1 - Control voltage will be ( 220 ) VDC , ( 110 ) VDC .2- The delivery period of equipment will be as follows :- 50% of the equipment and necessary tools and equipment for ( installation ,maintenance , and replacement ). within six months from the starting order .- 50% of the equipment and spare parts within nine months from the starting
order .3- The ( 20 ) Kv cubicles are available in PEDE's sites,the required C.B.s shall becompatible with the ( 20 ) kV cubicles in which the required C.B.s shall be installed
without any modification in the cubicles  .It is the responsibility of the bidder to ensure the compatibility , keeping theclearances and dielectric strength according to relevant IEC standards and thisspecification .4- The Succesfull bidder should visit some PEDE's 66/20 Kv substations with
concerned PEDE engineers and take the necessary data and measurements of
every type of the C.B.s and also the related 20 Kv cubicles on site, in order to
ascertain that his proposed C.B.s fit these cubicles .
In additon to that the successful bidder should take the components of the
electrical connection jack which provides the feeding to the circuit breaker ,
signals and contacts of the control circuit.