LIGHTING SYSTEM FOR SUBSTATIONS

 LIGHTING SYSTEM FOR SUBSTATIONS

Electrical Installation

 

Distribution Board

 

A.C Permanent Distribution Board

Main lighting board with enough capacity and 25% spare equipped feeder shall be  provided, C.B selected to be  adequate for the load including the 25% spare feeder. It shall be flush/semi flush-mounted in the A.C room/control room. This board shall feed sub –distribution boards located at different areas for local control of the lighting.

 

L.V. sub-distribution boards with rated insulation level 1000 V. it shall be flush mounted metal-clad assembly enclosure design with thickness not less than 1.5mm with lockable front door and in accordance with IEC 439 with a degree of protection IP54, the board shall be provided with a copper busbar and circuit breakers with the required rated current, breaking capacities, and also provided with indication lamps.The main circuit breaker shall be provided with earth leakage relay to initiate a sound alarm and visual signal on the board. Separate neutral and also separate protective earthing busbar with the same cross-section of the phase busbar, the neutral busbar shall be isolated from the enclosure of the board but shall be connected to protective earth with one link in the board only the protective earthing wire shall be connected to the main grounding system. Only one the conductor may be connected to one terminal, adequate space on the board for the connection of cables shall be provided.

 

Fixtures

 

 Component of Fixtures

Component of Fluorescent Fixtures :

-           Tubular Fluorescent Lamps :

Tubular fluorescent lamps shall comply with IEC 60081 & its rate is (40 watt)

-           Ballast :

Ballast for fluorescent lamp shall comply with IEC 60921, it shall be metal enclosed with a protection code IP20, and the coil shall be cast-resin impregnated (electronic ballast).

-           Starter :

Starters for fluorescent lamp shall comply with IEC 60155 .starter shall be provided in a plastic enclosure and it shall be for an ignition temperature range from -20° to +80°.

-           Capacitors :

Capacitor shall comply with IEC 61048,61049 it shall be installed for a fluorescent lamp for power factor correction to approximately (0.95 to 1.0) the capacitor shall be provided in an Aluminum enclosure .

 

Conduits & Conduit Fittings

 

PVC conduits, its accessories (Embedded Wiring System)

-           The PVC conduits shall be rigid, the conduits and conduit fittings shall be so designed and manufactured that they ensure reliable mechanical protection to the cables contained therein, and shall withstand both stresses and high temperature (up to 85°C)           liable to occur during transport, storage, and installation. The material shall not soften or suffer any structural degradation at a high temperature of up to 85°C .

 

-           The PVC conduits and conduit fittings shall be suitably marked and identified by

 the manufacturer.

All markings shall be easily legible and shall include the nominal sizes. The inside and outside surface of conduits shall be smooth and free from burrs, flash, and similar defects.

-           The percentage conduit fill shall not exceed 40% of the conduit cross-section area.

 

Molded Plastic Outlet Boxes :

 

-           Boxes and covers used with PVC conduit system are to be heavy gauge pressure molded plastic, minimum 2mm thickness.

            Self-extinguishing, with softening point not less than 85°deg.

-           Pull & junction boxes shall be suitable for use in conjunction with the selected raceway systems. Boxes in wet location and boxes installed outside shall be jacketed .

Plastic Plates :

Heavy gauge, break-resistant, pressure molded plastic, white or ivory color.

 

Wires & Cables

 

General :

-           Wires and cables shall be fabricated of the solid or stranded copper conductor in accordance with IEC 60228.

Light circuits shall be wired in not less than 3mm² cables and power circuits shall be wired in not less than 4mm² cables.

-           Different circuits for power sockets in the same room shall be fed from the same phase for safety provision.

-           The insulation of all wires and cables shall be rated for at least 85 deg °C for polyvinyl chloride (PVC) and 105 deg°C for thermoplastic. Polyethylene (PE) cables .

-           The identification by color in multicore wires and cables shall   comply with IEC 60446.

 

Wires :

 

-           Wires are single-core insulated multicore insulated and sheathed conductors which are used only for light-duty indoor applications. The conductor

 

Wires :

 

-           Wires are single-core insulated multicore insulated and sheathed conductors which are used only for light-duty indoor applications. The conductor insulation and the sheath shall be polyvinyl chloride (PVC) and shall be rated for 0.6/1 k.V, and shall comply with IEC 60189.

 

Cables :

 

-           Cables for power and lighting for indoor use shall be unarmoured with a separate earth conductor. For outdoor installation, armored cables laid on cable trays, and in case of road crossing steel pipes shall be used.

-           The conductor insulation and the sheath shall be polyvinyl chloride (PVC), shall be rated at least for 0.6/1k.V, and shall comply with IEC 60227.

Identification of conductors by colors

The preferred color scheme to be used to identify the cores of a flexible cable or cord is:

a)         Three-core cable or card: either green or yellow, light blue, black or light blue, black, brown.

b)         Four or five cores cable or cord:

Either green/yellow, light blue, black, brown, and for the fifth core, black or brown.

 

Earthlings

 

-           Neutral and protective earthing busbars shall be connected directly to the earthing grid.

-           A separate protective earthing conductor shall run along with all feeders and where all frames of apparatus and junction boxes shall be connected to.

This conductor shall be insulated by yellow-green colored PVC or it shall be marked in all connection points by yellow-green tape.

-           All installation shall be connected to the main earth grid system.

-           Unless the otherwise mentioned earthing system is the contractor's responsibility to be as per standard specification.

 

Cable Trays

 

-           All component, accessories, and supports shall be made of hot-dip- galvanized steel, bordering shall be edge protection. All cable trays shall be earthed with a copper conductor.

-           All cables shall be laid in only one layer & it should be supported with special ribbons.

-           Space factor doesn't exceed 50%  i.e. the C.S.A for cables does not exceed 50% from the cable tray section .

-           Distance between each two cables shall be not less than twice the        diameter for the biggest one for cable 3* .

-           The minimum load capacity shall be :-

            200mm - 150 kg/m                   

            300mm - 175 kg/m                   

            400mm - 200 kg/m

            500mm - 220 kg/m

            600mm - 240 kg/m

-           The regular supporting distance shall be 1500 mm .

 

Circuit Breakers

-It shall be provided with thermal and magnetic overcurrent tripping devices.

- Each circuit breaker shall have an interrupting capacity higher than the maximum available short circuit current at the supply terminal & shall be in accordance with IEC 60947-2.

-All C.B's shall be in accordance with IEC 60947-2 .

-Main circuit breakers shall be provided with earth leakage protection and it shall be provided with remote signal contact for circuits of control, signal, measuring, and protection.

 

MARKING

 

Rating plates, labels, and other markings shall be clear and indelible. The rating plate shall be made of stainless steel and shall have the order number and the year of manufacture in both Arabic and English.

TESTING AND INSPECTION

-           Testing

            General

All panel and distribution boards shall be tested at the supplier’s expense in accordance with the latest edition of the referenced standards. Following completion of the tests, two certified copies of the test report shall submit to the purchaser for approval. No equipment shall be supplied until the test reports have been approved by the purchaser.

 

            Validity of Test Certificates

Test certificates are considered valid if the tests have been carried out within the last five years on equipment similar to that on offer using the test methods outlined in this specifications.

 

            Location of Tests

Routine tests shall be carried at the supplier’s factory.

Type tests shall be carried out at an approved independent testing laboratory or at the supplier’s factory and be witnessed by a representative of an approved independent test laboratory or other representative acceptance to the purchaser.

 

-           Inspection

 

The purchaser may wish to witness a test or to visit the factory during the manufacture of any or all items covered by this specification. Accordingly, the supplier shall give the purchaser adequate notice of manufacturing schedules and one month’s notice of test schedules.

 

 

-           Type Tests

 

-           The type shall be carried out according to the latest edition of IEC.

-           Any particular unit or units may at purchaser section be chosen for testing.

 

Routine Tests

 

-           Each complete panel assembly shall be tested according to the referenced IEC standards.

-           All wiring shall be tested with a 2000V megger insulation tester.

 

SAMPLING

 

            Each complete distribution board assembly shall be testedز.

 

METHOD OF TEST

 

            Testing shall be carried out in accordance with the latest IEC standards.

 

ACCEPTANCE AND REJECTION

 

            The supplier shall forward to the purchaser, three copies of the certificate proving that all tests required have been carried out and also samples & catalogs of the equipment used.

 

DELIVERY

 

            PACKING AND TRANSPORT

            Equipment shall be delivered ready for service.

 

GUARANTEE

 

            The supplier guarantee the delivered equipment against manufacturing, design and material defects for a period as given in the tender documents.

SUBMITTALS

Drawing, calculations, and catalogs for the specified items of material to be supplied under this section. Other submittals listed hereunder shall include but not limited to the following :

- Reference list of all the components.

- The arrangement of the AC sub-distribution boards.

- Different types of light fittings, lamps, switches, and sockets.

- Detailed design and calculations of the lighting system.

- Cable routes and cable sizing.

- Erection drawings.

 

REFERENCE LIST

 

            The tenderer shall submit a reference list that the proposed equipment have been in successful operation in an integrated system on three different substations of same or higher capacity outside the country of the manufacturer and/or in EEHC network during the last ten years. The experience of manufacturer and the sub-manufacturer shall be evaluated on the above basis.