Electrical construction/bza: provision of temporary un-interrupted power supply arrangements with dg sets including lighting arrangements, air coolers, fans, shamianas and chairs etc. in connection with pre-ni/ni working of gala-mbd &amp ryp-vnc sections of vijayawada bye pass line between mbd-ryp (ror) project, bey-pnm &amp pnm-ndl sections of gnt-gtl doubling with electrification project and pndp-kmt &amp kmt-dkj sections of new bg third line with electrification between vijayawada - kaz