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Normally where thte insulation of Cable is mentioned,a maximum operating class is defined like 600/1000V.What do 1000 signify in this statemnet.?

Do we need to block Auto reclosing when eitherSoTF or Stub protection operated if yes why?

if i have a coli of 242kW on a 110V Dc system...how much current is require to energize the coil?...i think a current of 2.2A would energize the cirucit....

Normally we bypass synch check in single pole auto reclosing..

why synch check is bypass in single pole auto reclosing?

what will the ideal location of high voltage compononet(circuit breaker,isolator ,current transformer and voltage trasnformer). some times curent transformer are placed before circuit breaker and sometimes after CB.. Is there any rule for positioning high voltage component??

In case when line is energize but bus is dead..whether synch check will be completed with dead bus and live line ? Do CB closes in this condition?

Thanks all for yr valuable coments.. but i m still confused that why dc require much greater contact separtion?how can u achive by connecting CB contacts in series?

in what situation do we use three pole CB for DC?

what is the criteria of selecting 3 phase motor over 1 phase?