium voltage distribution feeders, and some other repair and upgrading also to the low voltage distribution. The existing medium voltage and low voltage electrical distribution in the North Area is not included in the present project, but it shall be left in operation. The substations included in the renovation/upgrading work are:

‐ SS#104

‐ SS#107

‐ SS#118

‐ SS#211

‐ SS#724

‐ SS#727

‐ SS#738

‐ SS#739

‐ SS#776

‐ SS#920

All the above listed substations will be fed by a new 15kV feeder. Furthermore the following substations, located in the Camp Darby North area, are under responsibility of the Italian Esercito and will not be part of the US Army medium voltage network:

‐ SS#300

‐ SS#742

‐ SS#743

‐ SS#744

‐ SS#745

‐ SS#746

‐ SS#814.

Page 4.

Power Delivery Substation at Camp Darby area is at bldg #808; there are two MV circuit breakers that feed bldg #807, with a 15kV buried cable; bldg#807 houses a 2500kVA 15kV/10kV transformer, feeding Camp Darby through a 10kV distribution system with underground cables.

To allow the renovation of the substations and the upgrading to 15kV voltage, the project provides an additional circuit breaker in the delivery power substation #808 which will allow the direct connection at 15kV of the renovated Camp Darby South MV network.

At present there is only one power delivery point feeding the Camp Darby medium voltage network, and to improve the reliability of the power supply an additional motorized disconnect switch will be provided inside the substation #808. This new motorized switch will allow feeding the Camp Darby network by the other power delivery points located at depot North and South. The sequence of operation shall be thoroughly studied and implemented with the proper interlocks to avoid wrong connections. The existing MV feeder cable is mostly routed in cable duct, all the new cable will be installed inside underground cable duct.

In addition, several portions of cable ducts are occupied by MV and LV cables, this commingling of different class cables is not safe and will be eliminated with the present project.

Work includes demolition of the existing electrical systems and removal of the equipment inside the substations, provision of new high voltage switchgears, transformers, low voltage switchboards, capacity banks, communication devices and cables for remote control, lighting, power receptacles, and other ancillary systems.

Project includes the provision of new fiber optic cables in the existing communication cable ducts between the substation, and the construction of new communication cable ducts with fiber optic cable which integrates the existing communication system.

A new monitoring system by SCADA technology will be also provided for the monitoring and tele‐control of the substation’s equipment from a centralized station.

New substation control system will be connected by star topology to the existing communication node recently installed at building #204 in the Camp Darby area and to the existing central control workstations at buildings #5155 (PWO) and #5140 (Electrical Shop) already provided for the monitoring of the DEPOT and ASA medium voltage networks. These workstations will be updated with the required hardware and software to include all the substations included in this project.

Page 5.

Excavation works for the new power and communication cable ducts may be performed only after the UXO inspection and are subject to the opinion of the Authorities on Environmental matters through the submission of the “Valutazione di Incidenza Ambientale (VINCA)”. The new systems will be designed in accordance with electrical U.S. and Italian standards, laws and regulations.

4.2 CRITERIA

‐ D.M. n.37, 22 January 2008 “Requirements for safe systems installation inside the buildings”;

‐ Applicable CEI Publications;

‐ Applicable UNI Publications;

‐ NFPA 101, “Life Safety Code”, 2018;

‐ NFPA 70, “National Electrical Code”, 2017;

‐ UFC 1‐300‐09N, “Design Procedures”;

‐ UFC 3‐501‐01, “Electrical Engineering”;

‐ UFC 3‐530‐01, “Interior, Exterior lighting and Control”;

‐ UFC 3‐560‐01, “Electrical Safety, O&M”;

‐ UFC 3‐580‐01, “Telecommunications Interior Infrastructure Planning Design”;

‐ UFC 3‐800‐10N, “Environmental Engineering for Facility Construction”;

‐ TIA‐569, “Commercial Building Standard for Telecommunications Pathway and Spaces”, 2012‐2013;

‐ TIA‐607, “Generic telecommunications Bonding and Grounding (Earthing) for

Customer premises”, 2011;

‐ USAREUR, “Internal Cable Distribution System (ICDS), June 2017

‐ Technical Criteria for the Installation Information Infrastructure Architecture (I3a), February 2010.

‐ Unclassified 2nd Theater Signal Brigade Implementing Inside and Outside

Plant (CDS(ICDS) Cabling Distribution Systems within USAREUR, June 2017.

Page 6.

4.3 REFERENCES

‐ Statement of Work for the Project: ED 00176‐8 “Upgrade Electrical System Camp Darby (South)”, dated October 17, 2018;

considered valid for all practical purposes and not in contrast with the norms, laws and materials normally used at US Bases in Italy.

4.4 EXISTING CONDITION

At present there are ten substations, fed at 10kV by the main substation SS#807, in the Camp Darby South area:

‐ SS#104 (unit 13);

‐ SS#107 (also named Smistamento);

‐ SS#118 (unit 14);

‐ SS#211 (unit 10);

‐ SS#724 (recently renovated and housed in the north‐west corner of the building #727);

‐ SS#727 (unit 4, the most northern of the substations, that feeds the remaining Camp Darby North substations);

Page 7.

‐ SS#738 (unit 1);

‐ SS#739 (unit 2);

‐ SS#776 (unit 3, recently renovated and divided in two separate housings, one for the switchgears and one for the transformers);

‐ SS#920 (unit 12, the most southern of the substations).

Existing substations are equipped with several types of medium voltage switchgears, mainly manufactured by Magrini Galileo, Merlin Gerin, ICET with switches SACE, AREVA with switches SCHNEIDER, and ABB.

The existing transformers are oil filled, unless for SS#118, SS#739, SS#776, and SS#920 where the transformers are resin insulated.

Substations are provided with fluorescent lighting fixtures controlled by lighting switches inside the enclosures, there is a power receptacle and exhaust system constituted by electric motor driven fans controlled by thermostats.

In the substation #807 the 2500kVA step‐down transformers used to convert the power from 15kV to 10kV are also oil insulated.

These transformers will be removed and disposed at the end of work when all the system is complete and in operation directly connected to 15kV commercial power through the substation #808.

Each substation is provided with a local grounding systems, generally constituted by copper ground rods at each corner of the substation and a copper cord ring.

In the attachment A – “Existing Pit”, the results of the surveys on the relevant electrical manholes are shown.

Page 8.

A schedule with the main electrical equipment features in each substation is shown herein after, the highlighted substations are modified under this project:

project: EA‐00176‐8 UPGRADE ELECTRICAL SYSTEM CAMP DARBY SOUTH

CAMP DARBY SOUTH MEDIUM

VOLTAGE NETWORK

EXISTING CONDITION

DATE: 26/05/2019

SUB‐

STATION

VOLT.

(kV) FEEDER FROM TO

CABLE

SECTION

(sqmm)

LENGHT

(m)

XFRM

(kVA)

VOLT.

(kV) REMARKS

TRAFO

INSULA‐

TION

MV

SWITCH‐

GEAR

808 15 C1 808 807 3x1x50 102 ‐

807 15 C2 807 107 3x1x50 160 2500 15/10/0.

38‐0.22 OIL

107 10 C3 107 104 3x1x50 115 100 10/0.5 OIL

104 10 C4 807 104 3x1x50 265 500 10/0.5 OIL

920 10 C5 107 920 3x1x50 136 250 10‐15/

0.4‐0.23 RESIN

738 10 C6 107 738 3x1x50 182 250 10‐15/

0.4‐0.23 OIL

739 10 C7 738 739 3x1x50 186 800 10‐15/

0.4‐0.23 RESIN

724 10 C8 739 724 3x1x50 320 400 10/

0.4‐0.23 RESIN

776 10 C9 724 776 3x1x50 76 400 10‐15/

0.4‐0.23 RESIN

727 10 C10 776 727 3x1x50 354 500 10‐15/

0.4‐0.23 OIL

211 10 C11 727 211 3x1x50 194 500 10‐15/

0.4‐0.23 OIL

118 10

C12 807 118 3x1x50 176

10‐15/ 0.4‐0.23 OIL C13 118 211 3x1x50 325

300* 10 C14 211 300 3x1x50 112 315 10‐15/

0.4‐0.23 RESIN

742* 10 C15 727 742 3x1x50 258 630 10/

0.4‐0.23 OIL

814* 10 C16 ‐ ‐ ‐ ‐ 630 10/

0.4‐0.23 RESIN

* Existing Substations located in the North area, shown for the reconnection only.

Page 9.

Cable identification is referred to the next figure.

Page 10.

4.5 PROPOSED WORK

4.5.1 Electrical System

Existing 10kV system shall be converted to a 15kV system, but before proceeding to the upgrade of the existing South substations, the North substations shall be connected by a dedicated feeder from the 10kV switchgear of the substation #807.

No work is foreseen to restore the 10 kV power supply to the North portion of the medium voltage network due to the incoming works by Italian Esercito to provide a separate point of connection to Commercial Power Provider.

The existing underground cables shall be replaced and shall be installed in the existing cable duct, if possible, or new cable duct as indicated on contract drawings.

Commingled low voltage and medium voltage cables shall be separated in the cable duct, to allow the separation new segment of cable ducts will be provided and low voltage cables will be installed inside them. New low voltage cables will be spliced to the existing ones or, if economically feasible will be reinstalled from the substation up to the loads served.

All the electrical equipment in the existing substations shall be removed and replaced with new equipment and materials. Switchgears, transformers, power factor compensating units, and ancillary devices shall be standard product compatible with existing system installed at DEPOT area, and under upgrading at ASA area.

The enclosure of substation bldg#118 (Carnival area) is too small to house the new equipment and will be replaced.

Substation bldg#776, recently constructed, shall be re‐built to provide a standard substation able to house the equipment compatible with the existing ones in one single enclosure.

The existing Power Factor Compensating Units shall be replaced and transported to public dump, but the units in good conditions shall be delivered to the Base, as directed by Contracting Officer. Transformers of the substation #118, #724 and #776 which are new will be salvaged.

Page 11.

MV switchgears shall be certified Loss of service Continuity;

If possible due to the space available in the existing prefabricated concrete substations the LV switchboards shall be Form 3b;

In the Low Voltage switchgears, the circuit breakers 230V shall be limited to the served loads, other ways the 400V circuit breakers shall be provided for the existing loads plus 20% spare;

4.5.2 Communication System

A new fiber optic system shall be installed for the remote control of the MV system, equipment shall be approved by Communication Department, the new fiber optic cables shall be connected to the HUB at the building #204.

The existing monitoring stations in the bldg#5155 (PWO) and bldg#5140 (Electrical Shop) shall be upgraded to allow the monitoring of the renovated substations.

4.5.3 Miscellaneous

The “Valutazione di Incidenza Ambientale” is required for this project.

A/E will evaluate the extension of the Unexploded Ordnance (UXO) detection management and include pertinent requirements in the Safety Plan and contract drawings.

Page 12.

A schedule with the main electrical equipment features that will be provided in each substation is shown herein after:

project: EA‐00176‐8 UPGRADE ELECTRICAL SYSTEM CAMP DARBY SOUTH

CAMP DARBY SOUTH MEDIUM VOLTAGE NETWORK

NEW CONDITION

PAGE: 1

SUSBSTATION

VOLT.

(kV) FEEDER FROM TO

CABLE

SECTION

(sqmm)

LENGHT

(m)

XFRM

(kVA)

VOLT.

(kV) REMARKS

808 15 C1 808 107 3x1x95 162 250‐ 15

107 15 C2 107 104 3x1x95 125 250

15/ 0.4‐

0.23 RESIN

104 15 C3 104 920 3x1x95 304 500

15/ 0.4‐

0.23 RESIN

920 15 C4 920 738 3x1‐x95 190 500

15/ 0.4‐

0.23 RESIN

738 15 C5 738 739 3x1x95 186 250

15/ 0.4‐

0.23 RESIN

739 15 C6 739 724 3x1x95 320 800

15/ 0.4‐

0.23 RESIN

724 15 C7 724 776 3x1x95 76 400

15/ 0.4‐

0.23 RESIN

776 15 C8 776 727 3x1x95 354 400

15/ 0.4‐

0.23 RESIN

727 15 C9 727 211 3x1x95 194 500

15/ 0.4‐

0.23 RESIN

211 15 C10 211 118 3x1x95 325 500

15/ 0.4‐

0.23 RESIN

118 15 C11 118 807 3x1x95 173 500

15/ 0.4‐

0.23 RESIN

807 15 C12 807 808 3x1x95 58 250‐

15/ 0.4‐

0.23 RESIN

Page 13.

Identification of new cables is referred to the next figure.

Camp Darby South – New Condition

Page 14.

4.5.4 Medium Voltage Loop

New medium voltage loop will be constructed with 95sqmm copper cable suitable for 15kV operation, installed in underground cable ducts with pull manholes.

Medium voltage cable will be separated from any other low voltage cable, as much as possible, and will be continuous from the main substation SS#807.

The Base is divided in two areas South and North, only the substations in the South area will be renovated. The power supply to the North Substation is no longer required because area is under responsibility of Italian Esercito.

The existing underground cable ducts will be used as much as possible for the new medium voltage cables. Otherways the existing low voltage cables which are at present installed in the same cable duct will be removed and installed in a separate dedicated cable duct. To allow this work it is necessary the extension of the existing cable with joint to be provided in the manholes.

New cable ducts will be PVC schedule 40, or equivalent, embedded in concrete.

The excavation and installation of the new cable duct through the Camp Darby area is not extended however precautions must be taken:

‐ Before any work, and in accordance with the Piano di Sicurezza e

Coordinamento, the inspection for war site contamination (Ispezione per Bonifica da Ordigni Esplosivi Residuati Bellici) shall be performed;

‐ Approval from the Deputed Authorities shall be obtained for the

Environment Incidence (Valutazione di Incidenza Ambientale);

‐ In case unexploded ordnances are found and identified as explosive devices these shall be eliminated by the skilled technicians of the 5th Division of Esercito Italiano;

‐ Excavation works and construction works may start only after receipt of official approval by the 5th Division of Esercito Italiano of Padova per UXO procedure;

‐ All works including UXO procedure are subject to the allowed period of construction indicated in the VINCA study and as approved by the Park Authority;

‐ Temporary construction fence will be installed, including adequate signals for traffic orientation;

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‐ During excavation, the Contractor will inform immediately the Contracting Officer of any encountered unknown underground utility line or structure;

‐ The dewatering of the excavated areas will discharge into existing ditches or manholes and not on roads, pavements or grassed areas; ground water table is expected between one and two meters below grade, but in autumn and winter seasons and during special storm events the water could be at the ground level;

‐ Shoring and sheeting of the excavated trenches will be performed as necessary to prevent any danger to persons and to adjacent structures;

‐ Contractor will avoid damaging any existing utility or line encountered during the work;

‐ Exterior pavements damaged by the new construction will be restored to the existing conditions;

‐ All removed topsoil will be stockpiled on the job site and used for final grading of the area;

‐ The Contractor will avoid accumulation of debris and creation of dust which could be detrimental to people’s health.

4.5.5 Medium Voltage Switchgears

Each new substation will be equipped with SF6 insulated medium voltage circuit breakers, resin transformers, automatic and fix capacity banks, communication equipment for remote monitoring, ups for relay and communication device support, interior lighting and power receptacles.

4.5.6 Transformers

Transformers will be converted to 15kV primary wind, and secondary voltage will be 400/230V homogeneous in all substations. Where 230V, three‐phase voltage still required dry‐type step‐down autotransformers will be provided.

Winds will be aluminum and insulation will be resin. All transformers will be protected by a metal fence. New transformers will comply with requirements of Commission Regulation (EU) No 548/2014 of 21 May 2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers.

Page 16.

Transformers will be provided with fixed compensating capacitor banks, sized in accordance with the no‐load power of each transformer. Capacitors will be equipped with isolation switch and discharge resistors.

4.5.7 Low Voltage Switchboards

Low Voltage switchboard inside the substations will be also replaced. Each switchboard will be equipped by circuit breakers with electronic relays, ground fault relay, including protection and measurement features. Main LV breakers will be motorized for future tele‐control. LV circuit breakers shall be provided with communication features for remote control, to allow the remote setting of each circuit breaker (trip setting) and the remote monitoring of all the electrical parameters (Voltage, Amperes, Active Power, Reactive Power, Power factor, etc.)

and status of the circuit breaker (trip, open, close, etc.).

All new LV switchboards will be also fed by a back up line to be connected to an exterior diesel generator when necessary.

Each building and in general connected loads, will be fed as much as possible with 1 dedicated circuit breaker and 1 dedicated cable if possible.

4.5.8 Automatic Power Factor Compensating Units

An automatic power factor compensating unit (APFU) will be provided for the substations. Some existing APFUs, at present in good conditions, will be reused for renovated substations.

4.5.9 Communication and Remote Control System

New substation will be equipped with communication devices for the remote control, these communication devices will be connected by new underground fiber optic network. The existing communication cable ducts will be extensively reused by installation of new fiber cables. Additional cable ducts are necessary to complete the network required to control all the substations.

The remote control shall allow the following functions:

‐ Control the motorized MV and LV circuit breakers;

‐ Monitor the electric parameters measured by the MV and LV circuit breakers electronic relays, as well as the status and fault alarms;

‐ Monitor the Transformers temperatures and alarms;

Page 17.

‐ Monitor the UPS status and alarms.

A new monitoring system by SCADA technology will be also provided for the monitoring and tele‐control of the substation’s equipment from a centralized station.

New substation control system will be connected by star topology to the existing communication node recently installed at building #211, and to the existing central control workstations at buildings #5155 (PWO) and #5140 (Electrical Shop) already provided for the monitoring of the DEPOT and ASA medium voltage networks. These workstations will be updated with the required hardware and software to include all the substations included in this project.

Substations automation will comply with IEC 61850, USAREUR ICDS, and TIA standard requirements, the architecture, the devices, and communication protocol will be selected to have the full compatibility with the existing system.

4.5.10 Lighting and Power Systems

All the interior lighting and power receptacle systems inside the substations will be replaced with new ones. Lighting fixtures will be LED type with waterproof enclosures. The emergency shut down devices and power receptacles will be also replaced.

4.5.11 Temperature Control

Substation enclosures are equipped with electric motor driven fans mounted generally over the doors to extract warm through the ventilation louver on the opposite sides of the substations. Motors, grilles, gravity dampers, frames and thermostatic controls will be replaced with new system suitable for the ambient condition and the dissipated heat from the electrical equipment. New fan motors will be propeller, two speed type controlled by an electronic thermostat.

In accordance with UFC 3‐410‐01 “HEATING, VENTILATING, AND AIR CONDITIONING” D407.3 Equipment Room shall be ventilated using outside air intake louvers and thermostatically controlled exhaust fan.

The ventilation fan shall have a two‐speed motor, which is sized, at the high speed, to have adequate capacity to limit the room dry bulb temperature to a maximum of 6°C above the outdoor dry bulb temperature when both equipment and ambient loads are at their maximum peaks.

Page 18.

The high speed will be activated 6°C below the maximum temperature at which the most sensitive item of equipment in the room can operate. The low speed shall operate at 11°C below that of the high speed.

4.5.12 Architectural and Structural Works

Internal patching and painting of all substations and eventual repair of architectural and/or structural deficiencies of the substations.

Complete prefabricated concrete substation enclosures will be provided to replace existing substations SS#118 and SS#776. The substation SS#118 is too low to house the new switchgears and the substation SS#776 is out of the standard (transformer is housed in other prefabricated cabin) and new equipment will not fit in the existing structure.

For details of Architectural works see pertinent chapter of Basis of Design.

4.6 MATERIALS

4.6.1 Medium Voltage and Low Voltage Cables

a) Medium voltage cable will be RG7H1M1 12/20kV, Single‐core cables, insulated with HEPR rubber of G7 quality, under PVC sheath. Cable between switchgear and transformers will be sized 35sqmm. Cable to be used in the loop will be sized 95sqmm. The feeder cable required to restore the 10kV connection to the substations of North area will be 50sqmm as the existing one. Cable will have the following main features:

‐ Conductor: plain copper, compact stranded wire, class 2;

‐ Semiconductor layer: extruded;

‐ Insulation: HEPR rubber, G7 quality, Pb free;

‐ Screen: plain copper wires with helically wound tape;

‐ Sheath: PVC based compound, Rz quality;

‐ Colour: red;

‐ Minimum installation temperature: 0°C;

Page 19.

‐ Recommended minimum bending radius: 12 times the cable diameter (350mm for 95sqmm and 50sqmm, and 300mm for 35sqmm);

‐ Recommended maximum tensile stress: 60 N/mm2 of the cross‐ section of the copper.

Cable will be suitable for installation in open cable trays or trenches. Cable will be also suitable for direct buried installation (not allowed in this project), also if not protected, complying with art. 4.3.11 of CEI 11‐17 standard. U0/U 12/20 kV, Umax 24kV.

b) Low voltage cable will be FG16OR16 0.6/1kV, for feeder cable to the outside load and main power connections inside substations, or FG17 for lighting, receptacles and small appliances inside the substations.

c) Grounding bare copper cord, minimum size 35sqmm, will be used to ground the metal frames of the medium voltage and low voltage switchgears enclosures, and metal fence and structure of the transformers. A copper cord of adequate section will be used for the transformer neutral ground. A rubber insulated, yellow‐green colored conductor sized 6sqmm will be used for the other metal masses inside the substations. The existing ground rods and inspection pits will be replaced and the ground cord protruding from the slab of the substation enclosures will be reconnected to the new rods.

4.6.2 Medium Voltage Switchgears

Medium voltage switchgears will be self‐standing metal‐enclosed, partition class PM, loss of service continuity LSC2 category, with the following features:

‐ Type‐tested according to IEC 62271‐200;

‐ Sealed pressure system with SF6 gas;

‐ Safe‐to‐touch enclosure and standardized connections for plug‐in cable terminations;

‐ 3‐pole, gas‐insulated switchgear vessel for switching devices and busbar;

‐ Switching devices: three‐ position switch‐disconnector (OPEN – CLOSED –

EARTHED);

‐ Switch‐fuse combination for distribution transformer protection, vacuum circuit‐breaker with three‐position disconnector;

Page 20.

‐ Switch‐fuse combination for distribution transformer protection, vacuum circuit‐breaker with Earthing function of switching devices generally make‐ proof.

Rated voltage kV 24 Rated short‐duration power‐frequency withstand voltage kV 50 Rated lightning impulse withstand voltage kV 125 Rated frequency Hz 50/60 Rated normal current of busbar A ≤ 630 Rated normal current of feeder A ≤ 630 Rated short‐time withstand current, 1 s kA ≤ 20 Rated short‐time withstand current, 3 s kA ≤ 20 Rated peak withstand current kA kA ≤ 50 Rated short‐circuit making current kA ≤ 50

Automatic circuit breakers will be provided with electronic digital relays with communication port for remote control:

‐ Time‐overcurrent protection (50, 50N, 51, 51N);

‐ Directional time‐overcurrent protection (67, 67N);

‐ Sensitive dir./non‐dir. ground‐fault detection (67Ns, 50Ns);

‐ Inrush restraint;

‐ Overload protection (49);

‐ Removable current and voltage terminal blocks;

‐ Binary input thresholds settable using DIGSI (3 stages);

‐ Current taps (1A/5A) settable using DIGSI;

‐ 9 programmable function keys;

‐ 6‐line display;

‐ Buffer battery exchangeable from the front;

‐ USB front port;

‐ 2 additional communication ports;

‐ IEC 61850 with integrated redundancy (electrical or optical);

‐ Relay‐to‐relay communication through Ethernet with IEC 61850 GOOSE;

‐ Millisecond‐accurate time synchronization through Ethernet with SNT.

4.6.3 Transformers

Transformers will be dry type resin insulated, F/F class, with the following main features:

‐ Primary voltage 15kV with tap changers, secondary voltage 400/231V, or

500V;

‐ Insulation class: medium voltage winding 24kV, low voltage winding < 1,1 kV;

Page 21.

‐ Connection: delta/star with neutral;

‐ Vector group: Dyn11;

‐ Frequency: 50Hz;

‐ Core made with insulated grain‐oriented magnetic steel foil;

‐ Encapsulated aluminum primary winding;

‐ Impregnated aluminum secondary winding;

‐ Bi‐directional rollers;

‐ Lifting lugs;

‐ Earthing terminal;

‐ No. 3 PT100 temperature sensors connected in a junction box;

‐ Electronic temperature monitoring unit;

‐ Data plate;

‐ Protection grade IP 00.

4.6.4 Low Voltage Switchboards

Low Voltage switchboards will metal enclosed, designed and tested in accordance with IEC 61439‐1/2 EN 61439‐1/2, form (internal separation) 2b, with the following main features:

‐ Rated operating voltage (Ue): Up to 690 V ‐ Rated frequency: 50/60 Hz ‐ Main busbar air clearance: Rated impulse withstand voltage (Uimp) Up to 12 kv ‐ Main busbar creepage distance: Pollution degree 3 Material group II Rated insulation voltage (Ui) 1000 V

Rated Current (In) Of (3‐Pole And 4‐Pole) Busbar System Main Busbars Rated current Up to 4000 A Rated peak withstand current (Ipk) Up to 220 kA Rated short‐time withstand current (Icw) Up to 100 kA, 1s

Main Busbar Arcing Fault Testing

In accordance with IEC 61641 Rated utilization voltage 400 V Rated short‐time alternating current 50 kA Length of internal arc 100 ms Length of internal arc with barrier 300 ms

Surface Treatment

Frame components, interior components Sendzimir‐galvanized Min. 20 μm Enclosure parts Epoxy polyester resin RAL 7035 Iron phosphating Thickness of coating Min. 70 μm

Page 22.

Insulation Class According to IEC 61140, EN 61140 I

Degree of Protection

According to IEC 60529, EN 60529 Ventilated IP30, IP31, IP40, IP41 Non‐ventilated IP55

Resistance To Mechanical Impacts

According to IEC 62262, Paragraph 9.6 IK08 Front frame with quick‐closing covers IK09 Top plate IK10 Door, side panel, rear panel

Operating Conditions:

Ambient temperature1) ≤ 35 °C Installation altitude ≤ 2000 m

Sheet Steel Thicknesses:

• Frame 2.5mm

• Enclosure 1.5mm

• Covers 1.0mm

Equipped with moulded case automatic circuit breakers, with electronic relays and communication port for remote control.

4.6.5 Automatic Power Factor Compensating Units

Power factor compensating units will be different type, fixed capacitors for compensation of the no‐load transformers power and automatic for the compensation of load reactive power.

‐ Fixed Power factor Compensating Units:

‐ Metallic enclosure internally and externally painted with epossidic dust paint, color RAL 7035;

‐ Load‐break switch with door interlock, designed at 1,495 in according to IEC 60831‐1 art.34;

‐ N07V‐K self‐extinguish cable according to IEC 20/22‐II and IEC 50627‐

2‐1 standards;

‐ IP3X degree of protection;

Page 23.

‐ Single phase self‐healing metallized polypropylene capacitors with Un=400V rated voltage, capacitors equipped with discharge resistors;

‐ Signal lamps power on;

‐ Rated operational voltage: Ue=400V;

‐ Rated frequency: 50Hz;

‐ Max current overload: In 1.3xIn;

‐ Max voltage overload: Vn 1.1xVn;

‐ Insulating voltage: 690V;

‐ Temperature range (capacitor bank): ‐5/+40°C;

‐ Temperature range (capacitors): ‐25/+55°C;

‐ Discharge device: on each bank;

‐ Use: indoor;

‐ Service: continuous;

‐ Capacitors connection: delta;

‐ Total Joule losses: ~ 2W/kvar.

‐ Automatic Power Factor Compensating units:

‐ Rated operational voltage: Ue=400‐415V;

‐ Rated frequency: 50Hz ± 1Hz;

‐ Max current overload In (capacitors): 1,3xIn (continuous);

‐ Max current overload In (capacitors): 2xIn (x 380s);

‐ Max current overload In (capacitors): 3xIn (x 150s);

‐ Max current overload In (capacitors): 4xIn (x 70s);

Page 24.

‐ Max current overload In (capacitors): 5xIn (x 45s);

‐ Max voltage overload Vn (capacitors): 3xUn;

‐ Max current overload In (bank): 1.3xIn;

‐ Max voltage overload Vn (bank): 1.1xUe;

‐ Insulating voltage (bank): 690V;

‐ Temperature range (capacitors): ‐25/+55°C;

‐ Temperature range (bank): ‐5°C/+40°C;

‐ Discharge device: on each bank;

‐ Use: indoor;

‐ Service: continuous;

‐ Capacitors connection: delta;

‐ Operation devices: capacitors contactors (AC6b);

‐ Total Joule losses: ~ 2W/kvar;

‐ Inner surface finish: zinc passivated metallic enclosure painted with epossidic dust paint, colour RAL 7035;

‐ Auxiliary transformer to separate power and auxiliary circuit parts

(110V);

‐ Load‐break switch with door interlock designed at 1,495In as per IEC 60831‐1 art.34;

‐ Contactors with damping resistors to limit capacitors inrush current;

‐ FS17 self‐extinguish cable according to IEC 20/22/II and IEC 50672‐2‐1 standards;

‐ Microprocessor Power Factor Correction relay;

Page 25.

‐ Single phase self‐healing metallized polypropylene capacitor with Un=415V rated voltage.

4.6.6 Communication And Remote Control System

Each substation will be provided with:

‐ 19” metal cabinet, wall mounting type, finish RAL 7016 anthracite grey, curved door with silk‐screen printed safety glass; Risers with adjustable depth 2 x 19”, Removable side panels; Rear cable input with knockout; Upper and lower cutouts for natural ventilation;

‐ 16xRJ45 + 4xFO SC ports Switch, IEC 61850‐3, IEEE 1613 (power substations), and EN 50121‐4 (railway applications) compliant, Built‐in MMS server based on IEC 61850‐90‐4 switch data modeling for power SCADA, Complies with a portion of EN 50155 specifications, Turbo Ring and Turbo Chain (recovery time < 20 ms @ 250 switches), RSTP/STP, and MSTP for network redundancy, VLAN Unaware: Supports priority‐tagged frames to be received by specific IEDs, Isolated redundant power supplies with universal 24 VDC, 48 VDC, or 110/220 VDC/VAC power supply range, ‐40 to 85°C operating temperature range;

‐ 12 FO SC connector patch panel;

‐ 12 RJ45 connector patch panel;

‐ FO and Cat6A FTP Patch Cords and structured cabling;

‐ Data concentrators for data gathering from circuit breaker relays;

‐ Gateway I/0 for connection to medium Voltage circuit breaker relays and low voltage circuit breakers relays;

‐ UPS for 19” rack, CEI 0‐16 compliant, with battery for 10 minutes of autonomy. The selected UPS is tropicalized, suitable for Marine ambient and shall be installed inside the communication Rack.

4.7 LIGHTING AND POWER DISTRIBUTION

4.7.1 PVC Conduit

Cables will run in heavy duty rigid plastic conduit, of the low toxic gas emission, self‐ extinguishing type, and minimum diameter 20 mm.

Page 26.

4.8 BOXES

4.8.1 Plastic Boxes

Boxes for rigid plastic conduits shall be fire resistant resin compound with press‐ work holed cover, low toxic gas emission, fixed to the box with cadmium plated screws.

4.8.2 Metal Boxes

Boxes for rigid steel conduits shall be metal die‐cast light alloy, or steel, complete with cover and four cadmium‐plated screws.

4.8.3 Wiring

Multicore cables will be FG16OR16 rubber insulated (similar to US Standard XHHW‐

2). Conductors for general wiring will be single core, FS17 type (similar to US Standard THHN), fire retardant, PVC insulated.