54 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  General junction boxes are to be constructed of aluminium complete with lid and captive gasket to a degree of  IP 65. The necessary number and size of entries together with terminals are to be designed according to circuit  requirements. General junction boxes shall be suitable for direct mounting with external fixing holes, and are to  be labelled with reference number.  Power connection will be made between MCC boards and local boards. Signal cable will be connected directly.  Terminal box will be IP65 and aluminum in submersible pumps and pump power and signal cables will be  connected in same terminal box.  8.12 Junction Boxes  8.13 Cable Entries  8.15 Cables  8.14 Cable Glands  8.15.1 Power cables  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  • PVC for internal building.  • Cross-linked-polyethylene (XLPE) for all other locations.  Power cables shall generally consist of two types:  Power cables shall be selected such that the voltage drop does not exceed the maximum value defined in IEC  60364 at any point in the installation.  Cable sizes, types and construction must be chosen with due regard to the connected equipment requirements,  ambient conditions, installation method, and fault and overcurrents. Generally, the cable manufacturer's  published data are to be used in determining cable adequacy.  All cables used in the plant shall be of stranded type and shall have necessary protection against rodents. Power cables are cables having operating range U  50 V. Signal cables are cables having operating range U<50  V  All cable glands are to be of the compression type acting upon the cable sheath and where necessary provided  with stockings, which grip the cable. All cable glands are to be of corrosion resistant metal or plastic cable  glands will be accepted if it is not original accessory of provided equipment. Cable glands are to be of a type,  which will not reduce the degree of tightness of an enclosure, and are to be correctly sized to the cable they  seal.  Each mounting frame shall be embedded in walls.  The cable penetration system shall comprise a steel-mounting frame packed with insert blocks to accommodate  the cables and to fill out surplus room. After cable installation the insert blocks shall be compressed to complete  the sealing.  Cable entries from one room to another or from outside to inside shall be performed by watertight and fireproof  multi cable penetration seals to provide an efficient barrier against fire, smoke, flooding and vermin. Terminals are to be arranged at different heights for different services and a barrier is to be provided to shield  instrument circuits from power circuits at different voltages. Terminals are to be of the necessary number and  size (20 % spare) and determined according to respective circuit requirements. 