SINGLE BUS BAR ARRANGEMENT

This is the simplest switching scheme in which each circuit is provided with one circuit breaker. This arrangement offers little security against bus bar faults and no switching flexibility resulting into quite extensive outages of bus bar and frequent maintenance of bus bar isolator(s). The entire SubStation is lost in case of a fault on the bus bar or on any bus bar isolator and also in case of maintenance of the bus bar. Another disadvantage of this switching scheme is that in case of maintenance of circuit breaker, the associated feeder has also to be shutdown

Exothermic welding installation guide

Here is a guide for exothermic  welding system

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Shock indicator for new materials

Protect-A-Pak is a single use shock indicator that can be attached to the item being shipped or inside of shipping boxes via a self-adhesive backing. Protect-A-Pak is composed of a cylindrical plastic casing containing two springs, each of which is fitted between two steel balls. These springs are designed to withstand a specific rated g-force. If the acceleration exceeds the rated force, the two balls detach from the axis affected and fall into the plastic casing. As the springs are fitted at a 90 degree angle, each Protect-A-Pak can monitor two axes. A label on the outside of the packaging shows the shipper that an impact indicator is being used.

High voltage Transmission line bending due to a sand storm in Egypt

 A sand storm caused a totally bending  in a high voltage  transmission line in  Egypt .

Cable reels specifications (part 2)

• When lifting cable reels by crane, a steel shaft of proper length and diameter shall be placed through the reel drum spindle. The steel shaft shall be threaded at both ends and provided with circular plates and retaining nuts to prevent the reel from falling in case of accidental tilt during the lifting process
• When rolling a cable reel from one location to another, care shall be taken to remove any objects on the surface area that might contact the cable surface. The marked rolling direction must be followed to prevent the cable layers from becoming loose
• The cable storage site shall be an elevated flat surface and must not be reached by flood or sea water
• Reels shall be stored on a solid support or hard and regular surface that will not allow the flanges to sink into the earth.
• Storage areas shall be free of construction equipment, flying or falling objects, chemical or petroleum spill or sprays, open fires or other heat sources and far from heavy vibration areas.
• The conductor or ground wire in reel shall be protected by wood lagging to prevent damage. The conductor reels are set or stored on ground blocking. It is advisable to store the different types of conductors in separate locations. Blocking shall be used to prevent movement or rolling of reels. When the conductor or ground wire is not protected by wood lagging, in no case, shall the blocking touch the conductors or ground wire.

Source SEC standard

SEE previous article 

cable reels specifications (part 1)

·         Cable reels shall be stored and maintained in a proper manner. Cable reels shall be shipped with adequate physical protection to ensure that they can be stored in an outdoor environment for the period of time between arrival and installation

·         All shipping reels for LPOF, EHV & HV cables shall be made of steel. Reels for MV cables Shall be made of steel or wood. Steel strapped wooden lagging is required in all cases. The LPOF cable reels will include a shipping/storage oil pressurization system for the testing and maintaining of proper oil pressure on the stored cable.

·         LPOF cables, when prepared for shipment shall be subjected to expulsion test to check the entrapped gas as per AEIC CS4. Figure 02-06 shows the expulsion test panel

·         When the LPOF cables are completed and ready for shipment, samples of oil shall be taken from each length of cable as per AEIC CS4 to determine the dielectric strength of oil samples.

·         The selection and use of the proper equipment and tools used in cable reel handling is essential. A thorough knowledge of the capabilities of equipment, cable reels weight and physical dimensions are required prior to moving or loading the cable reels

·         For XLPE cables in reels, the inner end and the outer end shall be sealed with heat shrinkable end cap after attaching a pulling eye to the conductor. This sealing method will prevent ingress of moisture into the cable.

·         Care on reel deterioration should be taken if cable are to be stored for extended period. Wooden reels shall be stored on concrete base or on raised wooden stringers placed under the reel flanges.

·         Cable reels shall be stored in an upright position only. Laying cable reelson their flat sides are not allowed.

To be continued

Source : SEC standards

ELECTRICAL ENGINEER JOBS IN INDIAN RAILWAY

jobs for Electrical Engineers in India just apply &  mention your  friends

SF6 GAS Environmental impacts

SF6 GAS  Environmental impacts

The reduction of the size of the switchgear, compared to conventional designs (open type and metal-enclosed air-insulated switchgear) allows a reduction of material required. In general the reductions are usually very important not only in structural materials but also in solid insulating materials and electric conductive active parts.

In the other hand the use of SF6 switchgear, requiring less dimensions of busbars and electric conductive active parts of the switching devices will reduce the energy Losses by Joule effect in the switchgear itself.

 At the same time, the possibility of installing the compact equipment closer to the load demand, makes the network itself more efficient reducing the losses. This is, therefore, an indirect reduction of energy use by the application of SF6 switchgear in the network.

pulling power transformer

Preparation for pulling of 67 MVA power transformer

to be continued

cable ladders and trays in substations

• Metallic cable trays shall have suitable strength and rigidity to provide adequate support without undue sag and shall not have sharp edges, burrs or projections that can damage the cable insulation or jackets

• Cable tray shall be designed to provide a minimum of 20 % spare space

• Cable tray deflection shall be restricted to a maximum of 12 mm for all span lengths. Technical details to arrive this term shall also be furnished.

• Cable tray shall be supplied with suitable rubber bumpers at locations of

• safety hazards.

• Cable tray shall be fabricated either from corrosion resistant metal such as aluminum alloy or carbon steel with corrosion resistant coating such as zinc coatings

• Ladder tray shall be prefabricated structure of two longitudinal side rails connected by individual transverse members (rungs) with openings in the longitudinal direction. Spacing of rung shall be 150 mm per NEMA VE-1. When the number of cables to be accommodated per tray is less, then spacing of rung can be 225 mm or 300 mm per NEMA VE- 1

• Fitting is a device, which is used to change the direction in either horizontal or vertical planes, or size of cable tray system. Fittings shall be of the same material as the straight section part of the cable tray. The manufacturer shall supply all fittings as required.

To be continued 

starting for digging a transmission lines

Starting digging a new  transmission lines .... Electrical Engineers Doing hard job

Human resources email addresses for KSA companies

3  career@safari.com.sa 2 info@cristalarabia.com 1 IT@mobily.com.sa   info@aswadgroup.com 6 info@sapac.com.sa 5 support@ipowerweb.com 4 siec@siec.com.sa 9 info@aswadgroup.com 8 CV@ardco.com.sa 7 Mardig@samir-photo.com 12 tifajob@yahoo.com 11 careers@akte.com.sa 10 info@petrominoils.com 15 jobs@aecl.com 14 Chaoul@samir-photo.com 13 Jobs@aas.com.sa 18 mrasing@kfshrc.edu.sa 17 careers@almarai.com 16 admin@umc.com.sa 21 info@saudichamber.org.sa 20 hrsaudi@jatco.com.sa 19 natel@natel.com.sa 24 admin@saudifal.com.sa 23 jkawamoto@mdbio.org 22 hrdept@alsalamircra ft.com.sa 27 jobs@nasco.com.sa 26 HRD@stesa.com 25 jobs@econcepts.com.sa 30 Recruitment@ saib.com.sa 29 careersaudi@ sls.com.sa 28 info@wec.com.sa 33 resumes@deemah.com 32 jobs@acssco.com 31 info@alarkan.com36 careers@qcc.com.sa 35 career@alharbitelec om.com 34 info@areeco.com 39 CKT41317@biglobe.ne.jp 38 cv@alrajhibank.com.sa 37 intertech@intertech-pal.com 42 info@almultaka.com.sa 41 g_m@alumaco.com 40 asdp@sdt.com.sa 45 comment@chevron.com 44 sami@suhuf.net.sa 43 s_hoshan@alsalamair craft.com.sa 48 recruitment@ kjo.com.sa 47 webinfo@tadawul.com.sa 46 cfo@alsalamaircraft.com.sa 51 info@arabexperts.com 50 rcgc@riyadh-cables.com 49 sales@somac-it.com 54 maaden@maaden.com.sa 53 almady@sabic.com 52 ses@saudico.com.sa 57 ayalkhiary@arcom.com.sa 56 support@somac-it.com 55 info@saparabia.com 60 HR@sipchem.com 59 sesdam@nournet.com.sa 58 info@ncsc.com.sa 63 info@keylink.com 62 info@elm.com.sa 61 dabbaghae@maaden.com.sa 66 ceomail@nscsa.com.sa 65 general@nic.com.sa 64 siec@siec.com.sa 69 info@mis.com.sa 68 ceo@se.com.sa 67 sales@natmetalco.com 72 daghameen@natcom.com.sa 71 info@arabsea.com 70 info@newera.com.sa 73) akam@arabia.com 76 alajmico@saudionlin e.com.sa 75 apmms@atco.com.sa 74 abbasm@anet.sa 79 sales@ati.com.sa 78 rgalloway@smith.com 77 ahc@alhejailan-consultants.com 82 info@alhajry-overseas.com.sa 81 amsari@emailsrvc.com 80 alsuwaiket@saudionl ine.com.sa 85 helpdefk@almisehal.com 84 bbanzon@al-hoty.com 83 waleed.abuzaid@ acec-sa.com 88 abssa@awalnet.net.sa 87 aqfk@sahara.com.sa 86 mike.scott@bakeratl as.com 91 jihad@amcde.com 90 ghalili@aujan.com.sa 89 oussama@frankssaudi.com 94 harbourm@camerondiv.com 93 ed.parker@bakeroilt ools.com 92 operations.rastanur a@inspectorate.com.sa 97 tariq@barwani.com 96 aharamco@hugayet.com.sa 95 anwar.ahmad@ shoaibigroup.com 100 ncmsdm@zajil.net 99 pi-consult@sps.net.sa 98 george.coutts@ weatherfordsa.com 103 summit@zajil.net 102 manadmin@sayboltsa.com 101 zomco@zamil-om.com 106 abbasm@anet.sa 105 zparabia@saudionlin e.com.sa 104  mail@acec-sa.com 109 wwd@smi.com.sa 108 recruitmentsabb@ sabb.com 107 contact@stc.com.sa 112 opmubarak@rediffmai l.com 111 ecareer@stc.com.sa 110 saudi_resume@ myway.com 115 info@hp.com.sa 114 employment@gulfbase.com 113 SaudiArabia@ baesystems.com 118 rcgc@riyadh-cables.com 117 info@saparabia.com 116 iyadfakhry@hotmail.com 121 info@mugbil.com 120 info@alfozan.com 119 jamshed@smbasuliman.com 124 ali@baasem.com 123 sales@gcspaints.com 122 cv@cv2005.worldispn etwork.com 127 edris@haj.com.sa 126 mansoork45@hotmail.com 125 careers@saudi.switzgroup.com 130 corporate_sa@ hotmail.com 129</b ufarook@alhokair.com.sa 128 jobsinmarketing2005 @rediffmail.com 133 hrjed@hotpop.com 132 sure@saudi.net.sa 131 socproject2006@ hotmail.com 136 aytb@qatar.net.qa 135 hr@allied-medical.com 134 jalal.mounayar@ gmail.com 139 rec1@alfanar.com 138 careers@almarai.com 137 aa_waseem@yahoo.com 142 jobsindammam@ gmail.com 141 hr@sfc-ksa.com 140 jobsin2006@yahoo.com 145 wahabnk@gmail.com 144 info@iics.sa.com 143 jobs@robian.com.sa 148 aztracon@tri.net.sa 147 info@infoline.com.sa 146 adartsigns@awalnet.com.sa 151 roudah@cyberia.net.sa 150 saudi.a@rediffmail.com 149 foodworld@mail.com 154 fkashkash@yahoo.com 153 hrd@robian.com.sa 152 admin@globemedsaudi.com 157 hotjob7@yahoo.com 156 ignou@ateico.net 155 financerecruitem@ yahoo.com 160 saudianfal@yahoo.com 159 info@sony.com 158 topnotchpositions@ yahoo.com 163 humres@alhamaco.com 162 hr-e@safari-e.com 161 equipmentrentaljobs inuae@yahoo.com 166 jobs_wfi@yahoo.com 165 akelco@akel.com.sa 164 sales@arabequipment est.com 169 youssef.utc@ zajil.net 168 furfab@jrec.com.sa 167 itjobs@alhokair.com.sa 172 gulfelite@hotmail.com 171 jobs@metco.com.sa 170 shayaisd@nesma.net.sa 175 purchase@epcco.com 174 ltr_c@yahoo.com 173 careersatriyadh@ yahoo.com 178 recruit@anholdings.com 177 arch@figuresgroup.com 176 baesystemsrecruitme ntext2@hr.xchanging.com 181 saudi_resume@ yahoo.com 180 info@dasmanfood.com.sa 179 Recruitment@ aljomaihbev.com 184 najmi9455@yahoo.com 183 careers@aljomaihbev.com 182 hrmanager04@ yahoo.com 187 arbsco@yahoo.com 186 TURKI_D@hotmail.com 185 al-hassan@al-babtain-himb.com 190 breem@awalnet.net.sa 189 hr@alsuroor.com 188 hrconsultant_ lbn@yahoo.com 193 info@alnafea.com.sa 192 jobs_a_m@yahoo.com 191 sisrecruitment@ alsuwaidi.com.sa 196 baziad@baziad.com 195 syed.zafer@sa.abb.com 194 recruiting@bravo-power.com.sa 199 jobs@aecl.com 198 karan@al-araj.com 197 sahaider@surebeammi ddleeast.com 202 info@al-baddad.com 201 atlasahr@hotmail.com 200 recruitment.ksa@pwclogistics.com 205 rec1@alfanar.com 204 info@saudicast.com 203 SA-Human-Resources@ sa.schneider-electric.com 208 auto_career@ yahoo.com 207 hr@alkhorayef.com 206 recruitment.services@sa. ey.com 211 admin@alkhodari.com 210 alsaidaest@zajil.net 209 recruitment@ RCJubil.gov.sa 214 info@aloula.com 213 abdulhadi@altoukhi.com 212 swedishtradecouncil @gmail.com 217 info@asasyah.com 216 astra@astra.com 215 backfillingjob@ hotmail.com 220 Atlas4hr@hotmail.com 219 jobs@badgaish.com 218 jobs2005e@yahoo.com 223 jobs@carriersaudi.com 222 scphr@saudichevron.com 221 danfoss@emirates.net.ae 226 aah1954@hotmail.com 225 estimator001@ yahoo.com 224 recruitment@ damacgroup.com 229 aly@el-zayat.com 228 batoul.ashi@ exel.com 227  asif@ipc-ksa.com 232 furfab@jrec.com.sa 231 jobs.gps@sps.net.sa 230 v_k_000@yahoo.com 235 jobs@isys.com.sa 234 edward@imc.com.sa 233 production.KSA@ gmail.com 238 CSM.KSA@gmail.com 237 pmd@pmd-co.com 236 jeddah_company@ yahoo.com 241 fax2417049@yahoo.com 240 maaden@maaden.com.sa 239 gerald.jude@ people-one.com 244 marblek6@yahoo.com 243 slhh002@motorola.com 242 jaleel@safari.com.sa 247 ifo@umg.com.sa 246 hrd@mynaghi.com.sa 245 intercol@emirates.net.ae 250 info@power-horizon.com 249 mchehab@indsci.com 248 afs@recruit.services.com.sa 253 saudihr-2006@ hotmail.com 252 employment@thuraya.com 251 jobs@integrated-telecom.com 256 info@tetratech.com.sa 255 wpccl.saudi@ wartsila.com 254 afecest@yahoo.com 259 info@zahid.com 258 aazmi@rtcc.com.sa 257 edse_otao@hotmail.com 262 z4ha@zagzoog.com 261 hrm@mscc.com.sa 260 vaslhrb@vinnellarab ia.com 265 cmhiring@gmail.com 264 JOPCV@yahoo.com 263 jobsready@gmail.com 268 hrsaudi1005@ yahoo.com 267 jobs@loyalty-inc.com 266 marketcv@yahoo.com 271 Mmujeeb_6100@ hotmail.com 270 mbmanager@alyaum.com 269 jobsht83@yahoo.com 274 jobs_250@yahoo.com 273 dynatrde@emirates.net.ae 272 jeddah987@yahoo.com 277 mangcv@yahoo.com 276 jobs@wataniaind.com 275 fooda7@hotmail.com 280 nw@mriwwuae.ae 279 hadadi.ha@pg.com 278 nizar@hugayet.com.sa 283 anaziq@ngha.med.sa 282 pcie@icc.com.sa 281 Jobsearchksa@ gmail.com 286 siec@siec.com.sa 285 ahmed@nie.com.sa 284 smalkhelaifi@ gmail.com 289 sa_careers@yahoo.com 288 yabdullah@bayanat.com.sa 287 recruiting@al-khobar.oilfield.slb.com 292 hotjob7@yahoo.com 291 info@detasad.com.sa 290 hr_510@yahoo.com 295 k.m.m.f@hotmail.com 294 aharamco@hugayet.com.sa 293 info@abedalmishal.com 298 hr2004rd@yahoo.com 297 cfo@redagroup.com 296 careers@shb.com.sa 301 iimit@sahara.com.sa 300 HR@sipchem.com 299 careers@anb.com.sa 304 Recruitment@ saib.com.sa 303 jobs@alfransi.com.sa 302  marketinginfo@ alrabie.com 307 info.petrol@ aldrees.com 306 info@jabalomar.com 305 cargo.marketing@ flybmi.com 310 z.fallatah@alahli.com 309 recruitment@ marafiq.com.sa 308 apply@overseasoiljo bs.com 313 sdgc@sps.net.sa 312 Humanresource@ sro.org.sa 311 liezhel@ccmrecruitm ent.com 316 idbarchives@ isdb.org.sa 315 privacy@kpmg.com 314 career_path_ saudiarabia@ yahoo.com 319 f.taha@biosaline.org.ae 318 kas@axiomtelecom.com 317 jeddah_company@ yahoo.com 322 adahi@isdb.org.sa 321 jobs.si@intercol.com 320 irasheed2006@ yahoo.com 325 info@alahli.com 324 saudicv@dalmaenergy.com 323 jobs2005_cv@ yahoo.com 328 info@herfy.com 327 info@ttcoman.com 326 info@zate.com.sa 331 info@sasref.com.sa 330 jobs.riyadh@ yahoo.com 329 recruitsksa@ yahoo.com 334 expocareer@gmail.com 333 uitc2006@yahoo.com 332 efira_1@yahoo.com 337 hr@alhussan.edu.sa 336 arabia@typsa.es 335 callcenter@mobily.com.sa 340 al3jmi@gmail.com 339 dhcl_projects@ yahoo.com 338 farranoussama@ yahoo.com 343 hrryd@hotmail.com 342 moussa@cmci-sa.com 341 minhajroma@hotmail.com 346 lock777@gmail.com 345 career@giordano.com.sa 344 nassan0a0@yahoo.com 349 marblek6@yahoo.com 348 emd@alharbi.com.sa 347 m0306@jobsincompany.com 352 menahr@gmail.com 351 imad@pilogksa.com 350 kmasrouha@aaltaher.com 355 areel@otaishan.com.sa 354 info@cellucom.com 353   info@detasad.com.sa 358 kuthb@brainlease.com 357 salam@atc.com.sa 356 anand@darinfotech.com 361 sdjobs@sps.net.sa 360 jobsfd@spgsteel.com 359 hazzaa.moahmmad@ aramco.com 364 recruitment@ almarai.com 363 saudi_resume@ myway.com 362 pilotrecruitment@ airarabia.com 367 careers@gmail.com 366 hr@jatco.com.sa 365 linkindiagcc@ yahoo.com 370 tingdh@gmail.com 369 hrsaudi@jatco.com.sa 368 reservations2@ holidayautos.com.sa 373 kfmc@kfmc.med.sa 372 nizar@hugayet.com.sa 371 hrconsultant_ lbn@yahoo.com 376 info@mercan.com 375 buddyvillas@ al-hoty.com 374 admin.dpt@arabianbe mco.com 379 kfshdm@gmail.com 378 aasfoor@kwsal.com 377 sbahchr@humanitaria ncity.org.sa 382 info@nafkal.com 381 ampo@ampo.com.sa 380 kevin.bell@internat ionalpaint.com 385 info-cv@hotmail.com 384 cv.candidate@ yahoo.com 383 info@sails.net 388 shifajed@hotmail.com 387 dpt@arabianbemco.com 386 mustafa.khamees@ aramco.com 391 jobs@kfmc.med.sa 390 alrashidf@rsal.com 389 bijui@hakgroup.com 394 consult@masorg.com 393 m.khodair@itm.com.sa 392 omatrajed@saudionli ne.com.sa 397 it_recruitment@ airarabia.com 396 recruitment@ airarabia.com 395 marblek6@yahoo.com 400 careershr2006@ gmail.com 399 hr@alkhorayef.com 398 turki@safari.com.sa 403 hrms_info@yahoo.com 402 idris.slc@eajb.com.sa 401 n_somarajan@ yahoo.com 406 gdcjed@yahoo.com 405 jobs_wfi@yahoo.com 404 myqassem@hotmail.com 409 info@msargroup.com 408 hr@daleelteq.com 407 fishingksa@gmail.com 412 tuttimango@sps.net.sa 411 acbi-career@ cbi.com 410 jciservices@ yahoo.com 415 salaliw@yahoo.com 414 job_cv_email@ yahoo.com 413 itjobs@kojamjoom.com 418 hrd@ermatc.com 417 resume@al-khaleej.net 416 personnelksa@ gmail.com 421 rcgc@riyadh-cables.com 420 jobs@metco.com.sa 419 executive@soukscons ulting.com 424 fastrecruitment@ hotmail.com 423 ksajob06@yahoo.com 422 info@qecons.com 427 saudi_job_app@ yahoo.com 426 light2005-jobs@ yahoo.com 425 alwassel@anet.net.sa 430 scphr@saudichevron.com 429 hr@nasaviation.com 

Engineering study at El Shorouk Academy in Egypt

El Shorouk Academy is a private an educational academy located in El Shorouk city, Cairo, Egypt; it offers study programs in engineering {Electrical Department, Chemical Engineering Department, Civil Engineering Department, Bio-medical Engineering Department, Architect Department, Communication Engineering Department.} as well as business administration, information systems, Mass Communication and computer science. The Academy consists of six buildings, in addition to a separate mosque, two cafeterias, and two major libraries.

IEC 60364-3 Electrical Installations of Buildings

60364-3 Electrical Installations of Buildings
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SF6 gas (Part 1)

• Since 1960, SF6 has been used as arc quenching and insulating medium for high and medium voltage switchgear systems. The favourable electrotechnical, chemical and physical characteristics of the gas have considerably influenced the development of the switchgear technology. SF6 is an alternative to other conventional insulating and quenching media such as e.g. oil, and air. The use of SF6 gas considerably increases, in some applications, the efficient utilisation of resources in energy transmission and distribution with respect to technology, finances and personnel [1]. At the same time SF6 in comparison to oil reduces the risk of hazard (e.g. fire, explosion) to personnel and environment. An overall evaluation considering all ecological, economic, safety and technological aspects has proven that SF6 is still an excellent choice as insulating medium [2]. The existing SF6 technology in the field of energy transmission and

The Gas Insulated Switchgear (GIS)

·         The Gas Insulated Switchgear (GIS) shall be a complete unit comprised of main equipment, all control, monitoring, protection, measuring and auxiliary devices and systems including interconnections, all termination

·         Joints at interfaces, mechanical linkages, couplings, SF6 gas piping, cabling, wiring, grounding materials etc. required for proper and satisfactory operation.
·         The GIS shall be of compact and modular design with individual equipment modules connected together to form a complete assembly. However, combined disconnect switch and grounding switch, cable termination, PT, exit bus duct and CT (with cores located within gas compartment) shall be in separate gas tight compartment. If, CT is installed in breaker gas compartment; insulation class for CT shall be class F. of either single-phase enclosure type or three-phase enclosure type for voltage levels of 230kV and below. of single-phase enclosure type for voltage level of 380kV. Installed on suitable pads or supporting frames/structures with provision for leveling, including fasteners to foundation, which shall also be included in the supply. Support-structures shall be designed and fabricated to withstand the short circuit forces of the ground fault current.
·         GIS shall having expansion joints and flexible connections, where several enclosures are connected in the longitudinal direction, such as main bus. Expansion joints provided for installation alignment shall be locked in place when alignment is complete. Expansion joints for compensation of thermal expansion and erection tolerances shall have     the means to preserve mechanical integrity of the enclosure and the plug-in contacts for the conductor. Provided with galleries, stairways, movable platform or walkways for accessing the equipment above two meters for maintenance and operation.
·          All structures, movable platform, galleries, stairways and walkways shall have grounding provision and shall conform to the relevant Occupational Safety and Health Administration (OSHA) regulations.
·         For single-phase type GIS, creation of single gas zone by external piping connection between the phases is not acceptable. Also, external piping connection (with normally open valve) to create common gas zone (between same phase) in single-phase type GIS is not acceptable.
·         The GIS enclosure shall be safe to touch and fully ensure operational security and personnel safety under all normal and fault conditions with the maximum allowed induced voltage in the enclosure of 65 volts.
·         The switchgear and all its components and accessories shall be designed for minimum maintenance during service. The manufacturer shall state the minimum interval between minor inspections (which will be restricted to visual checking and adjustments of external parts only) and major inspection/overhaul, including refilling or replenishment of gas and cleaning of the contaminant or filter in the circuit breaker chamber(s).
·         Suitable openings shall be provided in the circuit breaker, disconnect and grounding switch modules for major inspection/adjustments.
·         All motors shall be in accordance with IEC 60034. The bearings and other such parts shall be permanently lubricated for the entire service life. Padlocks shall be made of stainless steel or brass.
·         The GIS interface points shall be carefully coordinated with other equipment such as overhead lines, cables, transformers, reactors, capacitor banks, etc., supplied by other manufacturers in order to ensure full compatibility. The design criteria for outdoor portion of the GIS bus duct leading to SF6-to-Air Overhead Line Termination / SF6-to-Oil Transformer Termination shall be as mentioned in clause 4.2.2 and in the data schedule.
·         All modules of the switchgear and components of the same rating and construction, which may need to be replaced, shall be strictly interchangeable.
·         To facilitate transport and handling, lifting eyes or other suitable attachments shall be provided with each GIS module.
·         Each module of switchgear, consisting of individual elements intended to be directly connected together, shall be constructed as a transportable assembly suitable for shipping and transportation without being dismantled.
·         All new gaskets, sealants and desiccants for permanent sealing of all field joints and all access covers, removed during assembly, shall also be provided.
·         The GIS shall be designed per IEC 62271-203 or ANSI/IEEE C37.122 standard. The enclosure shall be capable of sustaining without damage all mechanical, electrical and thermal shocks that may occur in service during normal and fault conditions, including pressure effects of internal fault arc current of specified short circuit level and time. The enclosure assembly, material and design shall be such as to minimize induced electrical losses and heating effects which could occur in service under normal and fault conditions.
·         Joints and couplings between dissimilar metals shall be avoided to prevent galvanic corrosion.
·         All supporting steel work shall be hot-dip galvanized
·         A partition separating a compartment filled with insulating gas from a neighboring compartment such as a cable box, filled with liquid, shall not show any leakage affecting the dielectric properties of the two media.
·         All welding in GIS shall conform to Section IX of ASME code or equivalent. The number of welds shall be kept to a minimum. At least 10% of all welds must be subject to non-destructive testing by X-ray or ultrasound and all records of these must be made available.
·         The construction and thickness of the GIS enclosure and air storage tank of the pneumatic operating mechanism shall conform to ANSI/ASME Boiler and Pressure Vessel Code, and ANSI/ASME B31.1 or equivalent.
·         All current carrying parts shall be made of electrolytic grade copper or aluminum alloy. All interconnecting sections of current transferring parts shall be silver-plated.
·         All piping for SF6 gas, hydraulic and pneumatic operating mechanism including their fittings shall be made of copper, brass or stainless steel.
·         All external connectors and terminal pads shall be made of copper or aluminum with tin-plating and designed per NEMA CC1 and NEMA CC3. Terminal pads shall have 4 holes.
·         Rated interrupting current of the auxiliary contacts shall be not less than 10Adc.
·         The specific ratings of the GIS equipment shall be as specified in the data schedule.
·         The switchgear shall be capable of carrying the specified rated current continuously at the design ambient and specified ambient conditions  without temperature rise of various parts exceeding the limits stated in IEC 60694 or equivalent ANSI standards. The maximum
·         All equipment and components of the switchgear including bus support insulators shall be free of partial discharges when operated at the rated voltage. The partial discharge intensity at ll0% rated voltage shall not exceed 10 pC with a maximum background level of 5pC.
·         Future alterations and extensions can be undertaken in either direction by GIS manufacturers other than the original manufacturer.
·         Maintenance or removal of a disconnect switch or circuit breaker will not involve removal from service of adjacent disconnect switch or main bus sections.
·         Separate GIS bus link module shall be provided at both ends of the GIS to avoid modification of the existing bus for future extension of the GIS buses by GIS manufacturers other than the original manufacturer.
·         Adequate clearances around GIS shall allow free movement of SF6 gas service cart.
·         Two maintenance grounding switches shall be provided across each circuit breaker to measure the contact resistances of circuit breaker at site.
·         Sufficient clearances around bushing for cable HV AC testing shall be provided.
Adequate facilities shall be made available for neat storage of HV AC cable-test bushing in the substation