55 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  PVC power cables shall comply with IEC 60227, 60228, and 60245, and must not be less than 1,5 mm² cross  section. Generally, PVC power cables are to comprise stranded copper conductors with an extruded PVC  insulation, laid-up in an extruded PVC bedding with PVC oversheath. Where mechanical protection is required  cables may be placed in metal conduits or be provided with armouring depending on the installation.  XLPE power cables shall comply with IEC 60228 and IEC 60502, and must not have less than 1,5 mm² cross  section. Generally, XLPE power cables are to comprise stranded copper conductors with an extruded XLPE  insulation, laid-up in an extruded bedding, galvanised steel wire armouring and an extruded PVC oversheath.  Selection of all the cables and capacity decreasing factors will be determined according to the items below:  a) Environment and ground temperature  b) Specific thermal resistance of the soil  c) Cable depth O.G. 0.8 meter  d) Cable depth A.G. 0.8 meter  Following factors will be taken into consideration in order to determine required capacity and width section for  each cable:  a) Short-circuit current  b) Environment temperature conditions  c) Installation of the cables inside air, channel or soil  For power circuits minimum 1.5 mm$^{2}$, cables with appropriate section for electronic equipment will be chosen.  8.15.1.1 MV Cables  MV Cables will be laid as one core and a spare core will always be provided.  According to TEDAŞ standard, cable diameter should be at least 95 mm$^{2}$ XLPE.  High voltage connections between transformer stations shall be for 34.5 kV. 20.3/35 kV cross-linked  polyethylene (XLPE) cable will be manufactured in compliance with TSE and it will have bunched copper  conductors, XLPE insulated cores, shielded sealed insulation mount, one galvanised steel wired sheath (and/or  protected chemically against rodents) and finally on top a PVC mount. By conforming to all other requirements  and corrections of TS 1618 and by taking into consideration physical and chemical features of the PVC mount,  red coloured PVC must be chosen. In cable connection; proper cable termination accessories and materials shall  be used.  PVC mount will comply with TS 1618 requirements, will keep its adhesiveness to the sheath wires and bedding  and following long-lasting storage process, during direct sunlight exposure of the cable system, it will not be  softened to be deformed or torn apart.  Also, in the condition where the line between the power generation point and the facility is aerial line, a  conductor with appropriate cross-section and steel core aluminium in compliance with TSE and related  international standards will be chosen and installation conforming to TEDAS Specifications will be performed.  Generally, low voltage power cables shall be 600/1000 V grade.  Cable sizes, types and construction must be chosen with due regard to the connected equipment requirements,  ambient conditions, installation method, and fault and over currents. Generally, the cable manufacturer's  published data are to be used in determining cable adequacy.  8.15.1.2 LV Cables  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc 