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Dhofar Power Company SAOGMott MacDonald

Contract drawings for insulator and conductor fittings shall in addition to the dimensions, show materialtypes and grades, protective treatment and any other peliinent information. Paliicular attention shall bepaid to those dimensions which involve inter-changeability, con-ect assembly and those for which gaugesare specified. Contract drawings shall be submitted to the Owner/Engineer.Fittings shall be free from sharp edges, burrs and swarf and particular attention shall be paid to insularprotective devices to prevent corona in service. The faces of flat faced fittings shall be sufficientlyparallel and flat to provide a suitable contact service and remain so after fabrication.The mouth of all trunnion clamps shall be free of sharp radii of curvature, ridges or other irregularitieswhich could lead to localised pressure or damage to the conductors, or separation of the individualstrands.The contact surface of all bolted palm joints shall be scratch brushed or rough machined. In addition,care shall be taken to remove any surface contaminates prior to packing, other than material specificallyintroduced as a protective measure.Ball end fittings shall be free from cracks, surface flaws laminations and other defects.For factory formed helical fittings the individual rods or sub-sets of rods making up each fitting shall betied or taped together.All insulator and conductor fittings shall be marked to ensure a system of traceability. Corona freemarkings shall be in accordance with the requirements ofl 61284.In the case of factory formed helical fittings the information required above shall be provided on tear-offlabels, additionally they shall be marked with paint (to an agreed colour code) either at the cross-overpoint or at the centre of the fitting.Installation torque values shall be stated in Newton-metres (Nm), and for compression die sizes theInetric across flats dimension of the die (e.g. 40.21) shall be used.Non-metallic materials used shall:1 Have good resistance to ageing2 Be capable ofwithstanding service temperatures without detrimental change of properties3 Have adequate resistance to the effects of nitrogen oxides, ozone, ultra violet radiation and air

pollution over the range of service temperatures.9 Corrosion ProtectionAll materials used in the manufacture of insulator and conductor fittings shall be inherently resistant toatmospheric con os ion which could affect their performance.All ferrous materials, shall either be inherently resistant to atmospheric corrosion, or be suitablyprotected against con-osion that can occur during transportation, storage or service. All fen-ous partswhich will be exposed to the atmosphere in service, except those made of the appropriate grade ofstainless steel, shall be protected by hot dip galvanising in accordance with the requirelnents of BS ENISO 1461. Zinc thickness on forged components shall not be less than 8 microns.All external threads shall be cut or rolled before hot-dipped galvanising. Nuts to be galvanised shall besubsequently tapped 0.4 mm oversize and the threads oiled.The rough machined contact surfaces of partial tension clamps and line termination fittings shall beprotected with a removable dry weatherproofcoating after manufacture.

Construction of 132kVOverhead line between Awqad GSS SFZ GSS Rev. No. and Associated Works Package-1Volume 2 Overhead Line Specification Date : December 2010Section 09 Insulator and Conductor Fittings Page :Page 7 of 16

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