ASIR CPS EXTENSION PROJECT

PAGE

TCE CONSULTING ENGINEERS LIMITED

i30421008-3CL-00019-P0ADESIGN BASIS REPORT FOR LIGHTING AND SOCKET SYSTEMSSHEET OF iOF 4

SAUDI ELECTRICITY COMPANY

EASTERN OPERATING AREA

Dammam, Saudi Arabia

GENERATION EXPANSION OF RAFHA POWER PLANT

(CONTRACT NO :30421008/00)

DESIGN BASIS REPORT

FOR

LIGHTING AND SOCKET SYSTEMS

DOCUMENT NO. : 30421008-3CL-00019-P0A

OCTOBER 2004

ENGINEERING CONSULTANT

TCE CONSULTING ENGINEERS LIMITED

73/1, ST. MARKS ROAD

BANGALORE 560 001

INDIA

CONTRACTOR:

AL-TOUKHI COMPANY FOR INDUSTRY & TRADING

P.O. BOX 497, RIYADH 11411, KINGDOM OF SAUDI ARABIA

TEL. 00966-1-4633660 : FAX. 009661-4631150

CONTENTSCLAUSE No.DESCRIPTIONPAGE NO

1.0INTRODUCTION01

2.0OBJECT02

3.0REFERENCE DOCUMENTS & STANDARDS03

4.0DESIGN BASIS 04

5.0DESIGN CALCULATIONS FOR LIGHTING SYSTEM11

1.0 INTRODUCTION:

1.1 Al-Toukhi company for Industry & Trading has been awarded turnkey contract for Open Cycle Gas Turbine based CPS expansion project at Rafha of Saudi Electric Company-Eastern Operation Area (SEC-EOA), Saudi Arabia.

1.2 The project consists of design, engineering, procurement, installation, testing and commissioning of two (2) Nos. 29.92MW @ 50(C, Gas Turbine Generator unit of GE make along with associated Generator

2.0 OBJECT:2.1The scope of this document is to describe the Lighting and Socket systems proposed to be provided for different buildings and associated auxiliaries/facilities for the extension area completely.

3.0REFERENCE DOCUMENTS & STANDARDS

3.1IES Lighting Handbook

3.2National Electrical Code (NEC): NFPA 70

3.3National Electrical Safety Code: ANSI/IEEE C.2

3.4 SEC-ERB Engineering standard SES-P-119.25

3.5 Scope of work and Technical Specification PTS-1024

4.0DESIGN BASIS:

4.1Lighting system

4.1.1The lighting system shall comprise the following two (2) categories:

a)Normal 127V AC Lighting System

b)Emergency DC Lighting System

4.1.2 Normal 127V AC Lighting SystemIn this system, the lighting circuits shall be fed by normal AC supply through 3 phase, 4 wire lighting distribution boards. All the lighting fixtures connected to this system shall be available as long as supply is available from normal source through 480V/220V lighting transformer.

4.1.3 DC & Emergency Lighting Systemi)DC Emergency Lighting :

DC Emergency lights would be fed from DC emergency lighting

panel, which in turn will be fed from 125V station DC distribution

board.(DCDB)

These DC emergency lights would be provided in all rooms with

a facility for manual switching in each room.

Emergency lighting main supply would be automatically

switched on in the event of normal AC lighting failure.

ii)Exit Lighting :

Exit Light with self contained sealed lead acid rechargeable

standby batteries suitable for 90 minutes illumination and

charger circuit, connected to a dedicated 127Vac-branch circuit,

shall be provided near all the exit doors.

iii) Emergency Lighting

This shall be provided by emergency lighting fixtures located

strategically in critical operating area and emergency exits.

These lights shall be ON all the time, normally from the normal

AC supply. In case of failure of normal AC system, these lights

shall be energised from the DC supply obtained from integrated

rechargeable batteries through automatic switching. The change

over in the reverse direction will also be automatic. The duration of emergency lighting shall be 3 hours.

4.2Main Lighting Distribution Board(MLDB) and Sub Lighting Distribution Boards(SLDB)

4.2.1 The Main Lighting Distribution board would be provided with two MCCB controlled incomers and a MCCB controlled Bus coupler with Auto Changeover scheme. Both the incomers would be fed through 480V/220V dry type lighting transformers, Dyn11 with off circuit taps 5% in steps of 2.5%. The lighting transformer shall be cast resin dry type and shall be housed in the incomer panel.

The main lighting distribution board located in Main Switchgear building fed from the 480V Sub Distribution board consist of 2 nos of MCCB controlled incoming feeders and MCBs controlled 3 phase 4 wire outgoing feeders feeding Sub Lighting Distribution Boards(SLDB) for the following areas.

a) SLDB for Switchgear Room

b) SLDB for Control Room

c) SLDB for GTG hall

d) SLDB for Fuel tank area

e) SLDB for Outdoor area

f) SLDB for Street Lights

4.2.2 The Sub Lighting Distribution Boards (SLDB) shall have :

a)1 No. 3 phase 4 wire incoming feeder controlled by earth leakage circuit breaker and number of single-phase outgoing circuits controlled by MCBs. This feeder arrangement is used to feed all the indoor lighting system.

b) SLDBs feeding street lighting and outdoor area lighting will be provided with three phase outgoing feeder circuits controlled by MCBs.

SLDBs feeding the street lighting & outdoor area shall

be provided with contactors for control from a remote point. Automatic switching ON/OFF of these circuits shall be done through timers/photo cell.

4.2.3Lighting fixtures in indoor areas shall be controlled from the respective SLDBs.

4.2.3 Individual control in office rooms shall be through single pole flush type switches / MCBs.

4.2.5.The distribution of lighting fixtures/receptacles shall be such that the loading on each phase of the SLDB is approximately equal.

4.2.6 125V DC emergency lighting fixture would be fed through separate DC

emergency lighting panels which in turn are fed from 125V DC Distribution Boards.

4.3. The illumination levels required for various buildings in the plant viz.; GTG building, Main switchgear room, Battery room, & outdoor area/streets would be selected as per Cl.No: 6.20.15 of PTS-1022 page 251 of 336 as given below.

4.3.1 Illumination Levels:

Sl. No.Area/StructureAverage Illumination Level in LuxType of FixtureType of Luminaire

1Transformer yard20General Purpose Flood light Medium beam1 X 150W HPSV

2Outdoor areas20Weather proof, Dust proof medium beam150 W HPSV lamp.150W HPMV lamp

3GTG Power House

200Highbay Lighting fixtures suspended from structured ceiling members1x70 W/ 1x150 W HPMV lamp

4Switchgear room 300Industrial type with vitreous enamel reflectorEnergy Efficient FTL 2 x 40W

5.Control Room400Mirror Optic Recess mounted 2 x 40W , 3 x 40W FTL

6.Battery rooms200Acid Corrosion-proof Energy Efficient FTL 2 x 40W

7.Toilets, stairs, etc,.100Channel mounted box typeEnergy Efficient FTL 2 x 40W

8.Streets50Street light with clear acrylic cover cut-off type with integral mounted control gear1 x 250W HPSV

9.Fuel Unloading Pump Shed200Industrial type with vitreous enamel reflectorEnergy Efficient FTL 2 x 40 W

10Fuel Forwarding Pump shed150Industrial type with vitreous enamel reflectorEnergy Efficient FTL 2 x 40W

11.DC Emergency Lighting10Incandescent lamps60W, 125V DC

Note:The stack aviation lighting is not part of the DBR

4.3.2 The types of luminaires selected are based on the mounting height.

a) If the mounting height is equal to or less than 4 mtrs, then fluorescent type luminaires are selected.

b) If the mounting height is between 6 mtrs & 4 mtrs then the low bay type fixtures are selected.

c) If the mounting height is between 8 mtrs & 6 mtrs, then medium bay type fixtures are selected.

d) For all mounting height greater than 8 mtrs, high bay type fixtures are selected.

e) For street lighting, pole mounted streetlight type luminaires are used.

f) The street lighting pole height is maintained as 8 mtrs, and for area lighting, a pole height of 10mtrs is adopted.

4.4 Lamps & Luminaires:

4.4.1Outdoor lighting

i)High Pressure sodium vapour & High pressure mercury vapour lamp shall be generally outdoor weather proof and dust proof type with degree of protection IP 55 suitable for conduit mounting.

ii)The luminaire may be provided with integral mounted control accessories

4.4.2 Street Lighting Luminaires

250 watts High pressure sodium vapour lamps shall be provided with integral controlgear.

4.4.3 Fluorescent Luminaires

1.These luminaires shall be generally industrial type provided with cold rolled cold annealed (CRCA) sheet steel channel / rail cum reflector housing complete with all electrical control accessories mounted on it. The finish shall be stove enamelled.

2.Luminaires shall be suitable for the number of lamps of specified wattage (generally 1 or 2 lamps of 40W), direct mounting on ceiling / wall/ column pendant mounting.

3. Low loss electronic ballasts shall be provided for all fluorescent lamp luminaires.

4.4.4 Bulk head luminaire:

The luminaire shall be robust construction, cast aluminium / vitreous enamelled housing, heat and shock resistant prismatic or clear glass cover fixed with neoprene gaskets for sealing. For mechanical protection to the glass cover, round steel wire guard with vitreous enamelled finish shall be provided. The luminaire shall be suitable for incandescent lamp upto 150 watts, for direct mounting to ceiling / wall / column and is used for general-purpose indoor lighting.

4.4.5 Lamps

Lamps shall be capable of withstanding small vibrations and the connections at lead in wires and filaments / electrodes shall not break under such circumstances.

a)Incandescent lamps

General lighting service (GLS) lamps shall be tungsten filament incandescent type. The filament shall be coiled coil type rated for 127 volts, single phase AC.

b)Gas Discharge Lamps

(I)Fluorescent Lamps

Fluorescent lamp luminaires shall be with low wattage consumption, high efficiency and longer burning life.

Lamps shall be of warm white or cool day light type with triband phosphor coated type, suitable for operation on 127V, single phase AC, in standard lengths of 1200mm.

(II)High Intensity Discharge Lamps

These lamps include the high pressure sodium vapour lamp operating at 127V

High pressure sodium vapour lamps shall be with polycrystalline translucent, coated discharge tube, coated shell, quick restrike time (of within 5 minutes) in standard ratings upto 400 watts would be used.

4.5 Sockets (Power Receptacles)

4.5.1 One (1) number 3 phase, 480 V AC, 200A, outdoor power receptacle complete with male/female connector assembly with a fuse disconnect switch/MCCB housed in weather proof IP54 enclosure, shall be provided at the Main generator transformer bays for power supply to oil treatment/filtration equipment. This would be fed from 480V Station switchgear.

4.5.2 One (1) number 127V AC, 20A, galvanised finish IP54 weather proof steel clad receptacle/outlets with spring flap cover shall be provided on each lighting pole and transformer area for supplying power to inspection lamps. All these receptacles shall be fed from AC lighting panels.

4.5.3 Sufficient 480 V AC, 60A, 3 phase weather proof, IP54 welding receptacles shall be provided at approved strategic locations and within 30 meters from power transformers and shall be mounted on structure or equipment supporting columns. These shall be fed from the main LV AC distribution boards.

4.5.4 127V, 60 Hz, 3 pin Power Receptacles shall be provided in all building/areas of the plant. Inside a building, receptacles shall be provided at interval of 10-15m or part there of for hand tools, water coolers, exhaust fans etc. Inside each plant area, minimum two receptacles shall be provided and the same shall be indoor/outdoor as per the location. These receptacles would be fed from lighting panels.

4.5.5 Receptacle units shall consist of socket outlet with associated switch and plug. The socket outlet and switch or MCB shall be flush mounted within a stove enamelled/ galvanised 1.2-mm thick CRCA sheet steel enclosure. The box may be recessed into or mounted on a wall/column made of RCC, brick, or steel as per the location in a standard arrangement.

4.5.6 The outdoor type receptacles shall be housed in a 2 mm thick CRCA sheet steel epoxy painted enclosure with gaskets, hinged door having locking arrangement. The enclosure shall be with rain canopy and removable gland plate entry from bottom. Composite receptacle with switch modules housed in a box shall be with degree of protection IP 54

5.0DESIGN CALCULATIONS FOR LIGHTING SYSTEM:

5.1Indoor Lighting

The recommended values of illumination level for various areas in the plant as indicated would be followed for estimating the number of lighting fixtures. Following factors would be considered while arriving at the utilisation factor to determine the number of fixtures for each area/buildings in the plant.

Maintenance Factor:

(a)Air conditioned clean interiors like

office rooms,

: 0.8

(b)Industrial areas with normal interiors such

GTG hall

: 0.7

(c) Industrial areas with dusty interiors

: 0.6

such as fuel oil forwarding & Unloading sheds

Reflection factor for wall/ceiling

(a)White and very light colours

:0.7

(b)Light colours

:0.5

(c)Middle tints

:0.3

(d)Dark colours

:0.1

The reflectance of the floor, wall, & ceiling would be taken based on the type of floor, roof, & ceiling finishes present in the respective buildings

The working plane would be considered at 0.85 m from the floor level.

The suspension height for suspended fixtures would not exceed 1 meter.

The emergency lighting system shall provide average maintained illumination level of 10 lux measured at the floor.

5.2Outdoor Lighting

The recommended illumination levels for outdoor areas are 50 Lux for roads, 20 for transformer area.

Mounting height, spacing of area/street lights shall be based on lamp wattage, uniformity of illumination and vertical angles.

Maintenance factor shall be generally 0.6 under average conditions.

For outdoor lighting i.e. around the buildings provision to be made with 150W outdoor type flood light type lamps mounted on wall.

Automatic switching ON/OFF shall be through timers/photo cells.

5.3Calculation for Number of fitting The following formula per lumen method shall be used for general lighting to estimate the quantity of fixture (N) needed to illuminate the indoor areas:

N=Emaintained x Workplane area

Lamps per luminaire x LL x CU x LLF

Where,

N=Number of luminaries or, fixture

E=illumination

LL=initial rated lamp lumens

CU=coefficient of utilisation

LLF=Light-loss factor (i.e. LLD x LLD x Ballast factor)

LLD=Lamp Lumen Depreciation

LLD=Lamp Dirt Depreciation

Alternatively, Sub vendors software would be used for calculating the number of fixtures and the outputs of the software would be furnished along with the layouts.

5.4Lighting circuit designIn an area, the lighting fixtures would be arranged in different phases such that even in case one lighting phase is faulty, complete lighting is not affected.

The circuit loading on each circuit shall be restricted to 80% of the MCB rating.

The voltage drop from SLDB and any fixture shall not exceed 3%.5.5Wires, cables, conduits and junction boxes

5.5.1Conductor size for power receptacles and lighting circuits shall be selected taking into consideration the voltage drop (as indicated above), but in no case it shall be less than 4 mm2 stranded copper.

5.5.2Wires used for conduit point wiring of lighting fixtures/exhaust fans and receptacles shall be 1100 V grade, PVC insulated, single core, stranded copper conductor wires. In general, concealed wiring would be adopted for Main switchgear building, etc. where RCC structure exists. For GTG building etc. where steel structures are present, exposed conduits would be used. Pull boxes would be provided near light fittings & where conduit drops down to switch box.

5.5.3All conduit wiring, concealed or exposed wiring shall have provision for easy inspection. Exposed wiring when run along wall would be as near the ceiling as possible. Due consideration would be given for neatness and appearance.

5.5.4Wires of different phases would be run in separate conduits. However, wires of same phase but having different circuit nos. can be run in same conduit. Wires of lighting and 3 phase power receptacles shall be carried out in separate conduits and on separate circuits.

5.5.5Wherever lighting system has three phase distribution, separate conduits would be used for different phases. For easy identification of phases and neutral wires the following colour wires shall be used.

i)R - Phase

-Red

ii)Y - Phase

-Yellow

iii)B - Phase

-Blue

iv)Neutral

-Black

5.5.6All receptacles and switches to be installed in offices buildings would be flush mounted within the wall and those in other areas would be wall or column mounted.

5.5.7Rigid PVC/galvanised sheet steel junction boxes with adequate number of outlets/ways, suitable of the conduit entry would be provided in the circuits wherever required. Grounding screw shall be provided in each junction box.5.5.8In Main switchgear room the wires would be routed through Rigid PVC conduits of minimum 25mm size concealed in wall.

5.5.9GTG building and in other steel structured area the wires shall be routed through Rigid galvanised steel conduits of minimum 25mm size installed on wall surface/structures/ceiling surface.

5.5.10The cables shall be routed through duct banks/ cable trenches inside buildings as best suited. Outside, the cables shall be directly buried at 900mm below FGL, At the road crossing, these cables shall be routed through 110mm dia. PVC conduits (directly buried at a depth of 750mm). Warning tile & tape shall be provided at 300mm above the cable.

5.6Earthing

All exposed metal parts of the plug, when the plug is in complete engagement with the socket outlet, shall be in effective electrical connection with the earthing pin.5.7Mounting

Socket outlets & welding receptacles shall be mounted at 750mm from FFL.

5.8Light Control Switches

Light control switches of ratings and types, i.e. decorative/industrial, shall be used. The switches shall be suitable for use on 220/127 V, 1 phase, 60 Hz supply.

Switches shall be of flush type for mounting behind an insulated plate or incorporated with a switch or switch box/suitable enclosure. The switch box/ enclosure may be recessed into or mounted on wall as per the requirements of project layouts.

Lighting switches and receptacles shall be modular type.Light control switches where applicable, would be mounted at 1500mm from FFL.Normally, lighting fixtures would be controlled from SLDBs except in office room, where light control switches would be provided to control the light fitting in that room.. EMBED Word.Picture.8

P0A

29-10-2004MPSR

REV NO . DATEPREPARED BYCHECKED BYCLEARED BYAPPROVED BY

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