13 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works   Transformer section with power transformer(s),   Low voltage section,   Earthing system.  Power transformers shall be constructed for installation on a concrete foundation. The latter shall be constructed  with an internal collecting pit for insulating fluid (oil) from the transformer. The pit shall be filled with stones  of suitable size. The pit shall have sufficient capacity to contain all the insulating fluid of the transformer.  The layout of the station shall allow for easy access to equipment inside the station. Further, easy replacement  shall be allowed, in particular replacement of the transformers.  Protection equipment, control switches and indicating instruments for the high voltage switchgear and  transformer station shall be installed in a dedicated control panel. Connectors at all panels shall be numbered.  The high voltage equipment shall be rated for continuous operation with maximum load of the distribution  transformers and the present fault level as calculated by the Contractor.  All materials shall be "ready made" and prepared for easy site installation with a minimum of work required  onsite.  All components shall be manufactured from a modified, cross-linked, polyolefin-based, heat shrinkable product  manufactured from a semi-rigid compound. The dimensions of the product shall reduce a predetermined size  upon application of heat in excess of 125ºC.  The materials shall have the following properties:   A tensile strength of 170 kg/cm$^{2}$, the ultimate elongation shall not be less than 350 percent and the high  temperature ultimate elongation shall not be less than 400 percent. After subjection to thermal ageing at  150+2ºC for 168 hours, the tensile strength shall not be less than 140 kg/cm$^{2}$ and the ultimate elongation  shall not be less than 300 percent. The tests shall be in accordance with BS 2782.   The electric strength of the material shall not be less than120 kV/cm.   The material shall have a continuous operating temperature of 120ºC.   The material shall have water absorption of less than 0.1 percent in accordance with the test requirements of  BS 2782.   All parts which are required to be resistant to ingress of moisture shall be coated with an adhesive which  will operate satisfactorily under the conditions of direct sunlight, temperature and humidity and in  particular, shall exhibit the following properties.   The adhesive shall have a viscosity of 250 ± 40 poise at 160ºC when tested in accordance with ASTM D  1084 Method B, Shear 5, or P.   The adhesive shall have a softening point of 120 ± 10ºC when tested in accordance with ASTM E 28.   The adhesive shall have a peel strength to PVC of 13 kg/25 mm width when tested on a rotating mandrel.   The adhesive shall have a shear strength of not less than 35 kg/cm at 23 + 2ºC on aluminium/aluminium  after heating at 150ºC for 20 minutes.  8.5.2 Power circuit breakers and disconnectors  HV switchgear unit should be same, as followed table.Tenderer should take the required information (voltage  and current, minimum and maximum peak values of voltage and current) from local electricity authority during  Tender Stage.  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc 