Attachment_1_Amendment_1_PWS_English_Version.pdf

SOLICITATION : W564KV-16-B-0012

PROJECT : R-CH-O2D-15123-15

TITLE :Renovation of Bldg #20041– CAB

AMENDMENT #01

Here below the description of lightning protection system and surge protection devices to be added in the specifications at item 2.1.2 Reconstruction of ground floor in the building at page 39.

LIGHTNING PROTECTION SYSTEM AND SURGE PROTECTION DEVICES

Overview

This project consists of the dismounting of the existing lightning protection system up to the earthing disconnection points and the construction of a new LPS.

According to the risk analysis (in compliance with norm IEC 62305), the building must be equipped with a class III lightning protection system. The lightning protection system must comply with norm IEC 62305.

The sensors on the roof are made of a conductors network. From this network on the roof, cables run down to the existing ground connections.

All metallic parts, such as frames, downspouts, structure elements, etc… located at a distance less than one meter away from a down conductor must be connected to it. All watertight crossings (watertight crossing of the roof by means of appropriate crossing sleeve) must be perfectly repaired and are included in this contract. All connections to the down conductors must be crimped or swaged.

All curving down cables must have the widest possible curve radius.

The lightning protection system must be carried out by a firm certified for lightning protection systems, category T2, and must be approved by a certified firm.

The system will include:

collectors conductors fixations connections connections with metallic parts on the roofs down cables

Regulations

Once the work is completed, the contractor shall submit a certificate issued from a recognized organization attesting that the installation is conforming.

If, in accordance with the IEC62305 provisions, the specifications must be modified, the contractor shall have to perform all required works within the frame of both specifications and contract without any additional cost.

Material and Performance

The installation mainly consists of a pick-up installation to capture the lightning's direct impact and of a grounding installation to redirect the current to ground. Within a well conceived installation, the object to be protected is always in the zone secured by collectors; for this reason, the pick-up installation is performed in a way that, during a direct lightning strike, the risk that it might not be picked-up by this installation is reduced to a strict minimum.

The installation redirects the lightning is conceived to avoid any danger inside the building.

Collectors are planned in sufficient number and at locations where the risk of a lightning strike is the greatest, such as on projecting parts.

Collector points

The collector points are made of aluminum 50mm2, the height will be determined by the contractor.

The prominent metallic parts which could be considered as collectors do not require a collector point.

They need to be connected with the whole installation. The other non metallic parts of the roof require collectors.

Conductors

Conductors are made of solid aluminum, galvanized conductors with min. 8mm diameter and will be in conformity with EN50164-2 regulations.

Conductors are placed in whole lengths as much as possible and to obtain the most rectilinear arrangement possible. Conductors with a length greater than 25 meters have an extended piece to remain straight in case of shrink or expansion due to varying temperatures.

Fastening methods

Horizontal or vertical conductors are attached with fasteners appropriate to the building structure and are planned every 1.00 m by means of a system to be submitted to the C.O.R. for approval.

On masonry in white or blue stone or similar material, conductors will be fixed with brass fasteners using plugs and screws in aluminum or stainless steel and keeping the conductors within 5mm of the surface to avoid shadow effects.

On the roof valleys and rafters, brass fasteners are attached with screws of appropriate length and lead washers.

On flat or inclined roofs or zinc troughs, fasteners are attached by soldering. In no case will the cover be perforated.

Conductors can slide easily with expansion during temperature changes without the fasteners being subject to tensile forces.

Fasteners have been chosen in order to avoid galvanic pairs, electrochemical corrosion or dirtying of the surfaces.

Connections

Running-down conductors are in one length; those fixed to the roof are as long as possible to avoid connection resistances.

Connections are necessary to connect the meshes with the running-down conductors and to join the different conductors to the mesh.

Connections must guarantee a good conducting contact and must not come loose. The connections must have a tensile strength of 2 kN.

All connections must be protected against corrosion and oxidation and must be performed in identical material and be easily accessible for maintenance.

Connections will be made by hydraulic pressure with a 12-ton working force or by welding over a min.

distance of 5cm

Connections with metallic parts

All interior or exterior metallic parts located at a distance less than 3m from the installation will be connected to it. The distance to be taken into consideration is 1m for buildings with a height < 25m.

If the metallic parts have a vertical profile of more than 4m, the highest and lowest points will be connected to the installation.

These requirements do not apply to electrical conductors or to metallic parts encased in concrete or cement.

Metallic parts placed on the roof must be connected to ground at more than one place.

Metallic masses with several bad contacts / connections to the installation will be bridged so as to avoid risks of damage.

Connection to the metallic parts can be done through aluminum cable shoes or other connections having good electrical conductivity.

Particular attention will be given to the execution of connections on zinc roofs, copper-zinc trays and copper-zinc downspouts.

Downspouts will be connected to the conductors at their top and bottom parts.

Isolating links on each down conductor at ground level exist and are connected to earth rods or ring;

Surge protection devices

The surge protection devices are set in each main panel.

Each device includes, according to the manufacturer’s technical prescriptions, its individual protection by fuse or circuit breaker.

For each panel with a surge protection device, a LED type red signal located on the door of the concerned closet or box will report any fault. This signal goes with an engraved plate telling its function: “FAULTY SURGE PROTECTION DEVICE”.

The grounding will be TN-S.

Their conception and selection comply with following norms:

CEI61312: Protection against electromagnetic impulse due to lightning

CEI61643-1: Protection devices against surge connected to low tension distribution systems – part 1:

Functioning prescriptions and testing methods.

CEI61643-12: Protection devices against surge connected to low tension distribution systems – part 12: Principles of selection and use.

Surge arrestors Type 1

SPD type 1 according to EN 61643-11.

SPD Class 1 according to IEC 61643-1.

For protection of low voltage consumer's installations against surges, even at direct lightning strikes. For use according to the lighting protection zones concept at boundaries 0A -2.

Prewired combined spark gap based arrester.

No tripping of 32/35 A gL/gC fuses up to short circuit currents of 50 kArms Lightning current discharge capacity up to 100 kA (10/350).

Allows protection of terminal equipment.

Type 1 to be installed in MDP.

Technical specifications

SPD according to EN 61643-11 Type 1 SPD according to IEC 61643-1 Class 1 Classification according to E DIN VDE 0675-6 B Nominal ac voltage Un 230 / 400 V Max. continuous ac voltage Uc 255 V Lightning impulse current (10/350)(L1+L2+L3+N-

PE)

100 kA

Lightning impulse current (10/350) (L, N-PE) 25 kA Nominal discharge current (8/20) 25 /100 kA Voltage protection level (L-PE) ≤ 1,5 kV Voltage protection level (N-PE) ≤ 1,5 kV Follow current extinguishing capability ac 50 kA rms Follow current extinction / Selectivity No tripping of a 32 A gL/gG fuse up to 50 kA rms (prosp) Response time tA ≤ 100 ns Max. backup fuse (L) up to Ik = 50 kA rms 315 A gL/gG Max. backup fuse (L) at Ik > 50 kA rms 200 A gL/gG Max. backup fuse (L-L') 125 A gL/gG TOV voltage (L-N) UT 335 V / 5 sec.

Operating T° range (parallel wiring) Tup -40°C …+80°C Operating T° range (through-wiring) Tus -40°C…+60°C Operation indicator Green light Cross-sectional area (L1,L1',L2, L2',L3,L3',N,N',PE) min

10 mm² solid / flexible

Cross-sectional area (L1,L2,L3, N, PE) max 50 mm² stranded / 35 mm² flexible Cross-sectional area (L1',L2',L3',N') max 35 mm² stranded / 25 mm² flexible Mounting on 35 mm DIN rail acc. to EN 60715 Enclosure material Red thermoplastic, UL 94 V-0 Degree of protection IP 20 Dimension 8 mods., DIN 43880 Approvals, Certifications KEMA, VDE

Surge arrestors Type 2

SDP Type 2 according to EN 61643-11.

SDP Class II according to IEC 61643-1.

For protection of low voltage consumer's installations against surges.

For use in the lightning protection zones concept at boundaries 0B-1 and higher.

Type 2 to be installed in all secondary cabinets.

Technical specifications

SPD according to EN 61643-11 Type 2 SPD according to IEC 61643-1 Class II Classification according to E DIN VDE 0675-6 C Nominal ac voltage Un 230 / 400 V Max. continuous ac voltage Uc 275 V Nominal discharge current (8/20) In 20 kA Max. discharge current (8/20)Imax 40 kA Voltage protection level Up ≤ 1,25 kV Voltage protection level at 5 kA Up ≤ 1 kV Response time tA ≤ 25 ns Max. mains-side overcurrent protection 125 A gL/gG Short circuit withstand capability at max. mains-side overcurrent protection

50 kArms

TOV voltage UT 335 V / 5 sec.

Operating T° range Tu -40°C …+80°C Cross-sectional area min 1.5 mm² solid / flexible Cross-sectional area max 35 mm² stranded / 25 mm² flexible Mounting on 35 mm DIN rail acc. to EN 60715 Enclosure material Red thermoplastic, UL 94 V-0 Degree of protection IP 20 Dimension 4 mods., DIN 43880 Approvals, Certifications KEMA, VDE, UL Type of remote signalling contact -- Switching capacity ac -- Switching capacity dc -- Cross-sectional area for remote signalling terminals --

As-built folder

After performing the installations, revised "as-built" drawings will be provided in the same time as the table with the measured resistance values.

Verification must be done by a registered verification office after the completed performance of the installation.

This written report will certify that the installation conforms to applicable standard.

Upon provisional acceptance of the work, a guarantee covering defects in material and workmanship will be provided. This guarantee will cover a period of 10 years.

The work described in this amendment consists of the following:

1. Add horizontal supports as described in item TP-8-01&02 of the specifications. During the execution of the work, we have noted that the existing horizontal supports were not well anchored to the structure. We have therefore decided to put new ones.

2. Repair of the reinforced concrete beams under the new translucent panels: during the dismounting, we noticed that, at some locations, the reinforcement bars of the reinforced concrete were visible and needed to be repaired.

3. Repair of the water tightness of the eave gutter on the North side: for one year, bubbles have formed below the water tightness in the eave gutter, preventing rainwater from running off properly.