How much costly in percentage wise is sandwich busduct costly than air insulated busduct of any rating?

What type of wiring series or parallel is used for conventional and addressable type FAS & why?

Why do we pefer VCB over OCB?What are the advantages of VCB over OCB?

CEB,

if two transformers are placed parallel & both have fault impedance of 50KA will it increase or decrease show example?

How many points does a Circuit can have?

if two transformers are parallel & both have fault short ckt. impedance of 50KA in each case will it increase or decrease show example?

How many points can we have in AC Circuit? Show by giving suitable example?

What is the major differences between RCCB & ELCB? If we use ELCB of less sensitivity why does it trip often and can we control it from tripping?

If two Transformers are connected in parallel having impedance of 50KA in both transformers will the impedance increase or decrease after connecting transformers in parallel?

Posco,

What is the formula for calculating impedance of transformers connected parallel at fault level 50KA?

How Can we calculate the rating of a cable?Show the formula?

Jindal,

why do we prefer VCB over OCB? what are the advantages of Vaccum Ckt. Breaker over Oil Ckt. Breaker?

What is the standard height of installation of Socket & switch from Finish Floor Level as per the IEC/IS Rules?

How can we save theft of wire after finishing of wiring work, plz suggest another answer other than security or supervisor's work?

What are differences between Conventional & Addressable type smoke detectors?