Answer / jaswant rajawat

Bus earthing truck is use to earth bus bars of switchboard
at the time of maintenance of bus bars. For this we have to
remove incomer breaker panel and insert bus earthing truck
so that bus bars will remain earthed during maintenance.

Cable earthing truck is use to earth incoming cable or
outgoing feeder cable in switchboard during maintenance at
transformer end or motor terminal box.

Answer / bala.a

for saftey point of view and reduced to time for providing
Individual earthing system.

Answer / sounak chatterjee

In transmission and distribution lines the flow of of power depends upon mode of operation.There are two ways ,one from importing power from grid system,and the other one is exporting power to grid. There are certain switchboards whose sole application is to deliver power from system and as well as importing power from the system. In case of only importing only bus side earthing truck will suffice the purpose but in case of dual operation cable side earthing truck too are required.Since flow of power also from downstream to upstream any recurrence of negative feedback will get diminished by the use of cable side earthing truck.

Answer / arumugam

Bus earth is also called plate earth. It is using when the
motor KW is higher for example above 20 KW. Incase of any
short circuit in the motor the earth will takes place the
short circuit to earth for protect

Cable earth is using when the Motor KW is below the 20KW.

Answer / arumugam

Bus earth is also called plate earth. It is using when the
motor KW is higher for example above 20 KW. Incase of any
short circuit in the motor the earth will takes place the
short circuit to earth for protect

Cable earth is using when the Motor KW is below the 20KW.

Why we have short circuit the secondary of the transformer

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